2004-11-03 13:51:07 +00:00
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.\" Copyright 1993 Giorgio Ciucci (giorgio@crcc.it)
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2007-09-20 06:52:22 +00:00
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.\" and Copyright 2004, 2005 Michael Kerrisk <mtk.manpages@gmail.com>
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2004-11-03 13:51:07 +00:00
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.\"
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intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: s/LICENSE_START(verbatim)/LICENSE_START(VERBATIM)/
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:29:01 +00:00
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.\" %%%LICENSE_START(VERBATIM)
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2004-11-03 13:51:07 +00:00
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: Global fix: Add LICENSE_START(verbatim)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:40 +00:00
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.\" %%%LICENSE_END
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2004-11-03 13:51:07 +00:00
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.\"
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.\" Modified Tue Oct 22 17:53:56 1996 by Eric S. Raymond <esr@thyrsus.com>
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.\" Modified Fri Jun 19 10:59:15 1998 by Andries Brouwer <aeb@cwi.nl>
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.\" Modified Sun Feb 18 01:59:29 2001 by Andries Brouwer <aeb@cwi.nl>
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2007-09-20 06:52:22 +00:00
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.\" Modified 20 Dec 2001, Michael Kerrisk <mtk.manpages@gmail.com>
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2004-11-03 13:51:07 +00:00
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.\" Modified 21 Dec 2001, aeb
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2007-09-20 06:52:22 +00:00
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.\" Modified 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
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2004-11-03 13:51:07 +00:00
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.\" Added notes on CAP_IPC_OWNER requirement
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2007-09-20 06:52:22 +00:00
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.\" Modified 17 Jun 2004, Michael Kerrisk <mtk.manpages@gmail.com>
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2004-11-03 13:51:07 +00:00
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.\" Added notes on CAP_SYS_ADMIN requirement for IPC_SET and IPC_RMID
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2007-09-20 06:52:22 +00:00
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.\" Modified, 11 Nov 2004, Michael Kerrisk <mtk.manpages@gmail.com>
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2004-11-10 17:27:07 +00:00
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.\" Language and formatting clean-ups
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.\" Rewrote semun text
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.\" Added semid_ds and ipc_perm structure definitions
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2005-08-02 12:09:40 +00:00
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.\" 2005-08-02, mtk: Added IPC_INFO, SEM_INFO, SEM_STAT descriptions.
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2004-11-03 13:51:07 +00:00
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.\"
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2013-06-03 16:44:45 +00:00
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.TH SEMCTL 2 2013-06-03 "Linux" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2013-03-18 11:59:24 +00:00
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semctl \- System V semaphore control operations
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.nf
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.B #include <sys/types.h>
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.B #include <sys/ipc.h>
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.B #include <sys/sem.h>
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.sp
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.BI "int semctl(int " semid ", int " semnum ", int " cmd ", ...);"
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.fi
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.SH DESCRIPTION
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2004-12-13 08:39:28 +00:00
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.BR semctl ()
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2004-11-03 13:51:07 +00:00
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performs the control operation specified by
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.I cmd
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2013-03-18 11:59:24 +00:00
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on the System V semaphore set identified by
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2004-11-03 13:51:07 +00:00
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.IR semid ,
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or on the
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.IR semnum -th
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semaphore of that set.
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2004-11-10 17:27:07 +00:00
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(The semaphores in a set are numbered starting at 0.)
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
2004-11-10 17:27:07 +00:00
|
|
|
This function has three or four arguments, depending on
|
|
|
|
.IR cmd .
|
|
|
|
When there are four, the fourth has the type
|
|
|
|
.IR "union semun" .
|
|
|
|
The \fIcalling program\fP must define this union as follows:
|
2004-11-03 13:51:07 +00:00
|
|
|
|
|
|
|
.nf
|
2004-11-10 17:27:07 +00:00
|
|
|
.in +4n
|
2004-11-03 13:51:07 +00:00
|
|
|
union semun {
|
2004-11-10 17:27:07 +00:00
|
|
|
int val; /* Value for SETVAL */
|
|
|
|
struct semid_ds *buf; /* Buffer for IPC_STAT, IPC_SET */
|
|
|
|
unsigned short *array; /* Array for GETALL, SETALL */
|
2007-04-12 22:42:49 +00:00
|
|
|
struct seminfo *__buf; /* Buffer for IPC_INFO
|
2007-12-25 21:28:09 +00:00
|
|
|
(Linux-specific) */
|
2004-11-03 13:51:07 +00:00
|
|
|
};
|
2007-12-19 06:57:44 +00:00
|
|
|
.in
|
2004-11-03 13:51:07 +00:00
|
|
|
.fi
|
|
|
|
.PP
|
2004-11-10 17:27:07 +00:00
|
|
|
The
|
|
|
|
.I semid_ds
|
2007-06-20 21:53:34 +00:00
|
|
|
data structure is defined in \fI<sys/sem.h>\fP as follows:
|
2004-11-10 17:27:07 +00:00
|
|
|
.nf
|
|
|
|
.in +4n
|
|
|
|
|
|
|
|
struct semid_ds {
|
2007-10-03 06:20:17 +00:00
|
|
|
struct ipc_perm sem_perm; /* Ownership and permissions */
|
2004-11-10 17:27:07 +00:00
|
|
|
time_t sem_otime; /* Last semop time */
|
|
|
|
time_t sem_ctime; /* Last change time */
|
2013-06-03 16:44:45 +00:00
|
|
|
unsigned long sem_nsems; /* No. of semaphores in set */
|
2004-11-10 17:27:07 +00:00
|
|
|
};
|
2007-12-19 06:57:44 +00:00
|
|
|
.in
|
2004-11-10 17:27:07 +00:00
|
|
|
.fi
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I ipc_perm
|
2012-05-31 12:31:57 +00:00
|
|
|
structure is defined as follows
|
2004-11-10 17:27:07 +00:00
|
|
|
(the highlighted fields are settable using
|
|
|
|
.BR IPC_SET ):
|
|
|
|
.PP
|
|
|
|
.nf
|
|
|
|
.in +4n
|
|
|
|
struct ipc_perm {
|
2008-08-06 20:22:46 +00:00
|
|
|
key_t __key; /* Key supplied to semget(2) */
|
2008-08-06 20:20:52 +00:00
|
|
|
uid_t \fBuid\fP; /* Effective UID of owner */
|
|
|
|
gid_t \fBgid\fP; /* Effective GID of owner */
|
|
|
|
uid_t cuid; /* Effective UID of creator */
|
|
|
|
gid_t cgid; /* Effective GID of creator */
|
2004-11-10 17:27:07 +00:00
|
|
|
unsigned short \fBmode\fP; /* Permissions */
|
2008-08-06 20:22:46 +00:00
|
|
|
unsigned short __seq; /* Sequence number */
|
2004-11-10 17:27:07 +00:00
|
|
|
};
|
2007-12-19 06:57:44 +00:00
|
|
|
.in
|
2004-11-10 17:27:07 +00:00
|
|
|
.fi
|
|
|
|
.PP
|
|
|
|
Valid values for
|
2004-11-03 13:51:07 +00:00
|
|
|
.I cmd
|
|
|
|
are:
|
2008-08-06 20:41:47 +00:00
|
|
|
.TP 10
|
2004-11-03 13:51:07 +00:00
|
|
|
.B IPC_STAT
|
2004-11-10 17:27:07 +00:00
|
|
|
Copy information from the kernel data structure associated with
|
|
|
|
.I semid
|
|
|
|
into the
|
|
|
|
.I semid_ds
|
|
|
|
structure pointed to by
|
|
|
|
.IR arg.buf .
|
2004-11-03 13:51:07 +00:00
|
|
|
The argument
|
|
|
|
.I semnum
|
|
|
|
is ignored.
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B IPC_SET
|
|
|
|
Write the values of some members of the
|
2004-11-10 17:27:07 +00:00
|
|
|
.I semid_ds
|
2004-11-03 13:51:07 +00:00
|
|
|
structure pointed to by
|
2004-11-10 17:27:07 +00:00
|
|
|
.I arg.buf
|
|
|
|
to the kernel data structure associated with this semaphore set,
|
|
|
|
updating also its
|
|
|
|
.I sem_ctime
|
2004-11-03 13:51:07 +00:00
|
|
|
member.
|
2007-04-12 22:42:49 +00:00
|
|
|
The following members of the structure are updated:
|
2004-11-10 17:27:07 +00:00
|
|
|
.IR sem_perm.uid ,
|
|
|
|
.IR sem_perm.gid ,
|
|
|
|
and (the least significant 9 bits of)
|
|
|
|
.IR sem_perm.mode .
|
|
|
|
The effective UID of the calling process must match the owner
|
|
|
|
.RI ( sem_perm.uid )
|
2007-04-12 22:42:49 +00:00
|
|
|
or creator
|
2004-11-10 17:27:07 +00:00
|
|
|
.RI ( sem_perm.cuid )
|
|
|
|
of the semaphore set, or the caller must be privileged.
|
2004-11-03 13:51:07 +00:00
|
|
|
The argument
|
|
|
|
.I semnum
|
|
|
|
is ignored.
|
|
|
|
.TP
|
|
|
|
.B IPC_RMID
|
2004-11-10 17:27:07 +00:00
|
|
|
Immediately remove the semaphore set,
|
|
|
|
awakening all processes blocked in
|
2007-05-11 23:07:02 +00:00
|
|
|
.BR semop (2)
|
2004-11-10 17:27:07 +00:00
|
|
|
calls on the set (with an error return and
|
|
|
|
.I errno
|
2004-11-03 13:51:07 +00:00
|
|
|
set to
|
|
|
|
.BR EIDRM ).
|
2005-07-18 16:13:49 +00:00
|
|
|
The effective user ID of the calling process must
|
2004-12-13 08:39:28 +00:00
|
|
|
match the creator or owner of the semaphore set,
|
|
|
|
or the caller must be privileged.
|
2004-11-03 13:51:07 +00:00
|
|
|
The argument
|
|
|
|
.I semnum
|
|
|
|
is ignored.
|
|
|
|
.TP
|
2007-12-25 21:28:09 +00:00
|
|
|
.BR IPC_INFO " (Linux-specific)"
|
2007-04-12 22:42:49 +00:00
|
|
|
Returns information about system-wide semaphore limits and
|
2005-08-02 12:09:40 +00:00
|
|
|
parameters in the structure pointed to by
|
|
|
|
.IR arg.__buf .
|
|
|
|
This structure is of type
|
|
|
|
.IR seminfo ,
|
|
|
|
defined in
|
|
|
|
.I <sys/sem.h>
|
2007-06-22 17:16:20 +00:00
|
|
|
if the
|
2007-09-20 16:26:31 +00:00
|
|
|
.B _GNU_SOURCE
|
2007-06-22 17:16:20 +00:00
|
|
|
feature test macro is defined:
|
2005-08-02 12:09:40 +00:00
|
|
|
.nf
|
2007-12-19 06:57:44 +00:00
|
|
|
.in +4n
|
2005-08-02 12:09:40 +00:00
|
|
|
|
|
|
|
struct seminfo {
|
2008-05-20 21:20:07 +00:00
|
|
|
int semmap; /* Number of entries in semaphore
|
|
|
|
map; unused within kernel */
|
|
|
|
int semmni; /* Maximum number of semaphore sets */
|
|
|
|
int semmns; /* Maximum number of semaphores in all
|
2005-08-02 12:09:40 +00:00
|
|
|
semaphore sets */
|
2008-05-20 21:20:07 +00:00
|
|
|
int semmnu; /* System-wide maximum number of undo
|
|
|
|
structures; unused within kernel */
|
|
|
|
int semmsl; /* Maximum number of semaphores in a
|
|
|
|
set */
|
|
|
|
int semopm; /* Maximum number of operations for
|
|
|
|
semop(2) */
|
|
|
|
int semume; /* Maximum number of undo entries per
|
|
|
|
process; unused within kernel */
|
|
|
|
int semusz; /* Size of struct sem_undo */
|
2005-08-02 12:09:40 +00:00
|
|
|
int semvmx; /* Maximum semaphore value */
|
2007-04-12 22:42:49 +00:00
|
|
|
int semaem; /* Max. value that can be recorded for
|
2005-08-02 12:09:40 +00:00
|
|
|
semaphore adjustment (SEM_UNDO) */
|
|
|
|
};
|
|
|
|
|
2007-12-19 06:57:44 +00:00
|
|
|
.in
|
2005-08-02 12:09:40 +00:00
|
|
|
.fi
|
2007-04-12 22:42:49 +00:00
|
|
|
The
|
2005-08-02 12:09:40 +00:00
|
|
|
.IR semmsl ,
|
|
|
|
.IR semmns ,
|
|
|
|
.IR semopm ,
|
|
|
|
and
|
|
|
|
.I semmni
|
|
|
|
settings can be changed via
|
|
|
|
.IR /proc/sys/kernel/sem ;
|
|
|
|
see
|
2007-04-12 22:42:49 +00:00
|
|
|
.BR proc (5)
|
2005-08-02 12:09:40 +00:00
|
|
|
for details.
|
|
|
|
.TP
|
2007-12-25 21:28:09 +00:00
|
|
|
.BR SEM_INFO " (Linux-specific)"
|
2005-08-02 12:09:40 +00:00
|
|
|
Returns a
|
|
|
|
.I seminfo
|
|
|
|
structure containing the same information as for
|
|
|
|
.BR IPC_INFO ,
|
2007-04-12 22:42:49 +00:00
|
|
|
except that the following fields are returned with information
|
2005-08-02 12:09:40 +00:00
|
|
|
about system resources consumed by semaphores: the
|
|
|
|
.I semusz
|
2007-04-12 22:42:49 +00:00
|
|
|
field returns the number of semaphore sets that currently exist
|
2005-08-02 12:09:40 +00:00
|
|
|
on the system; and the
|
|
|
|
.I semaem
|
2007-04-12 22:42:49 +00:00
|
|
|
field returns the total number of semaphores in all semaphore sets
|
2005-08-02 12:09:40 +00:00
|
|
|
on the system.
|
|
|
|
.TP
|
2007-12-25 21:28:09 +00:00
|
|
|
.BR SEM_STAT " (Linux-specific)"
|
2007-04-12 22:42:49 +00:00
|
|
|
Returns a
|
|
|
|
.I semid_ds
|
2005-08-02 12:09:40 +00:00
|
|
|
structure as for
|
|
|
|
.BR IPC_STAT .
|
|
|
|
However, the
|
|
|
|
.I semid
|
|
|
|
argument is not a semaphore identifier, but instead an index into
|
|
|
|
the kernel's internal array that maintains information about
|
|
|
|
all semaphore sets on the system.
|
|
|
|
.TP
|
2004-11-03 13:51:07 +00:00
|
|
|
.B GETALL
|
|
|
|
Return
|
|
|
|
.B semval
|
2004-11-10 17:27:07 +00:00
|
|
|
(i.e., the current value)
|
2004-11-03 13:51:07 +00:00
|
|
|
for all semaphores of the set into
|
2007-10-12 06:46:45 +00:00
|
|
|
.IR arg.array .
|
2004-11-03 13:51:07 +00:00
|
|
|
The argument
|
|
|
|
.I semnum
|
|
|
|
is ignored.
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B GETNCNT
|
|
|
|
The system call returns the value of
|
|
|
|
.B semncnt
|
2009-09-27 07:44:38 +00:00
|
|
|
for the
|
2004-11-03 13:51:07 +00:00
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set
|
2007-06-08 11:56:22 +00:00
|
|
|
(i.e., the number of processes waiting for an increase of
|
2004-11-03 13:51:07 +00:00
|
|
|
.B semval
|
|
|
|
for the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set).
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B GETPID
|
|
|
|
The system call returns the value of
|
|
|
|
.B sempid
|
|
|
|
for the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set
|
2008-09-10 03:41:35 +00:00
|
|
|
(i.e., the PID of the process that executed the last
|
2007-05-11 23:07:02 +00:00
|
|
|
.BR semop (2)
|
2004-11-03 13:51:07 +00:00
|
|
|
call for the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set).
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B GETVAL
|
|
|
|
The system call returns the value of
|
|
|
|
.B semval
|
|
|
|
for the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set.
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B GETZCNT
|
|
|
|
The system call returns the value of
|
|
|
|
.B semzcnt
|
2009-09-27 07:44:38 +00:00
|
|
|
for the
|
2004-11-03 13:51:07 +00:00
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set
|
2008-09-10 03:41:35 +00:00
|
|
|
(i.e., the number of processes waiting for
|
2004-11-03 13:51:07 +00:00
|
|
|
.B semval
|
|
|
|
of the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set to become 0).
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have read permission on the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B SETALL
|
|
|
|
Set
|
|
|
|
.B semval
|
|
|
|
for all semaphores of the set using
|
2007-10-12 06:46:45 +00:00
|
|
|
.IR arg.array ,
|
2004-11-03 13:51:07 +00:00
|
|
|
updating also the
|
2004-11-10 17:27:07 +00:00
|
|
|
.I sem_ctime
|
2004-11-03 13:51:07 +00:00
|
|
|
member of the
|
2004-11-10 17:27:07 +00:00
|
|
|
.I semid_ds
|
|
|
|
structure associated with the set.
|
|
|
|
Undo entries (see
|
|
|
|
.BR semop (2))
|
|
|
|
are cleared for altered semaphores in all processes.
|
|
|
|
If the changes to semaphore values would permit blocked
|
2007-05-11 23:07:02 +00:00
|
|
|
.BR semop (2)
|
2004-11-10 17:27:07 +00:00
|
|
|
calls in other processes to proceed, then those processes are woken up.
|
2004-11-03 13:51:07 +00:00
|
|
|
The argument
|
|
|
|
.I semnum
|
|
|
|
is ignored.
|
2004-11-10 17:27:07 +00:00
|
|
|
The calling process must have alter (write) permission on
|
|
|
|
the semaphore set.
|
2004-11-03 13:51:07 +00:00
|
|
|
.TP
|
|
|
|
.B SETVAL
|
|
|
|
Set the value of
|
|
|
|
.B semval
|
|
|
|
to
|
2007-09-20 16:26:31 +00:00
|
|
|
.I arg.val
|
2004-11-03 13:51:07 +00:00
|
|
|
for the
|
|
|
|
.IR semnum \-th
|
|
|
|
semaphore of the set, updating also the
|
2004-11-10 17:27:07 +00:00
|
|
|
.I sem_ctime
|
2004-11-03 13:51:07 +00:00
|
|
|
member of the
|
2004-11-10 17:27:07 +00:00
|
|
|
.I semid_ds
|
|
|
|
structure associated with the set.
|
2004-11-03 13:51:07 +00:00
|
|
|
Undo entries are cleared for altered semaphores in all processes.
|
2004-11-10 17:27:07 +00:00
|
|
|
If the changes to semaphore values would permit blocked
|
2007-05-11 23:07:02 +00:00
|
|
|
.BR semop (2)
|
2004-11-10 17:27:07 +00:00
|
|
|
calls in other processes to proceed, then those processes are woken up.
|
|
|
|
The calling process must have alter permission on the semaphore set.
|
getent.1, intro.1, time.1, _exit.2, _syscall.2, accept.2, access.2, acct.2, adjtimex.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bdflush.2, bind.2, brk.2, cacheflush.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, clone.2, close.2, connect.2, create_module.2, delete_module.2, dup.2, epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, flock.2, fork.2, fstatat.2, fsync.2, futex.2, futimesat.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getitimer.2, getpagesize.2, getpeername.2, getpid.2, getpriority.2, getresuid.2, getrlimit.2, getrusage.2, getsid.2, getsockname.2, getsockopt.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, getxattr.2, idle.2, init_module.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, intro.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, io_submit.2, ioctl.2, ioctl_list.2, ioperm.2, iopl.2, ioprio_set.2, ipc.2, kcmp.2, kill.2, killpg.2, link.2, linkat.2, listen.2, listxattr.2, llseek.2, lookup_dcookie.2, lseek.2, madvise.2, migrate_pages.2, mincore.2, mkdir.2, mkdirat.2, mknod.2, mknodat.2, mlock.2, mmap.2, mmap2.2, modify_ldt.2, mount.2, move_pages.2, mprotect.2, mq_getsetattr.2, mremap.2, msgctl.2, msgget.2, msgop.2, msync.2, nanosleep.2, nfsservctl.2, nice.2, open.2, openat.2, outb.2, pause.2, pciconfig_read.2, perf_event_open.2, perfmonctl.2, personality.2, pipe.2, pivot_root.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, ptrace.2, query_module.2, quotactl.2, read.2, readahead.2, readdir.2, readlink.2, readlinkat.2, readv.2, reboot.2, recv.2, remap_file_pages.2, removexattr.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, semctl.2, semget.2, semop.2, send.2, sendfile.2, set_thread_area.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setpgid.2, setresuid.2, setreuid.2, setsid.2, setuid.2, setup.2, setxattr.2, shmctl.2, shmget.2, shmop.2, shutdown.2, sigaction.2, sigaltstack.2, signal.2, signalfd.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, socket.2, socketcall.2, socketpair.2, splice.2, stat.2, statfs.2, stime.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, sysctl.2, sysfs.2, sysinfo.2, syslog.2, tee.2, time.2, timerfd_create.2, times.2, tkill.2, truncate.2, umask.2, umount.2, uname.2, unimplemented.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, MB_CUR_MAX.3, MB_LEN_MAX.3, __setfpucw.3, a64l.3, abort.3, abs.3, acos.3, acosh.3, addseverity.3, adjtime.3, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, alloca.3, argz_add.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, backtrace.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, btowc.3, btree.3, byteorder.3, bzero.3, cabs.3, cacos.3, cacosh.3, canonicalize_file_name.3, carg.3, casin.3, casinh.3, catan.3, catanh.3, catgets.3, catopen.3, cbrt.3, ccos.3, ccosh.3, ceil.3, cerf.3, cexp.3, cexp2.3, cfree.3, cimag.3, clearenv.3, clock.3, clock_getcpuclockid.3, clog.3, clog10.3, clog2.3, closedir.3, cmsg.3, confstr.3, conj.3, copysign.3, cos.3, cosh.3, cpow.3, cproj.3, creal.3, crypt.3, csin.3, csinh.3, csqrt.3, ctan.3, ctanh.3, ctermid.3, ctime.3, daemon.3, dbopen.3, des_crypt.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, encrypt.3, end.3, endian.3, envz_add.3, erf.3, erfc.3, err.3, errno.3, error.3, ether_aton.3, euidaccess.3, exec.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fclose.3, fcloseall.3, fdim.3, fenv.3, ferror.3, fexecve.3, fflush.3, ffs.3, fgetgrent.3, fgetpwent.3, fgetwc.3, fgetws.3, finite.3, flockfile.3, floor.3, fma.3, fmax.3, fmemopen.3, fmin.3, fmod.3, fmtmsg.3, fnmatch.3, fopen.3, fpathconf.3, fpclassify.3, fpurge.3, fputwc.3, fputws.3, fread.3, frexp.3, fseek.3, fseeko.3, ftime.3, ftok.3, fts.3, ftw.3, futimes.3, fwide.3, gamma.3, gcvt.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrent_r.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getipnodebyname.3, getline.3, getloadavg.3, getlogin.3, getmntent.3, getnameinfo.3, getnetent.3, getnetent_r.3, getopt.3, getpass.3, getprotoent.3, getprotoent_r.3, getpt.3, getpw.3, getpwent.3, getpwent_r.3, getpwnam.3, getrpcent.3, getrpcent_r.3, getrpcport.3, gets.3, getservent.3, getservent_r.3, getspnam.3, getttyent.3, getumask.3, getusershell.3, getutent.3, getw.3, getwchar.3, glob.3, grantpt.3, gsignal.3, hash.3, hsearch.3, hypot.3, iconv.3, iconv_close.3, iconv_open.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, isgreater.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, j0.3, key_setsecret.3, ldexp.3, lgamma.3, lio_listio.3, localeconv.3, lockf.3, log.3, log10.3, log1p.3, log2.3, logb.3, login.3, longjmp.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, malloc.3, malloc_hook.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, mempcpy.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mpool.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, nan.3, netlink.3, nextafter.3, nl_langinfo.3, offsetof.3, on_exit.3, opendir.3, openpty.3, perror.3, popen.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, printf.3, profil.3, program_invocation_name.3, psignal.3, pthread_kill_other_threads_np.3, ptsname.3, putenv.3, putgrent.3, putpwent.3, puts.3, putwchar.3, qecvt.3, qsort.3, queue.3, raise.3, rand.3, random.3, random_r.3, rcmd.3, re_comp.3, readdir.3, realpath.3, recno.3, regex.3, remainder.3, remove.3, remquo.3, resolver.3, rewinddir.3, rexec.3, rint.3, round.3, rpc.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, scandirat.3, scanf.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, setlocale.3, setlogmask.3, setnetgrent.3, shm_open.3, siginterrupt.3, signbit.3, significand.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sin.3, sincos.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdarg.3, stdin.3, stdio.3, stdio_ext.3, stpcpy.3, stpncpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfmon.3, strfry.3, strftime.3, string.3, strlen.3, strnlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtod.3, strtoimax.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, termios.3, tgamma.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, towctrans.3, towlower.3, towupper.3, trunc.3, tsearch.3, ttyname.3, ttyslot.3, tzset.3, ualarm.3, ulimit.3, ungetwc.3, unlocked_stdio.3, unlockpt.3, updwtmp.3, usleep.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstoimax.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wordexp.3, wprintf.3, xcrypt.3, xdr.3, y0.3, cciss.4, console.4, console_codes.4, console_ioctl.4, dsp56k.4, fd.4, full.4, hd.4, hpsa.4, initrd.4, intro.4, lp.4, mem.4, mouse.4, null.4, pts.4, ram.4, random.4, rtc.4, sk98lin.4, st.4, tty.4, ttyS.4, tty_ioctl.4, vcs.4, wavelan.4, acct.5, charmap.5, dir_colors.5, filesystems.5, ftpusers.5, group.5, host.conf.5, hosts.5, hosts.equiv.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, passwd.5, proc.5, protocols.5, resolv.conf.5, rpc.5, securetty.5, services.5, shells.5, termcap.5, ttytype.5, utmp.5, armscii-8.7, arp.7, ascii.7, bootparam.7, capabilities.7, charsets.7, complex.7, cp1251.7, credentials.7, ddp.7, environ.7, epoll.7, fifo.7, futex.7, glob.7, hier.7, icmp.7, inotify.7, intro.7, ip.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, locale.7, mailaddr.7, man.7, mq_overview.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, raw.7, regex.7, rtld-audit.7, rtnetlink.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, socket.7, standards.7, suffixes.7, svipc.7, tcp.7, termio.7, time.7, udp.7, udplite.7, unicode.7, unix.7, uri.7, utf-8.7, x25.7, nscd.8, sync.8, tzselect.8, zdump.8, zic.8: Global fix: remove unneeded double quotes in .SH headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:01:36 +00:00
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.SH RETURN VALUE
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2004-11-03 13:51:07 +00:00
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On failure
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2004-12-13 08:39:28 +00:00
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.BR semctl ()
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2004-11-10 17:27:07 +00:00
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returns \-1
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2004-11-03 13:51:07 +00:00
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with
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2004-11-10 17:27:07 +00:00
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.I errno
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2004-11-03 13:51:07 +00:00
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indicating the error.
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2005-08-02 12:09:40 +00:00
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_syscall.2, accept.2, epoll_create.2, inotify_add_watch.2, ioctl.2, msgget.2, msgop.2, open.2, prctl.2, sched_setscheduler.2, semctl.2, semget.2, swapon.2, addseverity.3, cacosh.3, csqrt.3, dirfd.3, drand48.3, fputws.3, mq_send.3, posix_openpt.3, puts.3, sched_getcpu.3, shm_open.3, sqrt.3, sysconf.3, tgamma.3, ulimit.3, credentials.7, svipc.7: Global fix: s/non-negative/nonnegative/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:44:48 +00:00
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Otherwise the system call returns a nonnegative value depending on
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2004-11-03 13:51:07 +00:00
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.I cmd
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as follows:
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2008-08-06 20:41:47 +00:00
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.TP 12
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2004-11-03 13:51:07 +00:00
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.B GETNCNT
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the value of
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.BR semncnt .
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.TP
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.B GETPID
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the value of
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.BR sempid .
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.TP
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.B GETVAL
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the value of
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.BR semval .
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.TP
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.B GETZCNT
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the value of
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.BR semzcnt .
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2005-08-02 12:09:40 +00:00
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.TP
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.B IPC_INFO
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the index of the highest used entry in the
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kernel's internal array recording information about all
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semaphore sets.
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(This information can be used with repeated
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2007-04-12 22:42:49 +00:00
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.B SEM_STAT
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2005-08-02 12:09:40 +00:00
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operations to obtain information about all semaphore sets on the system.)
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.TP
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.B SEM_INFO
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2007-04-12 22:42:49 +00:00
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As for
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2005-08-02 12:09:40 +00:00
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.BR IPC_INFO .
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.TP
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.B SEM_STAT
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the identifier of the semaphore set whose index was given in
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.IR semid .
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2004-11-03 13:51:07 +00:00
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.LP
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All other
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.I cmd
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values return 0 on success.
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.SH ERRORS
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On failure,
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2004-11-10 17:27:07 +00:00
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.I errno
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2004-11-03 13:51:07 +00:00
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will be set to one of the following:
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2008-08-06 20:33:17 +00:00
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.TP
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2004-11-03 13:51:07 +00:00
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.B EACCES
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The argument
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.I cmd
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has one of the values
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.BR GETALL ,
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.BR GETPID ,
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.BR GETVAL ,
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.BR GETNCNT ,
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.BR GETZCNT ,
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.BR IPC_STAT ,
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.BR SEM_STAT ,
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.BR SETALL ,
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or
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.B SETVAL
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and the calling process does not have the required
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permissions on the semaphore set and does not have the
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.B CAP_IPC_OWNER
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capability.
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.TP
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.B EFAULT
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The address pointed to by
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2007-09-20 16:26:31 +00:00
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.I arg.buf
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2004-11-03 13:51:07 +00:00
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or
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2007-09-20 16:26:31 +00:00
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.I arg.array
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2004-11-03 13:51:07 +00:00
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isn't accessible.
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.TP
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.B EIDRM
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The semaphore set was removed.
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.TP
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.B EINVAL
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Invalid value for
|
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.I cmd
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or
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.IR semid .
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2005-08-02 12:09:40 +00:00
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Or: for a
|
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.B SEM_STAT
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2007-04-12 22:42:49 +00:00
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operation, the index value specified in
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2005-08-02 12:09:40 +00:00
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.I semid
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referred to an array slot that is currently unused.
|
2004-11-03 13:51:07 +00:00
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.TP
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.B EPERM
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The argument
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.I cmd
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2004-11-10 17:27:07 +00:00
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has the value
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2004-11-03 13:51:07 +00:00
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.B IPC_SET
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or
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.B IPC_RMID
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2004-11-10 17:27:07 +00:00
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but the effective user ID of the calling process is not the creator
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2004-11-03 13:51:07 +00:00
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(as found in
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.IR sem_perm.cuid )
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or the owner
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(as found in
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.IR sem_perm.uid )
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of the semaphore set,
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and the process does not have the
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.B CAP_SYS_ADMIN
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capability.
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.TP
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.B ERANGE
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The argument
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.I cmd
|
2004-11-10 17:27:07 +00:00
|
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has the value
|
2004-11-03 13:51:07 +00:00
|
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.B SETALL
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or
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.B SETVAL
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and the value to which
|
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.B semval
|
2004-11-10 17:27:07 +00:00
|
|
|
is to be set (for some semaphore of the set) is less than 0
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|
or greater than the implementation limit
|
2004-11-03 13:51:07 +00:00
|
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.BR SEMVMX .
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getent.1, intro.1, time.1, _exit.2, _syscall.2, accept.2, access.2, acct.2, adjtimex.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bdflush.2, bind.2, brk.2, cacheflush.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, clone.2, close.2, connect.2, create_module.2, delete_module.2, dup.2, epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, flock.2, fork.2, fstatat.2, fsync.2, futex.2, futimesat.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getitimer.2, getpagesize.2, getpeername.2, getpid.2, getpriority.2, getresuid.2, getrlimit.2, getrusage.2, getsid.2, getsockname.2, getsockopt.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, getxattr.2, idle.2, init_module.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, intro.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, io_submit.2, ioctl.2, ioctl_list.2, ioperm.2, iopl.2, ioprio_set.2, ipc.2, kcmp.2, kill.2, killpg.2, link.2, linkat.2, listen.2, listxattr.2, llseek.2, lookup_dcookie.2, lseek.2, madvise.2, migrate_pages.2, mincore.2, mkdir.2, mkdirat.2, mknod.2, mknodat.2, mlock.2, mmap.2, mmap2.2, modify_ldt.2, mount.2, move_pages.2, mprotect.2, mq_getsetattr.2, mremap.2, msgctl.2, msgget.2, msgop.2, msync.2, nanosleep.2, nfsservctl.2, nice.2, open.2, openat.2, outb.2, pause.2, pciconfig_read.2, perf_event_open.2, perfmonctl.2, personality.2, pipe.2, pivot_root.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, ptrace.2, query_module.2, quotactl.2, read.2, readahead.2, readdir.2, readlink.2, readlinkat.2, readv.2, reboot.2, recv.2, remap_file_pages.2, removexattr.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, semctl.2, semget.2, semop.2, send.2, sendfile.2, set_thread_area.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setpgid.2, setresuid.2, setreuid.2, setsid.2, setuid.2, setup.2, setxattr.2, shmctl.2, shmget.2, shmop.2, shutdown.2, sigaction.2, sigaltstack.2, signal.2, signalfd.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, socket.2, socketcall.2, socketpair.2, splice.2, stat.2, statfs.2, stime.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, sysctl.2, sysfs.2, sysinfo.2, syslog.2, tee.2, time.2, timerfd_create.2, times.2, tkill.2, truncate.2, umask.2, umount.2, uname.2, unimplemented.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, MB_CUR_MAX.3, MB_LEN_MAX.3, __setfpucw.3, a64l.3, abort.3, abs.3, acos.3, acosh.3, addseverity.3, adjtime.3, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, alloca.3, argz_add.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, backtrace.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, btowc.3, btree.3, byteorder.3, bzero.3, cabs.3, cacos.3, cacosh.3, canonicalize_file_name.3, carg.3, casin.3, casinh.3, catan.3, catanh.3, catgets.3, catopen.3, cbrt.3, ccos.3, ccosh.3, ceil.3, cerf.3, cexp.3, cexp2.3, cfree.3, cimag.3, clearenv.3, clock.3, clock_getcpuclockid.3, clog.3, clog10.3, clog2.3, closedir.3, cmsg.3, confstr.3, conj.3, copysign.3, cos.3, cosh.3, cpow.3, cproj.3, creal.3, crypt.3, csin.3, csinh.3, csqrt.3, ctan.3, ctanh.3, ctermid.3, ctime.3, daemon.3, dbopen.3, des_crypt.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, encrypt.3, end.3, endian.3, envz_add.3, erf.3, erfc.3, err.3, errno.3, error.3, ether_aton.3, euidaccess.3, exec.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fclose.3, fcloseall.3, fdim.3, fenv.3, ferror.3, fexecve.3, fflush.3, ffs.3, fgetgrent.3, fgetpwent.3, fgetwc.3, fgetws.3, finite.3, flockfile.3, floor.3, fma.3, fmax.3, fmemopen.3, fmin.3, fmod.3, fmtmsg.3, fnmatch.3, fopen.3, fpathconf.3, fpclassify.3, fpurge.3, fputwc.3, fputws.3, fread.3, frexp.3, fseek.3, fseeko.3, ftime.3, ftok.3, fts.3, ftw.3, futimes.3, fwide.3, gamma.3, gcvt.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrent_r.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getipnodebyname.3, getline.3, getloadavg.3, getlogin.3, getmntent.3, getnameinfo.3, getnetent.3, getnetent_r.3, getopt.3, getpass.3, getprotoent.3, getprotoent_r.3, getpt.3, getpw.3, getpwent.3, getpwent_r.3, getpwnam.3, getrpcent.3, getrpcent_r.3, getrpcport.3, gets.3, getservent.3, getservent_r.3, getspnam.3, getttyent.3, getumask.3, getusershell.3, getutent.3, getw.3, getwchar.3, glob.3, grantpt.3, gsignal.3, hash.3, hsearch.3, hypot.3, iconv.3, iconv_close.3, iconv_open.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, isgreater.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, j0.3, key_setsecret.3, ldexp.3, lgamma.3, lio_listio.3, localeconv.3, lockf.3, log.3, log10.3, log1p.3, log2.3, logb.3, login.3, longjmp.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, malloc.3, malloc_hook.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, mempcpy.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mpool.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, nan.3, netlink.3, nextafter.3, nl_langinfo.3, offsetof.3, on_exit.3, opendir.3, openpty.3, perror.3, popen.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, printf.3, profil.3, program_invocation_name.3, psignal.3, pthread_kill_other_threads_np.3, ptsname.3, putenv.3, putgrent.3, putpwent.3, puts.3, putwchar.3, qecvt.3, qsort.3, queue.3, raise.3, rand.3, random.3, random_r.3, rcmd.3, re_comp.3, readdir.3, realpath.3, recno.3, regex.3, remainder.3, remove.3, remquo.3, resolver.3, rewinddir.3, rexec.3, rint.3, round.3, rpc.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, scandirat.3, scanf.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, setlocale.3, setlogmask.3, setnetgrent.3, shm_open.3, siginterrupt.3, signbit.3, significand.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sin.3, sincos.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdarg.3, stdin.3, stdio.3, stdio_ext.3, stpcpy.3, stpncpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfmon.3, strfry.3, strftime.3, string.3, strlen.3, strnlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtod.3, strtoimax.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, termios.3, tgamma.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, towctrans.3, towlower.3, towupper.3, trunc.3, tsearch.3, ttyname.3, ttyslot.3, tzset.3, ualarm.3, ulimit.3, ungetwc.3, unlocked_stdio.3, unlockpt.3, updwtmp.3, usleep.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstoimax.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wordexp.3, wprintf.3, xcrypt.3, xdr.3, y0.3, cciss.4, console.4, console_codes.4, console_ioctl.4, dsp56k.4, fd.4, full.4, hd.4, hpsa.4, initrd.4, intro.4, lp.4, mem.4, mouse.4, null.4, pts.4, ram.4, random.4, rtc.4, sk98lin.4, st.4, tty.4, ttyS.4, tty_ioctl.4, vcs.4, wavelan.4, acct.5, charmap.5, dir_colors.5, filesystems.5, ftpusers.5, group.5, host.conf.5, hosts.5, hosts.equiv.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, passwd.5, proc.5, protocols.5, resolv.conf.5, rpc.5, securetty.5, services.5, shells.5, termcap.5, ttytype.5, utmp.5, armscii-8.7, arp.7, ascii.7, bootparam.7, capabilities.7, charsets.7, complex.7, cp1251.7, credentials.7, ddp.7, environ.7, epoll.7, fifo.7, futex.7, glob.7, hier.7, icmp.7, inotify.7, intro.7, ip.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, locale.7, mailaddr.7, man.7, mq_overview.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, raw.7, regex.7, rtld-audit.7, rtnetlink.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, socket.7, standards.7, suffixes.7, svipc.7, tcp.7, termio.7, time.7, udp.7, udplite.7, unicode.7, unix.7, uri.7, utf-8.7, x25.7, nscd.8, sync.8, tzselect.8, zdump.8, zic.8: Global fix: remove unneeded double quotes in .SH headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:01:36 +00:00
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.SH CONFORMING TO
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2007-05-18 16:06:42 +00:00
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SVr4, POSIX.1-2001.
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.\" SVr4 documents more error conditions EINVAL and EOVERFLOW.
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2013-06-03 16:44:45 +00:00
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POSIX.1-2001 specifies the
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.I sem_nsems
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field of the
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.I semid_ds
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structure as having the type
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.IR "unsigned\ short" ,
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and the field is so defined on most other systems.
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It was also so defined on Linux 2.2 and earlier,
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but, since Linux 2.4, the field has the type
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.IR "unsigned\ long" .
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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2012-05-31 12:55:28 +00:00
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The inclusion of
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.I <sys/types.h>
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and
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.I <sys/ipc.h>
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isn't required on Linux or by any version of POSIX.
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However,
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some old implementations required the inclusion of these header files,
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and the SVID also documented their inclusion.
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Applications intended to be portable to such old systems may need
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to include these header files.
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.\" Like Linux, the FreeBSD man pages still document
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.\" the inclusion of these header files.
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2004-11-03 13:51:07 +00:00
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The
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.BR IPC_INFO ,
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2007-09-20 16:26:31 +00:00
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.B SEM_STAT
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2004-11-03 13:51:07 +00:00
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and
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.B SEM_INFO
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2005-08-02 12:09:40 +00:00
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operations are used by the
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2010-06-13 09:12:43 +00:00
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.BR ipcs (1)
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2004-11-03 13:51:07 +00:00
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program to provide information on allocated resources.
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2013-08-08 08:27:36 +00:00
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In the future these may modified or moved to a
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.I /proc
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filesystem interface.
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2004-11-03 13:51:07 +00:00
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.LP
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2007-06-25 10:03:10 +00:00
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Various fields in a \fIstruct semid_ds\fP were typed as
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.I short
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under Linux 2.2
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and have become
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.I long
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under Linux 2.4.
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2007-06-08 03:17:37 +00:00
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To take advantage of this,
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2004-11-03 13:51:07 +00:00
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a recompilation under glibc-2.1.91 or later should suffice.
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2007-06-22 17:16:20 +00:00
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(The kernel distinguishes old and new calls by an
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2007-09-20 16:26:31 +00:00
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.B IPC_64
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2007-06-22 17:16:20 +00:00
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flag in
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2004-11-03 13:51:07 +00:00
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.IR cmd .)
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.PP
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2004-11-10 17:27:07 +00:00
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In some earlier versions of glibc, the
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.I semun
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2007-06-20 21:53:34 +00:00
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union was defined in \fI<sys/sem.h>\fP, but POSIX.1-2001 requires
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2004-11-10 17:27:07 +00:00
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that the caller define this union.
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On versions of glibc where this union is \fInot\fP defined,
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the macro
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.B _SEM_SEMUN_UNDEFINED
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2007-06-20 21:53:34 +00:00
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is defined in \fI<sys/sem.h>\fP.
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2004-11-10 17:27:07 +00:00
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.PP
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2004-11-03 13:51:07 +00:00
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The following system limit on semaphore sets affects a
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2004-12-13 08:39:28 +00:00
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.BR semctl ()
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2004-11-03 13:51:07 +00:00
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call:
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2008-08-06 20:33:17 +00:00
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.TP
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2004-11-03 13:51:07 +00:00
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.B SEMVMX
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Maximum value for
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.BR semval :
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implementation dependent (32767).
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.LP
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For greater portability it is best to always call
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2004-12-13 08:39:28 +00:00
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.BR semctl ()
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2004-11-03 13:51:07 +00:00
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with four arguments.
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getent.1, intro.1, time.1, _exit.2, _syscall.2, accept.2, access.2, acct.2, adjtimex.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bdflush.2, bind.2, brk.2, cacheflush.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, clone.2, close.2, connect.2, create_module.2, delete_module.2, dup.2, epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, flock.2, fork.2, fstatat.2, fsync.2, futex.2, futimesat.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getitimer.2, getpagesize.2, getpeername.2, getpid.2, getpriority.2, getresuid.2, getrlimit.2, getrusage.2, getsid.2, getsockname.2, getsockopt.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, getxattr.2, idle.2, init_module.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, intro.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, io_submit.2, ioctl.2, ioctl_list.2, ioperm.2, iopl.2, ioprio_set.2, ipc.2, kcmp.2, kill.2, killpg.2, link.2, linkat.2, listen.2, listxattr.2, llseek.2, lookup_dcookie.2, lseek.2, madvise.2, migrate_pages.2, mincore.2, mkdir.2, mkdirat.2, mknod.2, mknodat.2, mlock.2, mmap.2, mmap2.2, modify_ldt.2, mount.2, move_pages.2, mprotect.2, mq_getsetattr.2, mremap.2, msgctl.2, msgget.2, msgop.2, msync.2, nanosleep.2, nfsservctl.2, nice.2, open.2, openat.2, outb.2, pause.2, pciconfig_read.2, perf_event_open.2, perfmonctl.2, personality.2, pipe.2, pivot_root.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, ptrace.2, query_module.2, quotactl.2, read.2, readahead.2, readdir.2, readlink.2, readlinkat.2, readv.2, reboot.2, recv.2, remap_file_pages.2, removexattr.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, select.2, semctl.2, semget.2, semop.2, send.2, sendfile.2, set_thread_area.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setpgid.2, setresuid.2, setreuid.2, setsid.2, setuid.2, setup.2, setxattr.2, shmctl.2, shmget.2, shmop.2, shutdown.2, sigaction.2, sigaltstack.2, signal.2, signalfd.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, socket.2, socketcall.2, socketpair.2, splice.2, stat.2, statfs.2, stime.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, sysctl.2, sysfs.2, sysinfo.2, syslog.2, tee.2, time.2, timerfd_create.2, times.2, tkill.2, truncate.2, umask.2, umount.2, uname.2, unimplemented.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, MB_CUR_MAX.3, MB_LEN_MAX.3, __setfpucw.3, a64l.3, abort.3, abs.3, acos.3, acosh.3, addseverity.3, adjtime.3, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, alloca.3, argz_add.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, backtrace.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, btowc.3, btree.3, byteorder.3, bzero.3, cabs.3, cacos.3, cacosh.3, canonicalize_file_name.3, carg.3, casin.3, casinh.3, catan.3, catanh.3, catgets.3, catopen.3, cbrt.3, ccos.3, ccosh.3, ceil.3, cerf.3, cexp.3, cexp2.3, cfree.3, cimag.3, clearenv.3, clock.3, clock_getcpuclockid.3, clog.3, clog10.3, clog2.3, closedir.3, cmsg.3, confstr.3, conj.3, copysign.3, cos.3, cosh.3, cpow.3, cproj.3, creal.3, crypt.3, csin.3, csinh.3, csqrt.3, ctan.3, ctanh.3, ctermid.3, ctime.3, daemon.3, dbopen.3, des_crypt.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, encrypt.3, end.3, endian.3, envz_add.3, erf.3, erfc.3, err.3, errno.3, error.3, ether_aton.3, euidaccess.3, exec.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fclose.3, fcloseall.3, fdim.3, fenv.3, ferror.3, fexecve.3, fflush.3, ffs.3, fgetgrent.3, fgetpwent.3, fgetwc.3, fgetws.3, finite.3, flockfile.3, floor.3, fma.3, fmax.3, fmemopen.3, fmin.3, fmod.3, fmtmsg.3, fnmatch.3, fopen.3, fpathconf.3, fpclassify.3, fpurge.3, fputwc.3, fputws.3, fread.3, frexp.3, fseek.3, fseeko.3, ftime.3, ftok.3, fts.3, ftw.3, futimes.3, fwide.3, gamma.3, gcvt.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrent_r.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getipnodebyname.3, getline.3, getloadavg.3, getlogin.3, getmntent.3, getnameinfo.3, getnetent.3, getnetent_r.3, getopt.3, getpass.3, getprotoent.3, getprotoent_r.3, getpt.3, getpw.3, getpwent.3, getpwent_r.3, getpwnam.3, getrpcent.3, getrpcent_r.3, getrpcport.3, gets.3, getservent.3, getservent_r.3, getspnam.3, getttyent.3, getumask.3, getusershell.3, getutent.3, getw.3, getwchar.3, glob.3, grantpt.3, gsignal.3, hash.3, hsearch.3, hypot.3, iconv.3, iconv_close.3, iconv_open.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, isgreater.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, j0.3, key_setsecret.3, ldexp.3, lgamma.3, lio_listio.3, localeconv.3, lockf.3, log.3, log10.3, log1p.3, log2.3, logb.3, login.3, longjmp.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, malloc.3, malloc_hook.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, mempcpy.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mpool.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, nan.3, netlink.3, nextafter.3, nl_langinfo.3, offsetof.3, on_exit.3, opendir.3, openpty.3, perror.3, popen.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, printf.3, profil.3, program_invocation_name.3, psignal.3, pthread_kill_other_threads_np.3, ptsname.3, putenv.3, putgrent.3, putpwent.3, puts.3, putwchar.3, qecvt.3, qsort.3, queue.3, raise.3, rand.3, random.3, random_r.3, rcmd.3, re_comp.3, readdir.3, realpath.3, recno.3, regex.3, remainder.3, remove.3, remquo.3, resolver.3, rewinddir.3, rexec.3, rint.3, round.3, rpc.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, scandirat.3, scanf.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, setlocale.3, setlogmask.3, setnetgrent.3, shm_open.3, siginterrupt.3, signbit.3, significand.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sin.3, sincos.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdarg.3, stdin.3, stdio.3, stdio_ext.3, stpcpy.3, stpncpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfmon.3, strfry.3, strftime.3, string.3, strlen.3, strnlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtod.3, strtoimax.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, termios.3, tgamma.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, towctrans.3, towlower.3, towupper.3, trunc.3, tsearch.3, ttyname.3, ttyslot.3, tzset.3, ualarm.3, ulimit.3, ungetwc.3, unlocked_stdio.3, unlockpt.3, updwtmp.3, usleep.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstoimax.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wordexp.3, wprintf.3, xcrypt.3, xdr.3, y0.3, cciss.4, console.4, console_codes.4, console_ioctl.4, dsp56k.4, fd.4, full.4, hd.4, hpsa.4, initrd.4, intro.4, lp.4, mem.4, mouse.4, null.4, pts.4, ram.4, random.4, rtc.4, sk98lin.4, st.4, tty.4, ttyS.4, tty_ioctl.4, vcs.4, wavelan.4, acct.5, charmap.5, dir_colors.5, filesystems.5, ftpusers.5, group.5, host.conf.5, hosts.5, hosts.equiv.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, passwd.5, proc.5, protocols.5, resolv.conf.5, rpc.5, securetty.5, services.5, shells.5, termcap.5, ttytype.5, utmp.5, armscii-8.7, arp.7, ascii.7, bootparam.7, capabilities.7, charsets.7, complex.7, cp1251.7, credentials.7, ddp.7, environ.7, epoll.7, fifo.7, futex.7, glob.7, hier.7, icmp.7, inotify.7, intro.7, ip.7, ipv6.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, locale.7, mailaddr.7, man.7, mq_overview.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, pipe.7, posixoptions.7, pthreads.7, pty.7, raw.7, regex.7, rtld-audit.7, rtnetlink.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, socket.7, standards.7, suffixes.7, svipc.7, tcp.7, termio.7, time.7, udp.7, udplite.7, unicode.7, unix.7, uri.7, utf-8.7, x25.7, nscd.8, sync.8, tzselect.8, zdump.8, zic.8: Global fix: remove unneeded double quotes in .SH headings
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-02-24 18:01:36 +00:00
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.SH SEE ALSO
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2004-11-03 13:51:07 +00:00
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.BR ipc (2),
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.BR semget (2),
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.BR semop (2),
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2006-03-25 20:50:40 +00:00
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.BR capabilities (7),
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2006-04-21 03:53:43 +00:00
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.BR sem_overview (7),
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.BR svipc (7)
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