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<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 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 vol-
       ume 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 original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

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