_EXIT(2) - man page online | system calls

Terminate the calling process.

_EXIT(2)                            Linux Programmer's Manual                            _EXIT(2)

NAME _exit, _Exit - terminate the calling process
SYNOPSIS #include <unistd.h> void _exit(int status); #include <stdlib.h> void _Exit(int status); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): _Exit(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
DESCRIPTION The function _exit() terminates the calling process "immediately". Any open file descrip‐ tors 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().
RETURN VALUE These functions do not return.
CONFORMING TO POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD. The function _Exit() was introduced by C99.
NOTES For a discussion on the effects of an exit, the transmission of exit status, zombie pro‐ cesses, signals sent, and so on, see exit(3). The function _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 _exit(), is implementation-dependent. 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.
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)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at
Linux 2015-07-23 _EXIT(2)
This manual Reference Other manuals
_exit(2) referred by allegro_message(3alleg4) | arg_printusage(3) | atexit(3) | Child::Link::Proc(3pm) | clone(2) | daemon(3) | drmaa_wait(3) | execve(2freebsd) | _exit(2freebsd) | exit(3) | exit_group(2) | expect(1) | Expect(3tcl) | explain_accept4_or_die(3) | explain_accept_or_die(3) | explain_acct_or_die(3) | explain_acl_from_text_or_die(3) | explain_acl_get_fd_or_die(3) | explain_acl_get_file_or_die(3) | explain_acl_set_fd_or_die(3)
refer to atexit(3) | execve(2) | exit(3) | exit_group(2) | feature_test_macros(7) | fork(2) | kill(2) | on_exit(3) | stdio(3) | termios(3) | wait(2) | wait4(2)