1<sys/wait.h>(0P)           POSIX Programmer's Manual          <sys/wait.h>(0P)
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NAME

6       sys/wait.h - declarations for waiting
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SYNOPSIS

9       #include <sys/wait.h>
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DESCRIPTION

12       The  <sys/wait.h>  header shall define the following symbolic constants
13       for use with waitpid():
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15       WNOHANG
16              Do not hang if no status is available; return immediately.
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18       WUNTRACED
19              Report status of stopped child process.
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22       The <sys/wait.h> header shall define the following macros for  analysis
23       of process status values:
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25       WEXITSTATUS
26              Return exit status.
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28       WIFCONTINUED
29              True if child has been continued.
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31       WIFEXITED
32              True if child exited normally.
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34       WIFSIGNALED
35              True if child exited due to uncaught signal.
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37       WIFSTOPPED
38              True if child is currently stopped.
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40       WSTOPSIG
41              Return signal number that caused process to stop.
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43       WTERMSIG
44              Return signal number that caused process to terminate.
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47       The  following  symbolic  constants shall be defined as possible values
48       for the options argument to waitid():
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50       WEXITED
51              Wait for processes that have exited.
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53       WSTOPPED
54              Status is returned for any child that has stopped  upon  receipt
55              of a signal.
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57       WCONTINUED
58              Status  is  returned for any child that was stopped and has been
59              continued.
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61       WNOHANG
62              Return immediately if there are no children to wait for.
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64       WNOWAIT
65              Keep the process whose status is returned in infop in a waitable
66              state.
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69       The  type idtype_t shall be defined as an enumeration type whose possi‐
70       ble values shall include at least the following: P_ALL P_PID P_PGID
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72       The id_t and pid_t types shall be defined as described in <sys/types.h>
73       .
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75       The siginfo_t type shall be defined as described in <signal.h> .
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77       The  rusage structure shall be defined as described in <sys/resource.h>
78       .
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80       Inclusion of the <sys/wait.h> header may also make visible all  symbols
81       from <signal.h> and <sys/resource.h>.
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83       The following shall be declared as functions and may also be defined as
84       macros. Function prototypes shall be provided.
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86
87              pid_t  wait(int *);
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89              int    waitid(idtype_t, id_t, siginfo_t *, int);
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91              pid_t  waitpid(pid_t, int *, int);
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93       The following sections are informative.
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APPLICATION USAGE

96       None.
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RATIONALE

99       None.
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FUTURE DIRECTIONS

102       None.
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SEE ALSO

105       <signal.h>, <sys/resource.h>, <sys/types.h>, the System Interfaces vol‐
106       ume of IEEE Std 1003.1-2001, wait(), waitid()
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109       Portions  of  this text are reprinted and reproduced in electronic form
110       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
111       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
112       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
113       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
114       event of any discrepancy between this version and the original IEEE and
115       The  Open Group Standard, the original IEEE and The Open Group Standard
116       is the referee document. The original Standard can be  obtained  online
117       at http://www.opengroup.org/unix/online.html .
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121IEEE/The Open Group                  2003                     <sys/wait.h>(0P)
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