Section (2) _exit
_exit, _Exit — terminate the calling process
terminates the calling process immediately. Any open file
descriptors belonging to the process are closed. Any children
of the process are inherited by init(1) (or by the nearest
subreaper process as defined through the use of the
PR_SET_CHILD_SUBREAPER operation). The
process_zsingle_quotesz_s parent is sent a
The value status & 0377 is returned to the parent process as the process_zsingle_quotesz_s exit status, and can be collected using one of the wait(2) family of calls.
For a discussion on the effects of an exit, the transmission of exit status, zombie processes, signals sent, and so on, see exit(3).
_exit() is like
exit(3), but does not call
any functions registered with atexit(3) or on_exit(3). Open stdio(3) streams are not
flushed. On the other hand,
_exit() does close open file descriptors,
and this may cause an unknown delay, waiting for pending
output to finish. If the delay is undesired, it may be useful
to call functions like tcflush(3) before calling
_exit(). Whether any pending
I/O is canceled, and which pending I/O may be canceled upon
C library/kernel differences
In glibc up to version 2.3, the
_exit() wrapper function invoked the
kernel system call of the same name. Since glibc 2.3, the
wrapper function invokes exit_group(2), in order
to terminate all of the threads in a process.
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This manpage is Copyright (C) 1992 Drew Eckhardt;
and Copyright (C) 1993 Michael Haardt, Ian Jackson.
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Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faithcs.unc.edu>
Modified 2001-11-17, aeb