2008-09-09 05:48:00 +00:00
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.\" Copyright (c) 2008, Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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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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2008-09-09 05:48:00 +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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.\"
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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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.\"
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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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2008-09-09 05:48:00 +00:00
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.\"
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2013-03-17 07:49:00 +00:00
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.TH FOPENCOOKIE 3 2013-03-17 "Linux" "Linux Programmer's Manual"
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2008-09-09 05:48:00 +00:00
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.SH NAME
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fopencookie \- opening a custom stream
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.SH SYNOPSIS
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.nf
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getresuid.2, mremap.2, poll.2, remap_file_pages.2, setresuid.2, splice.2, sync_file_range.2, syscall.2, tee.2, vmsplice.2, INFINITY.3, aio_init.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, fopencookie.3, ftw.3, getaddrinfo_a.3, getloadavg.3, getutent.3, grantpt.3, hsearch.3, lseek64.3, memmem.3, mempcpy.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, sched_getcpu.3, sincos.3, strchr.3, strfry.3, strnlen.3, strptime.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlockpt.3, wcwidth.3: Add reference to feature_test_macros(7)
Some pages simply list feature test macro requirements in
the form:
#define #GNU_SOURCE
#include <someheader.h>
For these pages, add a "See feature_test_macros(7)" comment
on the "#define" line.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 04:31:47 +00:00
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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2008-09-09 05:48:00 +00:00
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.B #include <stdio.h>
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.BI "FILE *fopencookie(void *" cookie ", const char *" mode ,
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.BI " cookie_io_functions_t " io_funcs );
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.fi
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.SH DESCRIPTION
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The
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.BR fopencookie ()
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function allows the programmer to create a custom implementation
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for a standard I/O stream.
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This implementation can store the stream's data at a location of
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its own choosing; for example,
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.BR fopencookie ()
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is used to implement
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.BR fmemopen (3),
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2009-12-05 05:11:59 +00:00
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which provides a stream interface to data that is stored in a
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2008-09-09 05:48:00 +00:00
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buffer in memory.
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In order to create a custom stream the programmer must:
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.IP * 3
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Implement four "hook" functions that are used internally by the
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standard I/O library when performing I/O on the stream.
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.IP *
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Define a "cookie" data type,
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a structure that provides bookkeeping information
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(e.g., where to store data) used by the aforementioned hook functions.
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The standard I/O package knows nothing about the contents of this cookie
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(thus it is typed as
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.IR "void\ *"
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when passed to
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.BR fopencookie ()),
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but automatically supplies the cookie
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|
as the first argument when calling the hook functions.
|
|
|
|
.IP *
|
|
|
|
Call
|
|
|
|
.BR fopencookie ()
|
|
|
|
to open a new stream and associate the cookie and hook functions
|
|
|
|
with that stream.
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.BR fopencookie ()
|
|
|
|
function serves a purpose similar to
|
|
|
|
.BR fopen (3):
|
2008-09-10 12:39:34 +00:00
|
|
|
it opens a new stream and returns a pointer to a
|
2008-09-09 05:48:00 +00:00
|
|
|
.I FILE
|
|
|
|
object that is used to operate on that stream.
|
|
|
|
|
|
|
|
The
|
|
|
|
.I cookie
|
|
|
|
argument is a pointer to the caller's cookie structure
|
|
|
|
that is to be associated with the new stream.
|
|
|
|
This pointer is supplied as the first argument when the standard I/O
|
|
|
|
library invokes any of the hook functions described below.
|
|
|
|
|
|
|
|
The
|
|
|
|
.I mode
|
|
|
|
argument serves the same purpose as for
|
|
|
|
.BR fopen (3).
|
|
|
|
The following modes are supported:
|
|
|
|
.IR r ,
|
|
|
|
.IR w ,
|
|
|
|
.IR a ,
|
|
|
|
.IR r+ ,
|
|
|
|
.IR w+ ,
|
|
|
|
and
|
|
|
|
.IR a+ .
|
|
|
|
See
|
|
|
|
.BR fopen (3)
|
|
|
|
for details.
|
|
|
|
|
|
|
|
The
|
|
|
|
.I io_funcs
|
|
|
|
argument is a structure that contains four fields pointing to the
|
|
|
|
programmer-defined hook functions that are used to implement this stream.
|
|
|
|
The structure is defined as follows
|
|
|
|
.in +4n
|
|
|
|
.nf
|
|
|
|
|
2013-03-17 07:49:00 +00:00
|
|
|
typedef struct {
|
2008-09-09 05:48:00 +00:00
|
|
|
cookie_read_function_t *read;
|
|
|
|
cookie_write_function_t *write;
|
|
|
|
cookie_seek_function_t *seek;
|
|
|
|
cookie_close_function_t *close;
|
2013-03-17 07:49:00 +00:00
|
|
|
} cookie_io_functions_t;
|
2008-09-09 05:48:00 +00:00
|
|
|
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
The four fields are as follows:
|
|
|
|
.TP
|
|
|
|
.I cookie_read_function_t *read
|
|
|
|
This function implements read operations for the stream.
|
|
|
|
When called, it receives three arguments:
|
|
|
|
|
|
|
|
ssize_t read(void *cookie, char *buf, size_t size);
|
|
|
|
|
|
|
|
The
|
|
|
|
.I buf
|
|
|
|
and
|
|
|
|
.I size
|
|
|
|
arguments are, respectively,
|
|
|
|
a buffer into which input data can be placed and the size of that buffer.
|
|
|
|
As its function result, the
|
|
|
|
.I read
|
|
|
|
function should return the number of bytes copied into
|
|
|
|
.IR buf ,
|
|
|
|
0 on end of file, or \-1 on error.
|
|
|
|
The
|
|
|
|
.I read
|
|
|
|
function should update the stream offset appropriately.
|
|
|
|
|
|
|
|
If
|
|
|
|
.I *read
|
epoll_ctl.2, execve.2, recv.2, timer_create.2, wait.2, argz_add.3, basename.3, dlopen.3, exec.3, fopencookie.3, fts.3, getaddrinfo.3, getcwd.3, gethostbyname.3, getifaddrs.3, getipnodebyname.3, getlogin.3, getnetent.3, getprotoent.3, getrpcent.3, getservent.3, getusershell.3, glob.3, if_nameindex.3, inet_ntop.3, lio_listio.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mq_notify.3, ptsname.3, realpath.3, setnetgrent.3, sigvec.3, strsignal.3, strtok.3, wcrtomb.3, wcsnrtombs.3, wcsrtombs.3, wcstombs.3, xdr.3: Global fix of "NULL pointer"
Change "NULL pointer: to "NUL " or null pointer".
POSIX uses the term "null pointer", not "NULL pointer".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-01-03 02:01:50 +00:00
|
|
|
is a null pointer,
|
2008-09-09 05:48:00 +00:00
|
|
|
then reads from the custom stream always return end of file.
|
|
|
|
.TP
|
|
|
|
.I cookie_write_function_t *write
|
|
|
|
This function implements write operations for the stream.
|
|
|
|
When called, it receives three arguments:
|
|
|
|
|
|
|
|
ssize_t write(void *cookie, const char *buf, size_t size);
|
|
|
|
|
|
|
|
The
|
|
|
|
.I buf
|
|
|
|
and
|
|
|
|
.I size
|
|
|
|
arguments are, respectively,
|
|
|
|
a buffer of data to be output to the stream and the size of that buffer.
|
|
|
|
As its function result, the
|
|
|
|
.I write
|
|
|
|
function should return the number of bytes copied from
|
|
|
|
.IR buf ,
|
2012-04-30 01:09:01 +00:00
|
|
|
or 0 on error.
|
|
|
|
(The function must not return a negative value.)
|
2008-09-09 05:48:00 +00:00
|
|
|
The
|
|
|
|
.I write
|
|
|
|
function should update the stream offset appropriately.
|
|
|
|
|
|
|
|
If
|
|
|
|
.I *write
|
epoll_ctl.2, execve.2, recv.2, timer_create.2, wait.2, argz_add.3, basename.3, dlopen.3, exec.3, fopencookie.3, fts.3, getaddrinfo.3, getcwd.3, gethostbyname.3, getifaddrs.3, getipnodebyname.3, getlogin.3, getnetent.3, getprotoent.3, getrpcent.3, getservent.3, getusershell.3, glob.3, if_nameindex.3, inet_ntop.3, lio_listio.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mq_notify.3, ptsname.3, realpath.3, setnetgrent.3, sigvec.3, strsignal.3, strtok.3, wcrtomb.3, wcsnrtombs.3, wcsrtombs.3, wcstombs.3, xdr.3: Global fix of "NULL pointer"
Change "NULL pointer: to "NUL " or null pointer".
POSIX uses the term "null pointer", not "NULL pointer".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-01-03 02:01:50 +00:00
|
|
|
is a null pointer,
|
2008-09-09 05:48:00 +00:00
|
|
|
then output to the stream is discarded.
|
|
|
|
.TP
|
|
|
|
.I cookie_seek_function_t *seek
|
|
|
|
This function implements seek operations on the stream.
|
|
|
|
When called, it receives three arguments:
|
|
|
|
|
|
|
|
int seek(void *cookie, off64_t *offset, int whence);
|
|
|
|
|
|
|
|
The
|
|
|
|
.I *offset
|
|
|
|
argument specifies the new file offset depending on which
|
|
|
|
of the following three values is supplied in
|
|
|
|
.IR whence :
|
|
|
|
.RS
|
|
|
|
.TP 10
|
|
|
|
.B SEEK_SET
|
|
|
|
The stream offset should be set
|
|
|
|
.I *offset
|
|
|
|
bytes from the start of the stream.
|
|
|
|
.TP
|
|
|
|
.B SEEK_CUR
|
|
|
|
.I *offset
|
|
|
|
should be added to the current stream offset.
|
|
|
|
.TP
|
|
|
|
.B SEEK_END
|
|
|
|
The stream offset should be set to the size of the stream plus
|
|
|
|
.IR *offset .
|
|
|
|
.RE
|
|
|
|
.IP
|
|
|
|
Before returning, the
|
|
|
|
.I seek
|
|
|
|
function should update
|
|
|
|
.I *offset
|
|
|
|
to indicate the new stream offset.
|
|
|
|
|
|
|
|
As its function result, the
|
|
|
|
.I seek
|
|
|
|
function should return 0 on success, and \-1 on error.
|
|
|
|
|
|
|
|
If
|
|
|
|
.I *seek
|
epoll_ctl.2, execve.2, recv.2, timer_create.2, wait.2, argz_add.3, basename.3, dlopen.3, exec.3, fopencookie.3, fts.3, getaddrinfo.3, getcwd.3, gethostbyname.3, getifaddrs.3, getipnodebyname.3, getlogin.3, getnetent.3, getprotoent.3, getrpcent.3, getservent.3, getusershell.3, glob.3, if_nameindex.3, inet_ntop.3, lio_listio.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mq_notify.3, ptsname.3, realpath.3, setnetgrent.3, sigvec.3, strsignal.3, strtok.3, wcrtomb.3, wcsnrtombs.3, wcsrtombs.3, wcstombs.3, xdr.3: Global fix of "NULL pointer"
Change "NULL pointer: to "NUL " or null pointer".
POSIX uses the term "null pointer", not "NULL pointer".
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-01-03 02:01:50 +00:00
|
|
|
is a null pointer,
|
2008-09-09 05:48:00 +00:00
|
|
|
then it is not possible to perform seek operations on the stream.
|
|
|
|
.TP
|
|
|
|
.I cookie_close_function_t *close
|
|
|
|
This function closes the stream.
|
|
|
|
The hook function can do things such as freeing buffers allocated
|
|
|
|
for the stream.
|
|
|
|
When called, it receives one argument:
|
|
|
|
|
|
|
|
int close(void *cookie);
|
|
|
|
|
|
|
|
The
|
|
|
|
.I cookie
|
|
|
|
argument is the cookie that the programmer supplied when calling
|
|
|
|
.BR fopencookie ().
|
|
|
|
|
|
|
|
As its function result, the
|
|
|
|
.I close
|
|
|
|
function should return 0 on success, and
|
|
|
|
.B EOF
|
|
|
|
on error.
|
|
|
|
|
|
|
|
If
|
|
|
|
.I *close
|
|
|
|
is NULL, then no special action is performed when the stream is closed.
|
|
|
|
.SH RETURN VALUE
|
|
|
|
On success
|
|
|
|
.BR fopencookie ()
|
|
|
|
returns a pointer to the new stream.
|
|
|
|
On error, NULL is returned.
|
|
|
|
.\" .SH ERRORS
|
|
|
|
.\" It's not clear if errno ever gets set...
|
|
|
|
.SH CONFORMING TO
|
accept.2, execve.2, futimesat.2, getresuid.2, getrlimit.2, madvise.2, mq_getsetattr.2, msgctl.2, nice.2, open.2, poll.2, setresuid.2, shmctl.2, sigaction.2, times.2, utimensat.2, __setfpucw.3, atoi.3, endian.3, err.3, euidaccess.3, fenv.3, fopencookie.3, fpurge.3, getgrouplist.3, getutmp.3, j0.3, lgamma.3, netlink.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_cleanup_push_defer_np.3, pthread_getattr_np.3, pthread_kill_other_threads_np.3, pthread_setaffinity_np.3, pthread_tryjoin_np.3, pthread_yield.3, random_r.3, readdir.3, rtnetlink.3, scanf.3, setenv.3, significand.3, sigsetops.3, strerror.3, strstr.3, sysv_signal.3, termios.3, timegm.3, unlocked_stdio.3, y0.3, locale.5, bootparam.7, feature_test_macros.7, ip.7, locale.7, pthreads.7, rtld-audit.7, nscd.8: Global fix: s/non-standard/nonstandard/
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 16:37:52 +00:00
|
|
|
This function is a nonstandard GNU extension.
|
2008-09-09 05:48:00 +00:00
|
|
|
.SH EXAMPLE
|
|
|
|
The program below implements a custom stream whose functionality
|
|
|
|
is similar (but not identical) to that available via
|
|
|
|
.BR fmemopen (3).
|
|
|
|
It implements a stream whose data is stored in a memory buffer.
|
|
|
|
The program writes its command-line arguments to the stream,
|
|
|
|
and then seeks through the stream reading two out of every
|
|
|
|
five characters and writing them to standard output.
|
|
|
|
The following shell session demonstrates the use of the program:
|
|
|
|
.in +4n
|
|
|
|
.nf
|
|
|
|
|
eventfd.2, execve.2, getdents.2, ioprio_set.2, mprotect.2, signalfd.2, timerfd_create.2, wait.2, backtrace.3, clock_getcpuclockid.3, end.3, fmemopen.3, fopencookie.3, frexp.3, getdate.3, getgrouplist.3, getprotoent_r.3, getservent_r.3, gnu_get_libc_version.3, inet.3, inet_pton.3, makecontext.3, malloc.3, matherr.3, offsetof.3, pthread_attr_init.3, pthread_create.3, pthread_getattr_np.3, sem_wait.3, strftime.3, strtok.3, strtol.3, core.5, proc.5, cpuset.7, mq_overview.7: Global fix: Format user input in shell sessions in boldface
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2008-10-28 15:37:22 +00:00
|
|
|
.RB "$" " ./a.out \(aqhello world\(aq"
|
2008-09-09 05:48:00 +00:00
|
|
|
/he/
|
|
|
|
/ w/
|
|
|
|
/d/
|
|
|
|
Reached end of file
|
|
|
|
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
Note that a more general version of the program below
|
|
|
|
could be improved to more robustly handle various error situations
|
|
|
|
(e.g., opening a stream with a cookie that already has an open stream;
|
|
|
|
closing a stream that has already been closed).
|
eventfd.2, getdents.2, mprotect.2, signalfd.2, timerfd_create.2, wait.2, backtrace.3, clock_getcpuclockid.3, end.3, fmemopen.3, fopencookie.3, getdate.3, getgrouplist.3, getprotoent_r.3, getservent_r.3, gnu_get_libc_version.3, inet.3, inet_pton.3, makecontext.3, matherr.3, offsetof.3, pthread_attr_init.3, pthread_create.3, pthread_getattr_np.3, sem_wait.3, strtol.3, core.5: global fix: Add ".SS Program source" to EXAMPLE
Add ".SS Program source" to clearly distinguish shell session and
descriptive text from actual program code.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2008-10-28 15:51:05 +00:00
|
|
|
.SS Program source
|
eventfd.2, getdents.2, mprotect.2, signalfd.2, timerfd_create.2, wait.2, backtrace.3, clock_getcpuclockid.3, end.3, fmemopen.3, fopencookie.3, frexp.3, getaddrinfo.3, getdate.3, getgrouplist.3, getprotoent_r.3, getservent_r.3, gnu_get_libc_version.3, inet.3, inet_pton.3, makecontext.3, matherr.3, offsetof.3, pthread_attr_init.3, pthread_create.3, pthread_getattr_np.3, sem_wait.3, strftime.3, strtok.3, strtol.3, core.5: srcfix
s/\.R " "/\\\&/ as a way of getting a blank line after a .SS heading.
(Suggested by Sam Varshavchik <mrsam@courier-mta.com>)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2008-11-05 01:42:45 +00:00
|
|
|
\&
|
2008-09-09 05:48:00 +00:00
|
|
|
.nf
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
#define INIT_BUF_SIZE 4
|
|
|
|
|
|
|
|
struct memfile_cookie {
|
|
|
|
char *buf; /* Dynamically sized buffer for data */
|
|
|
|
size_t allocated; /* Size of buf */
|
|
|
|
size_t endpos; /* Number of characters in buf */
|
|
|
|
off_t offset; /* Current file offset in buf */
|
|
|
|
};
|
|
|
|
|
|
|
|
ssize_t
|
|
|
|
memfile_write(void *c, const char *buf, size_t size)
|
|
|
|
{
|
|
|
|
char *new_buff;
|
|
|
|
struct memfile_cookie *cookie = c;
|
|
|
|
|
|
|
|
/* Buffer too small? Keep doubling size until big enough */
|
|
|
|
|
ldd.1, execve.2, getdents.2, quotactl.2, select_tut.2, clock_getcpuclockid.3, fopencookie.3, getservent_r.3, matherr.3, mq_notify.3, pthread_create.3, pthread_getattr_np.3, wordexp.3: Global fix: s/-/\\-/ when real hyphen is required (e.g., in code)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-08-29 10:04:28 +00:00
|
|
|
while (size + cookie\->offset > cookie\->allocated) {
|
|
|
|
new_buff = realloc(cookie\->buf, cookie\->allocated * 2);
|
2008-09-09 05:48:00 +00:00
|
|
|
if (new_buff == NULL) {
|
|
|
|
return \-1;
|
|
|
|
} else {
|
|
|
|
cookie\->allocated *= 2;
|
|
|
|
cookie\->buf = new_buff;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
ldd.1, execve.2, getdents.2, quotactl.2, select_tut.2, clock_getcpuclockid.3, fopencookie.3, getservent_r.3, matherr.3, mq_notify.3, pthread_create.3, pthread_getattr_np.3, wordexp.3: Global fix: s/-/\\-/ when real hyphen is required (e.g., in code)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-08-29 10:04:28 +00:00
|
|
|
memcpy(cookie\->buf + cookie\->offset, buf, size);
|
2008-09-09 05:48:00 +00:00
|
|
|
|
|
|
|
cookie\->offset += size;
|
ldd.1, execve.2, getdents.2, quotactl.2, select_tut.2, clock_getcpuclockid.3, fopencookie.3, getservent_r.3, matherr.3, mq_notify.3, pthread_create.3, pthread_getattr_np.3, wordexp.3: Global fix: s/-/\\-/ when real hyphen is required (e.g., in code)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-08-29 10:04:28 +00:00
|
|
|
if (cookie\->offset > cookie\->endpos)
|
|
|
|
cookie\->endpos = cookie\->offset;
|
2008-09-09 05:48:00 +00:00
|
|
|
|
|
|
|
return size;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssize_t
|
|
|
|
memfile_read(void *c, char *buf, size_t size)
|
|
|
|
{
|
|
|
|
ssize_t xbytes;
|
|
|
|
struct memfile_cookie *cookie = c;
|
|
|
|
|
|
|
|
/* Fetch minimum of bytes requested and bytes available */
|
|
|
|
|
|
|
|
xbytes = size;
|
ldd.1, execve.2, getdents.2, quotactl.2, select_tut.2, clock_getcpuclockid.3, fopencookie.3, getservent_r.3, matherr.3, mq_notify.3, pthread_create.3, pthread_getattr_np.3, wordexp.3: Global fix: s/-/\\-/ when real hyphen is required (e.g., in code)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-08-29 10:04:28 +00:00
|
|
|
if (cookie\->offset + size > cookie\->endpos)
|
|
|
|
xbytes = cookie\->endpos \- cookie\->offset;
|
2008-09-09 05:48:00 +00:00
|
|
|
if (xbytes < 0) /* offset may be past endpos */
|
|
|
|
xbytes = 0;
|
|
|
|
|
ldd.1, execve.2, getdents.2, quotactl.2, select_tut.2, clock_getcpuclockid.3, fopencookie.3, getservent_r.3, matherr.3, mq_notify.3, pthread_create.3, pthread_getattr_np.3, wordexp.3: Global fix: s/-/\\-/ when real hyphen is required (e.g., in code)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2012-08-29 10:04:28 +00:00
|
|
|
memcpy(buf, cookie\->buf + cookie\->offset, xbytes);
|
2008-09-09 05:48:00 +00:00
|
|
|
|
|
|
|
cookie\->offset += xbytes;
|
|
|
|
return xbytes;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
memfile_seek(void *c, off64_t *offset, int whence)
|
|
|
|
{
|
|
|
|
off64_t new_offset;
|
|
|
|
struct memfile_cookie *cookie = c;
|
|
|
|
|
|
|
|
if (whence == SEEK_SET)
|
|
|
|
new_offset = *offset;
|
|
|
|
else if (whence == SEEK_END)
|
|
|
|
new_offset = cookie\->endpos + *offset;
|
|
|
|
else if (whence == SEEK_CUR)
|
|
|
|
new_offset = cookie\->offset + *offset;
|
|
|
|
else
|
|
|
|
return \-1;
|
|
|
|
|
|
|
|
if (new_offset < 0)
|
|
|
|
return \-1;
|
|
|
|
|
|
|
|
cookie\->offset = new_offset;
|
|
|
|
*offset = new_offset;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
memfile_close(void *c)
|
|
|
|
{
|
|
|
|
struct memfile_cookie *cookie = c;
|
|
|
|
|
|
|
|
free(cookie\->buf);
|
|
|
|
cookie\->allocated = 0;
|
|
|
|
cookie\->buf = NULL;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
|
|
|
{
|
|
|
|
cookie_io_functions_t memfile_func = {
|
|
|
|
.read = memfile_read,
|
|
|
|
.write = memfile_write,
|
|
|
|
.seek = memfile_seek,
|
|
|
|
.close = memfile_close
|
|
|
|
};
|
|
|
|
FILE *fp;
|
|
|
|
struct memfile_cookie mycookie;
|
|
|
|
ssize_t nread;
|
|
|
|
long p;
|
|
|
|
int j;
|
|
|
|
char buf[1000];
|
|
|
|
|
|
|
|
/* Set up the cookie before calling fopencookie() */
|
|
|
|
|
|
|
|
mycookie.buf = malloc(INIT_BUF_SIZE);
|
|
|
|
if (mycookie.buf == NULL) {
|
|
|
|
perror("malloc");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
mycookie.allocated = INIT_BUF_SIZE;
|
|
|
|
mycookie.offset = 0;
|
|
|
|
mycookie.endpos = 0;
|
|
|
|
|
|
|
|
fp = fopencookie(&mycookie,"w+", memfile_func);
|
|
|
|
if (fp == NULL) {
|
|
|
|
perror("fopencookie");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
2008-09-10 12:39:34 +00:00
|
|
|
/* Write command\-line arguments to our file */
|
2008-09-09 05:48:00 +00:00
|
|
|
|
|
|
|
for (j = 1; j < argc; j++)
|
|
|
|
if (fputs(argv[j], fp) == EOF) {
|
|
|
|
perror("fputs");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read two bytes out of every five, until EOF */
|
|
|
|
|
|
|
|
for (p = 0; ; p += 5) {
|
|
|
|
if (fseek(fp, p, SEEK_SET) == \-1) {
|
|
|
|
perror("fseek");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
nread = fread(buf, 1, 2, fp);
|
|
|
|
if (nread == \-1) {
|
|
|
|
perror("fread");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
if (nread == 0) {
|
|
|
|
printf("Reached end of file\\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
printf("/%.*s/\\n", nread, buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|
|
|
|
.fi
|
|
|
|
.SH SEE ALSO
|
|
|
|
.BR fclose (3),
|
|
|
|
.BR fmemopen (3),
|
|
|
|
.BR fopen (3),
|
getresuid.2, intro.2, mremap.2, open.2, poll.2, posix_fadvise.2, pread.2, remap_file_pages.2, setresuid.2, signal.2, splice.2, sync_file_range.2, tee.2, vmsplice.2, INFINITY.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, dprintf.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, ffs.3, fmemopen.3, fopencookie.3, ftw.3, getdate.3, getline.3, getloadavg.3, getopt.3, getsubopt.3, getutent.3, grantpt.3, hsearch.3, intro.3, lseek64.3, memmem.3, mempcpy.3, mq_receive.3, mq_send.3, posix_fallocate.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, readdir.3, sigset.3, sincos.3, stpcpy.3, stpncpy.3, strchr.3, strfry.3, strnlen.3, strptime.3, strsignal.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlocked_stdio.3, unlockpt.3, wcpcpy.3, wcpncpy.3, wcsdup.3, wcwidth.3: SEE ALSO: Remove redundant reference to feature_test_macros(7)
Reported-by: Florian Lehmann <flo.lehmann@googlemail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 05:05:22 +00:00
|
|
|
.BR fseek (3)
|