sys_wait.h(0P) POSIX Programmer's Manual sys_wait.h(0P)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.
NAME
sys/wait.h — declarations for waiting
SYNOPSIS
#include <sys/wait.h>
DESCRIPTION
The <sys/wait.h> header shall define the following symbolic constants
for use with waitpid():
WCONTINUED Report status of continued child process.
WNOHANG Do not hang if no status is available; return immedi‐
ately.
WUNTRACED Report status of stopped child process.
The <sys/wait.h> header shall define the following macros for analysis
of process status values:
WEXITSTATUS Return exit status.
WIFCONTINUED True if child has been continued.
WIFEXITED True if child exited normally.
WIFSIGNALED True if child exited due to uncaught signal.
WIFSTOPPED True if child is currently stopped.
WSTOPSIG Return signal number that caused process to stop.
WTERMSIG Return signal number that caused process to terminate.
The <sys/wait.h> header shall define the following symbolic constants
as possible values for the options argument to waitid():
WEXITED Wait for processes that have exited.
WNOWAIT Keep the process whose status is returned in infop in a
waitable state.
WSTOPPED Status is returned for any child that has stopped upon
receipt of a signal.
The WCONTINUED and WNOHANG constants, described above for waitpid(),
can also be used with waitid().
The type idtype_t shall be defined as an enumeration type whose possi‐
ble values shall include at least the following: P_ALL P_PGID P_PID
The <sys/wait.h> header shall define the id_t and pid_t types as
described in <sys/types.h>.
The <sys/wait.h> header shall define the siginfo_t type as described in
<signal.h>.
Inclusion of the <sys/wait.h> header may also make visible all symbols
from <signal.h>.
The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.
pid_t wait(int *);
int waitid(idtype_t, id_t, siginfo_t *, int);
pid_t waitpid(pid_t, int *, int);
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<signal.h>, <sys_types.h>
The System Interfaces volume of POSIX.1‐2008, wait(), waitid()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 Electri‐
cal 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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 sys_wait.h(0P)
