PROLOGThis 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.
NAMEsys/wait.h --- declarations for waiting
DESCRIPTIONThe <sys/wait.h> header shall define the following symbolic constants for use with waitpid():
- Report status of continued child process.
- Do not hang if no status is available; return immediately.
- Report status of stopped child process. The <sys/wait.h> header shall define the following macros for analysis of process status values:
- Return exit status.
- True if child has been continued.
- True if child exited normally.
- True if child exited due to uncaught signal.
- True if child is currently stopped.
- Return signal number that caused process to stop.
- 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():
- Wait for processes that have exited.
- Keep the process whose status is returned in infop in a waitable state.
Status is returned for any child that has stopped upon receipt of a
and WNOHANG constants, described above for
can also be used with
shall be defined as an enumeration type whose possible values shall
include at least the following:
header shall define the
types as described in
header shall define the
type as described in
Inclusion of the
header may also make visible
all symbols from
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.
SEE ALSO<signal.h>, <sys_types.h> The System Interfaces volume of POSIX.1-2008, wait(), waitid()
COPYRIGHTPortions 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 www.unix.org/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 www.kernel.org/doc/man-pages/reporting_bugs.html .