2008-07-23 14:06:09 +00:00
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'\" t
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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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2008-07-23 14:06:09 +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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2008-07-23 14:06:09 +00:00
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.\"
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localedef.1, execve.2, fcntl.2, flock.2, lseek.2, open.2, open_by_handle_at.2, recvmmsg.2, sendmmsg.2, seteuid.2, setresuid.2, setreuid.2, setuid.2, statfs.2, syscalls.2, basename.3, catgets.3, getdate.3, getdirentries.3, getdtablesize.3, iconv.3, lockf.3, malloc_get_state.3, malloc_usable_size.3, matherr.3, mkdtemp.3, mkstemp.3, mq_close.3, mq_unlink.3, siginterrupt.3, system.3, locale.5, bootparam.7, environ.7, man-pages.7, signal.7, unicode.7, utf-8.7: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-06-13 15:15:44 +00:00
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.TH MATHERR 3 2014-06-13 "Linux" "Linux Programmer's Manual"
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2008-07-23 14:06:09 +00:00
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.SH NAME
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matherr \- SVID math library exception handling
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.SH SYNOPSIS
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.nf
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accept.2, clone.2, dup.2, fallocate.2, pipe.2, readahead.2, sched_setaffinity.2, unshare.2, CPU_SET.3, endian.3, euidaccess.3, fexecve.3, getpt.3, getpw.3, getumask.3, getutmp.3, gnu_get_libc_version.3, makedev.3, matherr.3, mbsnrtowcs.3, memfrob.3, pthread_attr_setaffinity_np.3, pthread_getattr_np.3, pthread_setaffinity_np.3, pthread_tryjoin_np.3, tcgetsid.3, wcscasecmp.3, wcsncasecmp.3, wcsnlen.3, wcsnrtombs.3, wcswidth.3, rtld-audit.7: SYNOPSIS: Add reference to feature_test_macros(7)
These pages specify feature test macros in the function
prototypes. Add a reference to feature_test_macros(7),
so that readers are pointed to the information that
feature test macros must be defined before including
*any* header file.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-10 05:06:22 +00:00
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.BR "#define _SVID_SOURCE" " /* See feature_test_macros(7) */"
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2008-07-23 14:06:09 +00:00
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.B #include <math.h>
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.BI "int matherr(struct exception *" exc );
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.B extern _LIB_VERSION_TYPE _LIB_VERSION;
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.fi
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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The System V Interface Definition (SVID) specifies that various
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math functions should invoke a function called
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.BR matherr ()
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if a math exception is detected.
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This function is called before the math function returns;
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after
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.BR matherr ()
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returns, the system then returns to the math function,
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which in turn returns to the caller.
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The
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.BR matherr ()
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mechanism is supported by glibc, but is now obsolete:
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new applications should use the techniques described in
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.BR math_error (7)
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and
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.BR fenv (3).
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This page documents the glibc
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.BR matherr ()
|
|
|
|
mechanism as an aid for maintaining and porting older applications.
|
|
|
|
|
|
|
|
To employ
|
|
|
|
.BR matherr (),
|
|
|
|
the programmer must define the
|
|
|
|
.B _SVID_SOURCE
|
2010-09-10 04:33:31 +00:00
|
|
|
feature test macro
|
|
|
|
(before including
|
|
|
|
.I any
|
|
|
|
header files),
|
|
|
|
and assign the value
|
2008-07-23 14:06:09 +00:00
|
|
|
.B _SVID_
|
|
|
|
to the external variable
|
|
|
|
.BR _LIB_VERSION .
|
|
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|
|
|
The system provides a default version of
|
|
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|
.BR matherr ().
|
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|
|
This version does nothing, and returns zero
|
|
|
|
(see below for the significance of this).
|
|
|
|
The default
|
|
|
|
.BR matherr ()
|
|
|
|
can be overridden by a programmer-defined
|
|
|
|
version, which will be invoked when an exception occurs.
|
|
|
|
The function is invoked with one argument, a pointer to an
|
|
|
|
.I exception
|
|
|
|
structure, defined as follows:
|
|
|
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|
.in +4n
|
|
|
|
.nf
|
|
|
|
struct exception {
|
|
|
|
int type; /* Exception type */
|
|
|
|
char *name; /* Name of function causing exception */
|
|
|
|
double arg1; /* 1st argument to function */
|
|
|
|
double arg2; /* 2nd argument to function */
|
|
|
|
double retval; /* Function return value */
|
|
|
|
}
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
.PP
|
|
|
|
The
|
|
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|
.I type
|
|
|
|
field has one of the following values:
|
|
|
|
.TP 12
|
|
|
|
.B DOMAIN
|
|
|
|
A domain error occurred (the function argument was outside the range
|
|
|
|
for which the function is defined).
|
|
|
|
The return value depends on the function;
|
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR EDOM .
|
|
|
|
.TP
|
|
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|
.B SING
|
|
|
|
A pole error occurred (the function result is an infinity).
|
|
|
|
The return value in most cases is
|
|
|
|
.B HUGE
|
|
|
|
(the largest single precision floating-point number),
|
|
|
|
appropriately signed.
|
|
|
|
In most cases,
|
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR EDOM .
|
|
|
|
.TP
|
|
|
|
.B OVERFLOW
|
|
|
|
An overflow occurred.
|
|
|
|
In most cases, the value
|
|
|
|
.B HUGE
|
|
|
|
is returned, and
|
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR ERANGE .
|
|
|
|
.TP
|
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|
.B UNDERFLOW
|
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|
|
An underflow occurred.
|
|
|
|
0.0 is returned, and
|
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR ERANGE .
|
|
|
|
.TP
|
|
|
|
.B TLOSS
|
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|
|
Total loss of significance.
|
|
|
|
0.0 is returned, and
|
|
|
|
.I errno
|
|
|
|
is set to
|
|
|
|
.BR ERANGE .
|
|
|
|
.TP
|
|
|
|
.B PLOSS
|
|
|
|
Partial loss of significance.
|
|
|
|
This value is unused on glibc
|
|
|
|
(and many other systems).
|
|
|
|
.PP
|
|
|
|
The
|
|
|
|
.I arg1
|
|
|
|
and
|
|
|
|
.I arg2
|
|
|
|
fields are the arguments supplied to the function
|
|
|
|
.RI ( arg2
|
|
|
|
is undefined for functions that take only one argument).
|
|
|
|
|
|
|
|
The
|
|
|
|
.I retval
|
|
|
|
field specifies the return value that the math
|
|
|
|
function will return to its caller.
|
|
|
|
The programmer-defined
|
|
|
|
.BR matherr ()
|
|
|
|
can modify this field to change the return value of the math function.
|
|
|
|
|
|
|
|
If the
|
|
|
|
.BR matherr ()
|
|
|
|
function returns zero, then the system sets
|
|
|
|
.I errno
|
|
|
|
as described above, and may print an error message on standard error
|
|
|
|
(see below).
|
|
|
|
|
|
|
|
If the
|
|
|
|
.BR matherr ()
|
intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.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, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.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_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
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 16:40:55 +00:00
|
|
|
function returns a nonzero value, then the system does not set
|
2008-07-23 14:06:09 +00:00
|
|
|
.IR errno ,
|
|
|
|
and doesn't print an error message.
|
|
|
|
.SS Math functions that employ matherr()
|
|
|
|
The table below lists the functions and circumstances in which
|
|
|
|
.BR matherr ()
|
|
|
|
is called.
|
|
|
|
The "Type" column indicates the value assigned to
|
|
|
|
.I exc\->type
|
|
|
|
when calling
|
|
|
|
.BR matherr ().
|
|
|
|
The "Result" column is the default return value assigned to
|
|
|
|
.IR exc\->retval .
|
|
|
|
|
|
|
|
The "Msg?" and "errno" columns describe the default behavior if
|
|
|
|
.BR matherr ()
|
|
|
|
returns zero.
|
|
|
|
If the "Msg?" columns contains "y",
|
|
|
|
then the system prints an error message on standard error.
|
|
|
|
|
|
|
|
The table uses the following notations and abbreviations:
|
|
|
|
.RS
|
|
|
|
.nf
|
|
|
|
|
|
|
|
x first argument to function
|
|
|
|
y second argument to function
|
|
|
|
fin finite value for argument
|
|
|
|
neg negative value for argument
|
|
|
|
int integral value for argument
|
|
|
|
o/f result overflowed
|
|
|
|
u/f result underflowed
|
|
|
|
|x| absolute value of x
|
|
|
|
X_TLOSS is a constant defined in \fI<math.h>\fP
|
|
|
|
.fi
|
|
|
|
.RE
|
|
|
|
.\" Details below from glibc 2.8's sysdeps/ieee754/k_standard.c
|
|
|
|
.\" A subset of cases were test by experimental programs.
|
|
|
|
.TS
|
|
|
|
lB lB lB cB lB
|
|
|
|
l l l c l.
|
|
|
|
Function Type Result Msg? errno
|
|
|
|
acos(|x|>1) DOMAIN HUGE y EDOM
|
|
|
|
asin(|x|>1) DOMAIN HUGE y EDOM
|
|
|
|
atan2(0,0) DOMAIN HUGE y EDOM
|
2012-05-06 21:33:31 +00:00
|
|
|
acosh(x<1) DOMAIN NAN y EDOM \" retval is 0.0/0.0
|
|
|
|
atanh(|x|>1) DOMAIN NAN y EDOM \" retval is 0.0/0.0
|
|
|
|
atanh(|x|==1) SING (x>0.0)? y EDOM \" retval is x/0.0
|
2008-07-23 14:06:09 +00:00
|
|
|
\ \ HUGE_VAL :
|
|
|
|
\ \ \-HUGE_VAL
|
|
|
|
cosh(fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
sinh(fin) o/f OVERFLOW (x>0.0) ? n ERANGE
|
|
|
|
\ \ HUGE : \-HUGE
|
|
|
|
sqrt(x<0) DOMAIN 0.0 y EDOM
|
|
|
|
hypot(fin,fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
exp(fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
exp(fin) u/f UNDERFLOW 0.0 n ERANGE
|
|
|
|
exp2(fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
exp2(fin) u/f UNDERFLOW 0.0 n ERANGE
|
|
|
|
exp10(fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
exp10(fin) u/f UNDERFLOW 0.0 n ERANGE
|
|
|
|
j0(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
j1(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
jn(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
y0(x>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
y1(x>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
yn(x>X_TLOSS) TLOSS 0.0 y ERANGE
|
|
|
|
y0(0) DOMAIN \-HUGE y EDOM
|
|
|
|
y0(x<0) DOMAIN \-HUGE y EDOM
|
|
|
|
y1(0) DOMAIN \-HUGE y EDOM
|
|
|
|
y1(x<0) DOMAIN \-HUGE y EDOM
|
|
|
|
yn(n,0) DOMAIN \-HUGE y EDOM
|
|
|
|
yn(x<0) DOMAIN \-HUGE y EDOM
|
|
|
|
lgamma(fin) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
lgamma(\-int) or SING HUGE y EDOM
|
|
|
|
\ \ lgamma(0)
|
|
|
|
tgamma(fin) o/f OVERFLOW HUGE_VAL n ERANGE
|
|
|
|
tgamma(\-int) SING NAN y EDOM
|
|
|
|
tgamma(0) SING copysign( y ERANGE
|
|
|
|
\ \ HUGE_VAL,x)
|
|
|
|
log(0) SING \-HUGE y EDOM
|
|
|
|
log(x<0) DOMAIN \-HUGE y EDOM
|
|
|
|
log2(0) SING \-HUGE n EDOM \" different from log()
|
fallocate.2, kexec_load.2, poll.2, spu_run.2, atan2.3, cbrt.3, clock_getcpuclockid.3, end.3, frexp.3, getgrouplist.3, getifaddrs.3, matherr.3, modf.3, pow.3, pthread_getattr_np.3, pthread_getcpuclockid.3, sched_getcpu.3, tgamma.3, mouse.4, proc.5, feature_test_macros.7, spufs.7: Global fix: properly escape minus sign
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-10 01:57:53 +00:00
|
|
|
log2(x<0) DOMAIN \-HUGE n EDOM \" different from log()
|
2008-07-23 14:06:09 +00:00
|
|
|
log10(0) SING \-HUGE y EDOM
|
|
|
|
log10(x<0) DOMAIN \-HUGE y EDOM
|
|
|
|
pow(0.0,0.0) DOMAIN 0.0 y EDOM
|
|
|
|
pow(x,y) o/f OVERFLOW HUGE n ERANGE
|
|
|
|
pow(x,y) u/f UNDERFLOW 0.0 n ERANGE
|
|
|
|
pow(NaN,0.0) DOMAIN x n EDOM
|
|
|
|
0**neg DOMAIN 0.0 y EDOM \" +0 and -0
|
|
|
|
neg**non-int DOMAIN 0.0 y EDOM
|
|
|
|
scalb() o/f OVERFLOW (x>0.0) ? n ERANGE
|
|
|
|
\ \ HUGE_VAL :
|
|
|
|
\ \ \-HUGE_VAL
|
|
|
|
scalb() u/f UNDERFLOW copysign( n ERANGE
|
|
|
|
\ \ \ \ 0.0,x)
|
|
|
|
fmod(x,0) DOMAIN x y EDOM
|
2012-05-06 21:33:31 +00:00
|
|
|
remainder(x,0) DOMAIN NAN y EDOM \" retval is 0.0/0.0
|
2008-07-23 14:06:09 +00:00
|
|
|
.TE
|
2014-06-11 08:21:13 +00:00
|
|
|
.SH ATTRIBUTES
|
|
|
|
.SS Multithreading (see pthreads(7))
|
|
|
|
The
|
|
|
|
.BR matherr ()
|
|
|
|
function is thread-safe.
|
2008-07-23 14:06:09 +00:00
|
|
|
.SH EXAMPLE
|
|
|
|
The example program demonstrates the use of
|
|
|
|
.BR matherr ()
|
|
|
|
when calling
|
|
|
|
.BR log (3).
|
|
|
|
The program takes up to three command-line arguments.
|
|
|
|
The first argument is the floating-point number to be given to
|
|
|
|
.BR log (3).
|
|
|
|
If the optional second argument is provided, then
|
|
|
|
.B _LIB_VERSION
|
|
|
|
is set to
|
|
|
|
.B _SVID_
|
|
|
|
so that
|
|
|
|
.BR matherr ()
|
|
|
|
is called, and the integer supplied in the
|
|
|
|
command-line argument is used as the return value from
|
|
|
|
.BR matherr ().
|
|
|
|
If the optional third command-line argument is supplied,
|
|
|
|
then it specifies an alternative return value that
|
|
|
|
.BR matherr ()
|
|
|
|
should assign as the return value of the math function.
|
|
|
|
|
|
|
|
The following example run, where
|
|
|
|
.BR log (3)
|
|
|
|
is given an argument of 0.0, does not use
|
2011-09-23 05:11:27 +00:00
|
|
|
.BR matherr ():
|
2008-07-23 14:06:09 +00:00
|
|
|
|
|
|
|
.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 "$" " ./a.out 0.0"
|
2008-07-23 14:06:09 +00:00
|
|
|
errno: Numerical result out of range
|
|
|
|
x=-inf
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
|
|
|
|
In the following run,
|
|
|
|
.BR matherr ()
|
|
|
|
is called, and returns 0:
|
|
|
|
|
|
|
|
.in +4n
|
|
|
|
.nf
|
eventfd.2, execve.2, getdents.2, ioprio_set.2, mprotect.2, signalfd.2, timerfd_create.2, wait.2, backtrace.3, clock_getcpuclockid.3, end.3, fmemopen.3, fopencookie.3, frexp.3, getdate.3, getgrouplist.3, getprotoent_r.3, getservent_r.3, gnu_get_libc_version.3, inet.3, inet_pton.3, makecontext.3, malloc.3, matherr.3, offsetof.3, pthread_attr_init.3, pthread_create.3, pthread_getattr_np.3, sem_wait.3, strftime.3, strtok.3, strtol.3, core.5, proc.5, cpuset.7, mq_overview.7: Global fix: Format user input in shell sessions in boldface
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2008-10-28 15:37:22 +00:00
|
|
|
.RB "$" " ./a.out 0.0 0"
|
2008-07-23 14:06:09 +00:00
|
|
|
matherr SING exception in log() function
|
|
|
|
args: 0.000000, 0.000000
|
fallocate.2, kexec_load.2, poll.2, spu_run.2, atan2.3, cbrt.3, clock_getcpuclockid.3, end.3, frexp.3, getgrouplist.3, getifaddrs.3, matherr.3, modf.3, pow.3, pthread_getattr_np.3, pthread_getcpuclockid.3, sched_getcpu.3, tgamma.3, mouse.4, proc.5, feature_test_macros.7, spufs.7: Global fix: properly escape minus sign
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-10 01:57:53 +00:00
|
|
|
retval: \-340282346638528859811704183484516925440.000000
|
2008-07-23 14:06:09 +00:00
|
|
|
log: SING error
|
|
|
|
errno: Numerical argument out of domain
|
|
|
|
x=-340282346638528859811704183484516925440.000000
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
|
|
|
|
The message "log: SING error" was printed by the C library.
|
|
|
|
|
|
|
|
In the following run,
|
|
|
|
.BR matherr ()
|
intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.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, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.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_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
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 16:40:55 +00:00
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is called, and returns a nonzero value:
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2008-07-23 14:06:09 +00:00
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.in +4n
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.nf
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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
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.RB "$" " ./a.out 0.0 1"
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2008-07-23 14:06:09 +00:00
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matherr SING exception in log() function
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args: 0.000000, 0.000000
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fallocate.2, kexec_load.2, poll.2, spu_run.2, atan2.3, cbrt.3, clock_getcpuclockid.3, end.3, frexp.3, getgrouplist.3, getifaddrs.3, matherr.3, modf.3, pow.3, pthread_getattr_np.3, pthread_getcpuclockid.3, sched_getcpu.3, tgamma.3, mouse.4, proc.5, feature_test_macros.7, spufs.7: Global fix: properly escape minus sign
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-10 01:57:53 +00:00
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retval: \-340282346638528859811704183484516925440.000000
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2008-07-23 14:06:09 +00:00
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x=-340282346638528859811704183484516925440.000000
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.fi
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.in
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In this case, the C library did not print a message, and
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.I errno
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was not set.
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In the following run,
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.BR matherr ()
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is called, changes the return value of the math function,
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intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.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, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.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_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
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 16:40:55 +00:00
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and returns a nonzero value:
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2008-07-23 14:06:09 +00:00
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.in +4n
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.nf
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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
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.RB "$" " ./a.out 0.0 1 12345.0"
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2008-07-23 14:06:09 +00:00
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matherr SING exception in log() function
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args: 0.000000, 0.000000
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fallocate.2, kexec_load.2, poll.2, spu_run.2, atan2.3, cbrt.3, clock_getcpuclockid.3, end.3, frexp.3, getgrouplist.3, getifaddrs.3, matherr.3, modf.3, pow.3, pthread_getattr_np.3, pthread_getcpuclockid.3, sched_getcpu.3, tgamma.3, mouse.4, proc.5, feature_test_macros.7, spufs.7: Global fix: properly escape minus sign
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2011-09-10 01:57:53 +00:00
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retval: \-340282346638528859811704183484516925440.000000
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2008-07-23 14:06:09 +00:00
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x=12345.000000
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.fi
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.in
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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
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.SS Program source
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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
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\&
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2008-07-23 14:06:09 +00:00
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.nf
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#define _SVID_SOURCE
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#include <errno.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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static int matherr_ret = 0; /* Value that matherr()
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should return */
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static int change_retval = 0; /* Should matherr() change
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function\(aqs return value? */
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static double new_retval; /* New function return value */
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int
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matherr(struct exception *exc)
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{
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fprintf(stderr, "matherr %s exception in %s() function\\n",
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(exc\->type == DOMAIN) ? "DOMAIN" :
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(exc\->type == OVERFLOW) ? "OVERFLOW" :
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(exc\->type == UNDERFLOW) ? "UNDERFLOW" :
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(exc\->type == SING) ? "SING" :
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(exc\->type == TLOSS) ? "TLOSS" :
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(exc\->type == PLOSS) ? "PLOSS" : "???",
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exc\->name);
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fprintf(stderr, " args: %f, %f\\n",
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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
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exc\->arg1, exc\->arg2);
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2008-07-23 14:06:09 +00:00
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fprintf(stderr, " retval: %f\\n", exc\->retval);
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if (change_retval)
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exc\->retval = new_retval;
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return matherr_ret;
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}
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int
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main(int argc, char *argv[])
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{
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double x;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <argval>"
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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
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" [<matherr\-ret> [<new\-func\-retval>]]\\n", argv[0]);
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2008-07-23 14:06:09 +00:00
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exit(EXIT_FAILURE);
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}
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if (argc > 2) {
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_LIB_VERSION = _SVID_;
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matherr_ret = atoi(argv[2]);
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}
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if (argc > 3) {
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change_retval = 1;
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new_retval = atof(argv[3]);
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}
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x = log(atof(argv[1]));
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if (errno != 0)
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perror("errno");
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printf("x=%f\\n", x);
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exit(EXIT_SUCCESS);
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}
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.fi
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.SH SEE ALSO
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.BR fenv (3),
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.BR math_error (7),
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.BR standards (7)
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