mirror of https://github.com/mkerrisk/man-pages
123 lines
3.2 KiB
Plaintext
123 lines
3.2 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "<sys/wait.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" <sys/wait.h>
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.SH NAME
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sys/wait.h \- declarations for waiting
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.SH SYNOPSIS
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.LP
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\fB#include <sys/wait.h>\fP
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.SH DESCRIPTION
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.LP
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The \fI<sys/wait.h>\fP header shall define the following symbolic
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constants for use with \fIwaitpid\fP():
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.TP 7
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WNOHANG
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Do not hang if no status is available; return immediately.
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.TP 7
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WUNTRACED
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Report status of stopped child process.
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.sp
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.LP
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The \fI<sys/wait.h>\fP header shall define the following macros for
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analysis of process status values:
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.TP 7
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WEXITSTATUS
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Return exit status.
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.TP 7
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WIFCONTINUED
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True if child has been continued.
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.TP 7
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WIFEXITED
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True if child exited normally.
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.TP 7
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WIFSIGNALED
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True if child exited due to uncaught signal.
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.TP 7
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WIFSTOPPED
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True if child is currently stopped.
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.TP 7
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WSTOPSIG
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Return signal number that caused process to stop.
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.TP 7
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WTERMSIG
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Return signal number that caused process to terminate.
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.sp
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.LP
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The following symbolic constants shall be defined as possible values
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for the \fIoptions\fP argument to \fIwaitid\fP():
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.TP 7
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WEXITED
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Wait for processes that have exited.
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.TP 7
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WSTOPPED
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Status is returned for any child that has stopped upon receipt of
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a signal.
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.TP 7
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WCONTINUED
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Status is returned for any child that was stopped and has been continued.
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.TP 7
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WNOHANG
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Return immediately if there are no children to wait for.
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.TP 7
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WNOWAIT
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Keep the process whose status is returned in \fIinfop\fP in a waitable
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state.
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.sp
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.LP
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The type \fBidtype_t\fP shall be defined as an enumeration type whose
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possible values shall include at least the following:
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P_ALL P_PID P_PGID
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.LP
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The \fBid_t\fP and \fBpid_t\fP types shall be defined as described
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in \fI<sys/types.h>\fP .
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.LP
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The \fBsiginfo_t\fP type shall be defined as described in \fI<signal.h>\fP
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\&.
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.LP
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The \fBrusage\fP structure shall be defined as described in \fI<sys/resource.h>\fP
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\&.
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.LP
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Inclusion of the \fI<sys/wait.h>\fP header may also make visible all
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symbols from \fI<signal.h>\fP and \fI<sys/resource.h>\fP.
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.LP
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The following shall be declared as functions and may also be defined
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as macros. Function prototypes shall be provided.
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.sp
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.RS
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.nf
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\fBpid_t wait(int *);
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int waitid(idtype_t, id_t, siginfo_t *, int);
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pid_t waitpid(pid_t, int *, int);
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\fP
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.fi
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.RE
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fI<signal.h>\fP , \fI<sys/resource.h>\fP , \fI<sys/types.h>\fP ,
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the System Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIwait\fP(),
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\fIwaitid\fP()
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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