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Linux 2.6 - man page for wait.h (linux section 7posix)

<sys/wait.h>(P) 		    POSIX Programmer's Manual			  <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 wait-
       pid():

       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 argu-
       ment 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 waitable state.

       The type idtype_t shall be defined as an enumeration  type  whose  possible  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 Technology -- 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				  <sys/wait.h>(P)


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