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sys/wait.h - declarations for waiting
The <sys/wait.h> header shall define the following symbolic constants for use with waitpid():
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
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 following symbolic constants shall be defined as possible values for the options argument to waitid(): WEXITED Wait for processes that have exited. WSTOPPED Status is returned for any child that has stopped upon receipt of a signal. WCONTINUED Status is returned for any child that was stopped and has been continued. WNOHANG Return immediately if there are no children to wait for. WNOWAIT Keep the process whose status is returned in infop in a waitable state.
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 <sys/resource.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.
<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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
|IEEE/The Open Group||<sys/wait.h> (P)||2003|