sys_wait.h(3)              POSIX Programmer's Manual             sys_wait.h(3)



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

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()

COPYRIGHT
       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 .



IEEE/The Open Group                  2017                        sys_wait.h(3)
