trusty (7) sys_wait.h.7posix.gz

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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()


       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 .