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
		     immediately.

       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
       possible 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 and the sigval
       union 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_resource.h>, <sys_types.h>

       The System Interfaces volume of POSIX.1‐2017, wait(), waitid()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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 .

IEEE/The Open Group		     2017			sys_wait.h(0P)