|EXIT(2)||System Calls Manual||EXIT(2)|
LIBRARY¶Standard C Library (libc, -lc)
_exit() system call terminates a process with the following consequences:
- All of the descriptors open in the calling process are closed. This may entail delays, for example, waiting for output to drain; a process in this state may not be killed, as it is already dying.
- If the parent process of the calling process has an outstanding
wait(2) call or catches the
SIGCHLDsignal, it is notified of the calling process's termination and the status is set as defined by wait(2).
- The parent process-ID of all of the calling process's existing child processes are set to the process-ID of the calling process's reaper; the reaper (normally the initialization process) inherits each of these processes (see procctl(2), init(8) and the DEFINITIONS section of intro(2)).
- If the termination of the process causes any process group to become
orphaned (usually because the parents of all members of the group have now
exited; see “orphaned process group” in
intro(2)), and if any member of the orphaned group is
SIGHUPsignal and the
SIGCONTsignal are sent to all members of the newly-orphaned process group.
- If the process is a controlling process (see intro(2)),
SIGHUPsignal is sent to the foreground process group of the controlling terminal, and all current access to the controlling terminal is revoked.
Most C programs call the library routine
exit(3), which flushes buffers, closes streams, unlinks
temporary files, etc., before calling
_exit() system call can never return.
SEE ALSO¶fork(2), sigaction(2), wait(2), exit(3), init(8)
_exit() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).
_exit() function appeared in Version 7 AT&T UNIX.
|September 8, 2016||Linux 4.19.0-6-amd64|