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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.\" 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.\" manual page may be incorrect or out-of-date.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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.\"
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2010-09-10 04:33:31 +00:00
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.TH MATHERR 3 2010-09-10 "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 ()
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mechanism as an aid for maintaining and porting older applications.
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To employ
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.BR matherr (),
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the programmer must define the
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.B _SVID_SOURCE
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2010-09-10 04:33:31 +00:00
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feature test macro
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(before including
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.I any
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header files),
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and assign the value
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2008-07-23 14:06:09 +00:00
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.B _SVID_
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to the external variable
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.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
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(see below for the significance of this).
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The default
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.BR matherr ()
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can be overridden by a programmer-defined
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version, which will be invoked when an exception occurs.
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The function is invoked with one argument, a pointer to an
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.I exception
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structure, defined as follows:
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.in +4n
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.nf
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struct exception {
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int type; /* Exception type */
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char *name; /* Name of function causing exception */
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double arg1; /* 1st argument to function */
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double arg2; /* 2nd argument to function */
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double retval; /* Function return value */
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}
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.fi
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.in
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.PP
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The
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.I type
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field has one of the following values:
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.TP 12
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.B DOMAIN
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A domain error occurred (the function argument was outside the range
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for which the function is defined).
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The return value depends on the function;
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.I errno
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is set to
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.BR EDOM .
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.TP
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.B SING
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A pole error occurred (the function result is an infinity).
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The return value in most cases is
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.B HUGE
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(the largest single precision floating-point number),
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appropriately signed.
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In most cases,
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.I errno
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is set to
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.BR EDOM .
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.TP
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.B OVERFLOW
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An overflow occurred.
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In most cases, the value
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.B HUGE
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is returned, and
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.I errno
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is set to
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.BR ERANGE .
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.TP
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.B UNDERFLOW
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An underflow occurred.
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0.0 is returned, and
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.I errno
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is set to
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.BR ERANGE .
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.TP
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.B TLOSS
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Total loss of significance.
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0.0 is returned, and
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.I errno
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is set to
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.BR ERANGE .
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.TP
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.B PLOSS
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Partial loss of significance.
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This value is unused on glibc
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(and many other systems).
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.PP
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The
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.I arg1
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and
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.I arg2
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fields are the arguments supplied to the function
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.RI ( arg2
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is undefined for functions that take only one argument).
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The
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.I retval
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field specifies the return value that the math
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function will return to its caller.
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The programmer-defined
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.BR matherr ()
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can modify this field to change the return value of the math function.
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If the
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.BR matherr ()
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function returns zero, then the system sets
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.I errno
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as described above, and may print an error message on standard error
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(see below).
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If the
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.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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function returns a nonzero value, then the system does not set
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2008-07-23 14:06:09 +00:00
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.IR errno ,
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and doesn't print an error message.
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.SS Math functions that employ matherr()
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The table below lists the functions and circumstances in which
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.BR matherr ()
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is called.
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The "Type" column indicates the value assigned to
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.I exc\->type
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when calling
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.BR matherr ().
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The "Result" column is the default return value assigned to
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.IR exc\->retval .
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The "Msg?" and "errno" columns describe the default behavior if
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.BR matherr ()
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returns zero.
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If the "Msg?" columns contains "y",
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then the system prints an error message on standard error.
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The table uses the following notations and abbreviations:
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.RS
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.nf
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x first argument to function
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y second argument to function
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fin finite value for argument
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neg negative value for argument
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int integral value for argument
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o/f result overflowed
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u/f result underflowed
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|x| absolute value of x
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X_TLOSS is a constant defined in \fI<math.h>\fP
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.fi
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.RE
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.\" Details below from glibc 2.8's sysdeps/ieee754/k_standard.c
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.\" A subset of cases were test by experimental programs.
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.TS
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lB lB lB cB lB
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l l l c l.
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Function Type Result Msg? errno
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acos(|x|>1) DOMAIN HUGE y EDOM
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asin(|x|>1) DOMAIN HUGE y EDOM
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atan2(0,0) DOMAIN HUGE y EDOM
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acosh(x<1) DOMAIN NAN y EDOM \" retval is 0.0/0.0
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atanh(|x|>1) DOMAIN NAN y EDOM \" retval is 0.0/0.0
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atanh(|x|==1) SING (x>0.0)? y EDOM \" retval is x/0.0
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\ \ HUGE_VAL :
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\ \ \-HUGE_VAL
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cosh(fin) o/f OVERFLOW HUGE n ERANGE
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sinh(fin) o/f OVERFLOW (x>0.0) ? n ERANGE
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\ \ HUGE : \-HUGE
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sqrt(x<0) DOMAIN 0.0 y EDOM
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hypot(fin,fin) o/f OVERFLOW HUGE n ERANGE
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exp(fin) o/f OVERFLOW HUGE n ERANGE
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exp(fin) u/f UNDERFLOW 0.0 n ERANGE
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exp2(fin) o/f OVERFLOW HUGE n ERANGE
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exp2(fin) u/f UNDERFLOW 0.0 n ERANGE
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exp10(fin) o/f OVERFLOW HUGE n ERANGE
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exp10(fin) u/f UNDERFLOW 0.0 n ERANGE
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j0(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
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j1(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
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jn(|x|>X_TLOSS) TLOSS 0.0 y ERANGE
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y0(x>X_TLOSS) TLOSS 0.0 y ERANGE
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y1(x>X_TLOSS) TLOSS 0.0 y ERANGE
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yn(x>X_TLOSS) TLOSS 0.0 y ERANGE
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y0(0) DOMAIN \-HUGE y EDOM
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y0(x<0) DOMAIN \-HUGE y EDOM
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y1(0) DOMAIN \-HUGE y EDOM
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y1(x<0) DOMAIN \-HUGE y EDOM
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yn(n,0) DOMAIN \-HUGE y EDOM
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yn(x<0) DOMAIN \-HUGE y EDOM
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lgamma(fin) o/f OVERFLOW HUGE n ERANGE
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lgamma(\-int) or SING HUGE y EDOM
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\ \ lgamma(0)
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tgamma(fin) o/f OVERFLOW HUGE_VAL n ERANGE
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tgamma(\-int) SING NAN y EDOM
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tgamma(0) SING copysign( y ERANGE
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\ \ HUGE_VAL,x)
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log(0) SING \-HUGE y EDOM
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log(x<0) DOMAIN \-HUGE y EDOM
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log2(0) SING \-HUGE n EDOM \" different from log()
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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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log2(x<0) DOMAIN \-HUGE n EDOM \" different from log()
|
2008-07-23 14:06:09 +00:00
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log10(0) SING \-HUGE y EDOM
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log10(x<0) DOMAIN \-HUGE y EDOM
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pow(0.0,0.0) DOMAIN 0.0 y EDOM
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pow(x,y) o/f OVERFLOW HUGE n ERANGE
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pow(x,y) u/f UNDERFLOW 0.0 n ERANGE
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pow(NaN,0.0) DOMAIN x n EDOM
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0**neg DOMAIN 0.0 y EDOM \" +0 and -0
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neg**non-int DOMAIN 0.0 y EDOM
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scalb() o/f OVERFLOW (x>0.0) ? n ERANGE
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\ \ HUGE_VAL :
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\ \ \-HUGE_VAL
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scalb() u/f UNDERFLOW copysign( n ERANGE
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\ \ \ \ 0.0,x)
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fmod(x,0) DOMAIN x y EDOM
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remainder(x,0) DOMAIN NAN y EDOM \" retval is 0.0/0.0
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.TE
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.SH EXAMPLE
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|
The example program demonstrates the use of
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.BR matherr ()
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when calling
|
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.BR log (3).
|
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|
The program takes up to three command-line arguments.
|
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|
The first argument is the floating-point number to be given to
|
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.BR log (3).
|
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|
If the optional second argument is provided, then
|
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.B _LIB_VERSION
|
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is set to
|
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.B _SVID_
|
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so that
|
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.BR matherr ()
|
|
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|
is called, and the integer supplied in the
|
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|
command-line argument is used as the return value from
|
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|
|
.BR matherr ().
|
|
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|
If the optional third command-line argument is supplied,
|
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|
then it specifies an alternative return value that
|
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|
.BR matherr ()
|
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|
should assign as the return value of the math function.
|
|
|
|
|
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|
The following example run, where
|
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.BR log (3)
|
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|
|
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
|
|
|
is called, and returns a nonzero value:
|
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 1"
|
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
|
|
|
x=-340282346638528859811704183484516925440.000000
|
|
|
|
.fi
|
|
|
|
.in
|
|
|
|
|
|
|
|
In this case, the C library did not print a message, and
|
|
|
|
.I errno
|
|
|
|
was not set.
|
|
|
|
|
|
|
|
In the following run,
|
|
|
|
.BR matherr ()
|
|
|
|
is called, changes the return value of the math function,
|
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
|
|
|
and returns a nonzero value:
|
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 1 12345.0"
|
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
|
|
|
x=12345.000000
|
|
|
|
.fi
|
|
|
|
.in
|
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
|
|
|
\&
|
2008-07-23 14:06:09 +00:00
|
|
|
.nf
|
|
|
|
#define _SVID_SOURCE
|
|
|
|
#include <errno.h>
|
|
|
|
#include <math.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
|
|
|
static int matherr_ret = 0; /* Value that matherr()
|
|
|
|
should return */
|
|
|
|
static int change_retval = 0; /* Should matherr() change
|
|
|
|
function\(aqs return value? */
|
|
|
|
static double new_retval; /* New function return value */
|
|
|
|
|
|
|
|
int
|
|
|
|
matherr(struct exception *exc)
|
|
|
|
{
|
|
|
|
fprintf(stderr, "matherr %s exception in %s() function\\n",
|
|
|
|
(exc\->type == DOMAIN) ? "DOMAIN" :
|
|
|
|
(exc\->type == OVERFLOW) ? "OVERFLOW" :
|
|
|
|
(exc\->type == UNDERFLOW) ? "UNDERFLOW" :
|
|
|
|
(exc\->type == SING) ? "SING" :
|
|
|
|
(exc\->type == TLOSS) ? "TLOSS" :
|
|
|
|
(exc\->type == PLOSS) ? "PLOSS" : "???",
|
|
|
|
exc\->name);
|
|
|
|
fprintf(stderr, " args: %f, %f\\n",
|
|
|
|
exc\->arg1, exc->arg2);
|
|
|
|
fprintf(stderr, " retval: %f\\n", exc\->retval);
|
|
|
|
|
|
|
|
if (change_retval)
|
|
|
|
exc\->retval = new_retval;
|
|
|
|
|
|
|
|
return matherr_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
|
|
|
{
|
|
|
|
double x;
|
|
|
|
|
|
|
|
if (argc < 2) {
|
|
|
|
fprintf(stderr, "Usage: %s <argval>"
|
|
|
|
" [<matherr\-ret> [<new\-func-retval>]]\\n", argv[0]);
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (argc > 2) {
|
|
|
|
_LIB_VERSION = _SVID_;
|
|
|
|
matherr_ret = atoi(argv[2]);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (argc > 3) {
|
|
|
|
change_retval = 1;
|
|
|
|
new_retval = atof(argv[3]);
|
|
|
|
}
|
|
|
|
|
|
|
|
x = log(atof(argv[1]));
|
|
|
|
if (errno != 0)
|
|
|
|
perror("errno");
|
|
|
|
|
|
|
|
printf("x=%f\\n", x);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
|
|
}
|
|
|
|
.fi
|
|
|
|
.SH SEE ALSO
|
|
|
|
.BR fenv (3),
|
|
|
|
.BR math_error (7),
|
|
|
|
.BR standards (7)
|