<sys/wait.h>(P) POSIX Programmer's Manual <sys/wait.h>(P)
sys/wait.h - declarations for waiting
The <sys/wait.h> header shall define the following symbolic constants for use with wait-
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
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 following symbolic constants shall be defined as possible values for the options argu-
ment to waitid():
Wait for processes that have exited.
Status is returned for any child that has stopped upon receipt of a signal.
Status is returned for any child that was stopped and has been continued.
Return immediately if there are no children to wait for.
Keep the process whose status is returned in infop in a waitable state.
The type idtype_t shall be defined as an enumeration type whose possible values shall
include at least the following: P_ALL P_PID P_PGID
The id_t and pid_t types shall be defined as described in <sys/types.h> .
The siginfo_t type shall be defined as described in <signal.h> .
The rusage structure shall be defined as described in <sys/resource.h> .
Inclusion of the <sys/wait.h> header may also make visible all symbols from <signal.h> and
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.
<signal.h> , <sys/resource.h> , <sys/types.h> , the System Interfaces volume of
IEEE Std 1003.1-2001, wait(), waitid()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 <sys/wait.h>(P)