sys/wait.h - declarations for waiting
The <sys/wait.h> header shall define the following symbolic constants for use with waitpid():
- [XSI] 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.
- [XSI] 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 signal.
The [XSI] 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 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);
XSH wait, waitid
First released in Issue 3.
Included for alignment with the POSIX.1-1988 standard.
The wait3() function is removed.
The waitid() function and symbolic constants for its options argument are moved to the Base.
The description of the WNOHANG constant is clarified.
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