Name
_exit, _Exit — terminate the calling process
Synopsis
#include <unistd.h>
void
_exit( |
int | status); |
#include <stdlib.h>
void
_Exit( |
int | status); |
![[Note]](../stylesheet/note.png) |
Note | |||
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DESCRIPTION
The function _exit()
terminates the calling process "immediately". Any open file
descriptors belonging to the process are closed; any children
of the process are inherited by process 1, init, and the process's
parent is sent a SIGCHLD
signal.
The value status
is returned to the parent process as the process's exit
status, and can be collected using one of the wait(2) family of
calls.
The function _Exit() is
equivalent to _exit().
NOTES
For a discussion on the effects of an exit, the transmission of exit status, zombie processes, signals sent, etc., see exit(3).
The function _exit() is like
exit(3), but does not call
any functions registered with atexit(3) or on_exit(3). Whether it
flushes standard I/O buffers and removes temporary files
created with tmpfile(3) is
implementation-dependent. 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
_exit(), is
implementation-dependent.
SEE ALSO
execve(2), exit_group(2), fork(2), kill(2), wait(2), wait4(2), waitpid(2), atexit(3), exit(3), on_exit(3), termios(3)