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

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PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.


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():

       WCONTINUED    Report status of continued child process.

       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  <sys/wait.h> header shall define the following symbolic constants as possible values for the options
       argument to waitid():

       WEXITED       Wait for processes that have exited.

       WNOWAIT       Keep the process whose status is returned in infop in a waitable state.

       WSTOPPED      Status is returned for any child that has stopped upon receipt of a signal.

       The WCONTINUED and WNOHANG constants, described above for waitpid(), can also be used with waitid().

       The type idtype_t shall be defined as an enumeration type whose possible values shall  include  at  least
       the following: P_ALL P_PGID P_PID

       The <sys/wait.h> header shall define the id_t and pid_t types as described in <sys/types.h>.

       The <sys/wait.h> header shall define the siginfo_t type and the sigval union as described in <signal.h>.

       Inclusion of the <sys/wait.h> header may also make visible all symbols from <signal.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 POSIX.1‐2017, wait(), waitid()


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .