sys_wait.h(0P)            POSIX Programmer's Manual           sys_wait.h(0P)

PROLOG         top

       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         top

       sys/wait.h — declarations for waiting

SYNOPSIS         top

       #include <sys/wait.h>

DESCRIPTION         top

       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

       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

       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 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.



RATIONALE         top




SEE ALSO         top

       signal.h(0p), sys_types.h(0p)

       The System Interfaces volume of POSIX.1‐2008, wait(3p), waitid(3p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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 .

       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 .

IEEE/The Open Group                 2013                      sys_wait.h(0P)