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.TH sys_wait.h "0P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH PROLOG

This manual page is part of the POSIX Programmer's Manual.

The Linux implementation of this interface may differ (consult

the corresponding Linux manual page for details of Linux behavior),

or the interface may not be implemented on Linux.

.SH NAME

sys/wait.h

\(em declarations for waiting

.SH SYNOPSIS

.LP

.nf

#include <sys/wait.h>

.fi

.SH DESCRIPTION

The

.IR <sys/wait.h> 

header shall define the following symbolic constants for use with

\fIwaitpid\fR():

.IP WCONTINUED 14

Report status of continued child process.

.IP WNOHANG 14

Do not hang if no status is available; return immediately.

.IP WUNTRACED 14

Report status of stopped child process.

.P

The

.IR <sys/wait.h> 

header shall define the following macros for analysis of process status

values:

.IP WEXITSTATUS 14

Return exit status.

.IP WIFCONTINUED 14

True if child has been continued.

.IP WIFEXITED 14

True if child exited normally.

.IP WIFSIGNALED 14

True if child exited due to uncaught signal.

.IP WIFSTOPPED 14

True if child is currently stopped.

.IP WSTOPSIG 14

Return signal number that caused process to stop.

.IP WTERMSIG 14

Return signal number that caused process to terminate.

.P

The

.IR <sys/wait.h> 

header shall define the following symbolic constants as possible values

for the

.IR options

argument to

\fIwaitid\fR():

.IP WEXITED 14

Wait for processes that have exited.

.IP WNOWAIT 14

Keep the process whose status is returned in

.IR infop

in a waitable state.

.IP WSTOPPED 14

Status is returned for any child that has stopped upon receipt of a

signal.

.P

The

WCONTINUED

and WNOHANG constants, described above for

\fIwaitpid\fR(),

can also be used with

\fIwaitid\fR().

.P

The type

.BR idtype_t

shall be defined as an enumeration type whose possible values shall

include at least the following:

P_ALL

P_PGID

P_PID

.P

The

.IR <sys/wait.h> 

header shall define the

.BR id_t

and

.BR pid_t

types as described in

.IR <sys/types.h> .

.P

The

.IR <sys/wait.h> 

header shall define the

.BR siginfo_t

type as described in

.IR <signal.h> .

.P

Inclusion of the

.IR <sys/wait.h> 

header may also make visible

all symbols from

.IR <signal.h> .

.P

The following shall be declared as functions and may also be defined

as macros. Function prototypes shall be provided.

.sp

.RS 4

.nf

\fB

pid_t  wait(int *);

int    waitid(idtype_t, id_t, siginfo_t *, int);

pid_t  waitpid(pid_t, int *, int);

.fi \fR

.P

.RE

.LP

.IR "The following sections are informative."

.SH "APPLICATION USAGE"

None.

.SH RATIONALE

None.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "\fB<signal.h>\fP",

.IR "\fB<sys_types.h>\fP"

.P

The System Interfaces volume of POSIX.1\(hy2008,

.IR "\fIwait\fR\^(\|)",

.IR "\fIwaitid\fR\^(\|)"

.SH COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form

from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology

-- Portable Operating System Interface (POSIX), The Open Group Base

Specifications Issue 7, Copyright (C) 2013 by the Institute of

Electrical and Electronics Engineers, Inc and The Open Group.

(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the

event of any discrepancy between this version and the original IEEE and

The Open Group Standard, the original IEEE and The Open Group Standard

is the referee document. The original Standard can be obtained online at

http://www.unix.org/online.html .

Any typographical or formatting errors that appear

in this page are most likely

to have been introduced during the conversion of the source files to

man page format. To report such errors, see

https://www.kernel.org/doc/man-pages/reporting_bugs.html .