sys_wait.h(0p) — Linux manual page


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

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

       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.



RATIONALE         top




SEE ALSO         top

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

       The System Interfaces volume of POSIX.1‐2017, wait(3p),

COPYRIGHT         top

       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 .

       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               2017                    sys_wait.h(0P)

Pages that refer to this page: stdlib.h(0p)system(3p)wait(3p)waitid(3p)