2004-11-03 13:51:07 +00:00
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.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
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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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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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2008-08-01 05:54:27 +00:00
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.TH FINITE 3 2008-08-05 "" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl \-
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2008-07-23 02:57:20 +00:00
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BSD floating-point classification functions
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.sp
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.BI "int finite(double " x );
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.br
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.BI "int finitef(float " x );
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.br
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.BI "int finitel(long double " x );
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.sp
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.BI "int isinf(double " x );
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.br
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.BI "int isinff(float " x );
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.br
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.BI "int isinfl(long double " x );
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.sp
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.BI "int isnan(double " x );
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.br
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.BI "int isnanf(float " x );
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.br
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.BI "int isnanl(long double " x );
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.fi
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2007-07-08 12:11:40 +00:00
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR finite (),
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.BR finitef (),
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.BR finitel ():
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2010-09-19 04:30:43 +00:00
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.RS 4
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2007-07-08 12:11:40 +00:00
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_BSD_SOURCE || _SVID_SOURCE
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2010-09-19 04:30:43 +00:00
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.RE
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2008-08-01 05:26:15 +00:00
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.BR isinf ():
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2010-09-19 04:30:43 +00:00
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.RS 4
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2008-08-01 05:26:15 +00:00
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_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE;
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2010-09-19 04:30:43 +00:00
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.br
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or
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2008-08-01 05:26:15 +00:00
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.I cc\ -std=c99
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2010-09-19 04:30:43 +00:00
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.RE
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2008-08-01 05:26:15 +00:00
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.br
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2007-07-08 12:11:40 +00:00
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.BR isinff (),
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.BR isinfl ():
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2010-09-19 04:30:43 +00:00
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.RS 4
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2007-07-08 12:11:40 +00:00
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_BSD_SOURCE || _SVID_SOURCE
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2010-09-19 04:30:43 +00:00
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.RE
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2008-08-01 05:26:15 +00:00
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.BR isnan ():
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2010-09-19 04:30:43 +00:00
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.RS 4
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2008-08-01 05:26:15 +00:00
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_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE;
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.br
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2010-09-19 04:30:43 +00:00
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or
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.I cc\ -std=c99
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.RE
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2007-07-08 12:11:40 +00:00
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.BR isnanf (),
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.BR isnanl ():
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2010-09-19 04:30:43 +00:00
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.RS 4
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2008-08-01 05:26:15 +00:00
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_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600
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2010-09-19 04:30:43 +00:00
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.RE
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2007-07-08 12:11:40 +00:00
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.ad b
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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The
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2005-10-19 06:54:38 +00:00
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.BR finite ()
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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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functions return a nonzero value if \fIx\fP is neither infinite
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2004-11-03 13:51:07 +00:00
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nor a "not-a-number" (NaN) value, and 0 otherwise.
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The
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2005-10-19 06:54:38 +00:00
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.BR isnan ()
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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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functions return a nonzero value if \fIx\fP is a NaN value,
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2004-11-03 13:51:07 +00:00
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and 0 otherwise.
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The
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2005-10-19 06:54:38 +00:00
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.BR isinf ()
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2008-08-01 05:26:15 +00:00
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functions return 1 if \fIx\fP is positive infinity, \-1 if \fIx\fP
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2008-07-23 02:54:27 +00:00
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is negative infinity, and 0 otherwise.
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2007-05-16 02:54:18 +00:00
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.SH NOTES
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2007-04-12 22:42:49 +00:00
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Note that these functions are obsolete.
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C99 defines macros
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2007-12-21 12:04:10 +00:00
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.BR isfinite (),
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2007-12-11 07:04:04 +00:00
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.BR isinf (),
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and
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.BR isnan ()
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(for all types) replacing them.
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Further note that the C99
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.BR isinf ()
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has weaker guarantees on the return value.
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2004-11-03 13:51:07 +00:00
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See
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.BR fpclassify (3).
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.\"
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.\" finite* not on HP-UX; they exist on Tru64.
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2007-05-18 11:59:14 +00:00
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.\" .SH HISTORY
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.\" The
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.\" .BR finite ()
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.\" function occurs in 4.3BSD.
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2005-07-18 15:05:56 +00:00
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.\" see IEEE.3 in the 4.3BSD manual
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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2007-07-08 12:11:40 +00:00
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.BR fpclassify (3)
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