EXIT(2) BSD System Calls Manual EXIT(2)
_Exit, _exit -- terminate the calling process
Standard C Library (libc, -lc)
The _Exit() and _exit() functions are equivalent. They each terminate a process with the
o 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.
o If the parent process of the calling process has an outstanding wait(2) call or catches
the SIGCHLD signal, it is notified of the calling process's termination and 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 DEFINITIONS 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
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, and all current access to the con-
trolling terminal is revoked.
Most C programs call the library routine exit(3), which flushes buffers, closes streams,
unlinks temporary files, etc., before calling _exit().
_Exit() and _exit() can never return.
fork(2), sigaction(2), wait(2), exit(3)
The _exit() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''). The _Exit() function
conforms to ISO/IEC 9899:1999 (``ISO C99'').
BSD April 23, 2002 BSD