2004-11-03 13:51:07 +00:00
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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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2006-02-15 23:15:29 +00:00
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.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
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2007-09-20 06:52:22 +00:00
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.\" and Copyright (c) 2004 by Michael Kerrisk (mtk.manpages@gmail.com)
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2004-11-03 13:51:07 +00:00
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.\"
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.\" 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.\" manual page may be incorrect or out-of-date.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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.\" License.
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.\"
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.\" Modified Sat Jul 24 13:32:44 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Mon Jun 23 14:09:52 1997 by aeb - add EINTR.
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.\" Modified Tue Jul 7 12:26:42 1998 by aeb - changed return value wait3
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2007-09-20 06:52:22 +00:00
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.\" Modified 2004-11-11, Michael Kerrisk <mtk.manpages@gmail.com>
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2007-04-12 22:42:49 +00:00
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.\" Rewrote much of this page, and removed much duplicated text,
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2004-11-11 14:39:29 +00:00
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.\" replacing with pointers to wait.2
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2004-11-03 13:51:07 +00:00
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.\"
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_exit.2, brk.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, getdtablesize.2, gethostname.2, getpagesize.2, getsid.2, killpg.2, mknod.2, mknodat.2, poll.2, posix_fadvise.2, pread.2, readlink.2, setpgid.2, setreuid.2, sigaltstack.2, stat.2, symlink.2, sync.2, truncate.2, vfork.2, wait.2, wait4.2, a64l.3, abs.3, acos.3, acosh.3, asin.3, asinh.3, atan.3, atan2.3, atoi.3, cbrt.3, ceil.3, copysign.3, cosh.3, dirfd.3, div.3, ecvt.3, erf.3, erfc.3, exp.3, exp2.3, fabs.3, fdim.3, ffs.3, floor.3, fma.3, fmax.3, fmin.3, fmod.3, fpclassify.3, frexp.3, ftw.3, fwide.3, gcvt.3, getcwd.3, getdate.3, getgrent.3, gethostid.3, getpass.3, getpwent.3, getsubopt.3, getw.3, hypot.3, ilogb.3, index.3, isalpha.3, isgreater.3, iswblank.3, j0.3, ldexp.3, lockf.3, log.3, log10.3, log1p.3, logb.3, lrint.3, lround.3, mkstemp.3, mktemp.3, modf.3, mq_receive.3, mq_send.3, nan.3, nextafter.3, posix_fallocate.3, posix_memalign.3, printf.3, qecvt.3, random.3, realpath.3, remainder.3, remquo.3, rint.3, round.3, scalb.3, scalbln.3, scanf.3, siginterrupt.3, signbit.3, sigset.3, sinh.3, sqrt.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strfry.3, strpbrk.3, strsep.3, strspn.3, strstr.3, strtod.3, strtok.3, strtol.3, strtoul.3, strxfrm.3, tanh.3, tgamma.3, trunc.3, ttyslot.3, ualarm.3, usleep.3, wprintf.3, armscii-8.7, cp1251.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-3.7, iso_8859-5.7, iso_8859-6.7, iso_8859-8.7, koi8-u.7: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-19 17:19:13 +00:00
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.TH WAIT4 2 2010-09-20 "Linux" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2004-11-11 14:39:29 +00:00
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wait3, wait4 \- wait for process to change state, BSD style
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.SH SYNOPSIS
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.nf
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.B #include <sys/types.h>
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.B #include <sys/time.h>
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.B #include <sys/resource.h>
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.B #include <sys/wait.h>
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2004-11-11 14:39:29 +00:00
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.sp
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2004-11-03 13:51:07 +00:00
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.BI "pid_t wait3(int *" "status" ", int " options ,
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2007-04-03 14:04:54 +00:00
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.BI " struct rusage *" rusage );
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2004-11-03 13:51:07 +00:00
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.sp
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.BI "pid_t wait4(pid_t " pid ", int *" status ", int " options ,
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2007-04-03 14:04:54 +00:00
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.BI " struct rusage *" rusage );
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2004-11-03 13:51:07 +00:00
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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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2010-09-18 09:24:41 +00:00
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.ad l
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2007-07-08 12:11:40 +00:00
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.BR wait3 ():
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2010-09-18 09:24:41 +00:00
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.RS 4
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_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
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_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
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.RE
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2007-07-08 12:11:40 +00:00
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.br
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.BR wait4 ():
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2010-09-18 09:24:41 +00:00
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.RS 4
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_BSD_SOURCE
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.RE
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.ad
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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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2004-11-11 14:39:29 +00:00
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.BR wait3 ()
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and
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.BR wait4 ()
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system calls are similar to
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.BR waitpid (2),
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but additionally return resource usage information about the
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child in the structure pointed to by
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.IR rusage .
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.PP
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Other than the use of the
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.I rusage
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argument, the following
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.BR wait3 ()
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call:
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.nf
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2004-11-03 13:51:07 +00:00
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2004-11-11 14:39:29 +00:00
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wait3(status, options, rusage);
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2004-11-03 13:51:07 +00:00
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2004-11-11 14:39:29 +00:00
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.fi
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is equivalent to:
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.nf
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2005-07-06 12:57:38 +00:00
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waitpid(\-1, status, options);
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2004-11-11 14:39:29 +00:00
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.fi
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Similarly, the following
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.BR wait4 ()
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call:
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.nf
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wait4(pid, status, options, rusage);
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.fi
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is equivalent to:
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.nf
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waitpid(pid, status, options);
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.fi
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In other words,
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.BR wait3 ()
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waits of any child, while
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.BR wait4 ()
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can be used to select a specific child, or children, on which to wait.
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See
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.BR wait (2)
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for further details.
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2004-11-03 13:51:07 +00:00
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.PP
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If
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.I rusage
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2005-11-02 13:55:25 +00:00
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is not NULL, the
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2004-11-11 14:39:29 +00:00
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.I struct rusage
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to which it points will be filled with accounting information
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about the child.
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See
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2004-11-03 13:51:07 +00:00
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.BR getrusage (2)
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for details.
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.SH "RETURN VALUE"
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2004-11-11 14:39:29 +00:00
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As for
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2004-12-13 08:39:28 +00:00
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.BR waitpid (2).
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2004-11-03 13:51:07 +00:00
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.SH ERRORS
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2004-11-11 14:39:29 +00:00
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As for
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2004-12-13 08:39:28 +00:00
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.BR waitpid (2).
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2007-05-18 16:30:46 +00:00
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.SH "CONFORMING TO"
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2008-07-15 13:39:17 +00:00
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4.3BSD.
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2012-09-23 13:50:58 +00:00
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SUSv1 included a specification of
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.BR wait3 ();
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SUSv2 included
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.BR wait3 (),
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but marked it LEGACY;
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SUSv3 removed it.
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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Including
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.I <sys/time.h>
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is not required these days, but increases portability.
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(Indeed,
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.I <sys/resource.h>
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defines the
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.I rusage
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structure with fields of type
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.I struct timeval
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defined in
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.IR <sys/time.h> .)
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2008-09-29 01:51:49 +00:00
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On Linux,
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.BR wait3 ()
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is a library function implemented on top of the
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.BR wait4 ()
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system call.
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2004-11-03 13:51:07 +00:00
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.SH "SEE ALSO"
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2004-11-11 14:39:29 +00:00
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.BR fork (2),
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2004-11-03 13:51:07 +00:00
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.BR getrusage (2),
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2004-11-11 14:39:29 +00:00
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.BR sigaction (2),
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2004-11-03 13:51:07 +00:00
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.BR signal (2),
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.BR wait (2),
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.BR signal (7)
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