wait.h

<sys/wait.h>(P)						      <sys/wait.h>(P)



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():

       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  following  symbolic constants shall be defined as possible values
       for the options argument to waitid():

       WEXITED
	      Wait for processes that have exited.

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

       WCONTINUED
	      Status  is returned for any child that was stopped and has been
	      continued.

       WNOHANG
	      Return immediately if there are no children to wait for.

       WNOWAIT
	      Keep the process whose status is returned in infop in  a	wait-
	      able state.


       The type idtype_t shall be defined as an enumeration type whose possi-
       ble values shall include at least the following: P_ALL P_PID P_PGID

       The  id_t  and  pid_t  types  shall  be	defined	  as   described   in
       <sys/types.h> .

       The siginfo_t type shall be defined as described in <signal.h> .

       The rusage structure shall be defined as described in <sys/resource.h>
       .

       Inclusion of the <sys/wait.h> header may also make visible all symbols
       from <signal.h> and <sys/resource.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 IEEE Std 1003.1-2001, wait(), waitid()

COPYRIGHT
       Portions	 of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information  Technol-
       ogy  --	Portable  Operating  System Interface (POSIX), The Open Group
       Base Specifications Issue 6, Copyright (C) 2001-2003 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 .



POSIX				     2003		      <sys/wait.h>(P)