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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,  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 .