EXIT(2) BSD System Calls Manual EXIT(2)
NAME
_exit -- terminate the calling process
SYNOPSIS
#include <unistd.h>
void
_exit(int status);
DESCRIPTION
The _exit() function terminates a process, with the following conse-
quences:
o All of the descriptors that were 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.
o If the parent process of the calling process has an outstanding wait
call or catches the SIGCHLD signal, it is notified of the calling
process's termination; the status is set as defined by wait(2).
o The parent process-ID of all of the calling process's existing child
processes are set to 1; the initialization process (see the DEFINI-
TIONS section of intro(2)) inherits each of these processes.
o 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 stopped, the SIGHUP signal and
the SIGCONT signal are sent to all members of the newly-orphaned
process group.
o If the process is a controlling process (see intro(2)), the SIGHUP
signal is sent to the foreground process group of the controlling
terminal. 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().
RETURN VALUE
_exit() can never return.
SEE ALSO
fork(2), sigaction(2), wait(2), exit(3)
STANDARDS
The _exit function is defined by IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
Mac OS X 10.9.1 - Generated Sun Jan 5 15:21:47 CST 2014