<sys/wait.h>(0P)                                    POSIX Programmer's Manual                                   <sys/wait.h>(0P)



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 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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                              <sys/wait.h>(0P)