1 .\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
2 .\" and Copyright (c) 2004 by Michael Kerrisk <mtk.manpages@gmail.com>
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26 .\" Modified Sat Jul 24 13:32:44 1993 by Rik Faith (faith@cs.unc.edu)
27 .\" Modified Mon Jun 23 14:09:52 1997 by aeb - add EINTR.
28 .\" Modified Tue Jul 7 12:26:42 1998 by aeb - changed return value wait3
29 .\" Modified 2004-11-11, Michael Kerrisk <mtk.manpages@gmail.com>
30 .\" Rewrote much of this page, and removed much duplicated text,
31 .\" replacing with pointers to wait.2
33 .TH WAIT4 2 2018-04-30 "Linux" "Linux Programmer's Manual"
35 wait3, wait4 \- wait for process to change state, BSD style
38 .B #include <sys/types.h>
39 .B #include <sys/time.h>
40 .B #include <sys/resource.h>
41 .B #include <sys/wait.h>
43 .BI "pid_t wait3(int *" "wstatus" ", int " options ,
44 .BI " struct rusage *" rusage );
46 .BI "pid_t wait4(pid_t " pid ", int *" wstatus ", int " options ,
47 .BI " struct rusage *" rusage );
51 Feature Test Macro Requirements for glibc (see
52 .BR feature_test_macros (7)):
59 (_XOPEN_SOURCE\ >=\ 500 &&
60 ! (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600))
61 From glibc 2.19 to 2.25:
62 _DEFAULT_SOURCE || _XOPEN_SOURCE\ >=\ 500
63 Glibc 2.19 and earlier:
64 _BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
65 .\" || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
70 Glibc 2.19 and earlier:
74 These functions are nonstandard; in new programs, the use of
84 system calls are similar to
86 but additionally return resource usage information about the
87 child in the structure pointed to by
90 Other than the use of the
92 argument, the following
98 wait3(wstatus, options, rusage);
106 waitpid(\-1, wstatus, options);
110 Similarly, the following
116 wait4(pid, wstatus, options, rusage);
124 waitpid(pid, wstatus, options);
130 waits of any child, while
132 can be used to select a specific child, or children, on which to wait.
141 to which it points will be filled with accounting information
155 SUSv1 included a specification of
159 but marked it LEGACY;
164 is not required these days, but increases portability.
169 structure with fields of type
173 .SS C library/kernel differences
176 is a library function implemented on top of the