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EXIT(2) System Calls Manual EXIT(2) NAME _exit -- terminate the calling process LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> void _exit(int status); DESCRIPTION The _exit() system call terminates a process with the following conse- quences: * 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. * 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). * The parent process-ID of all of the calling process's existing child processes are set to the process-ID of the calling process's reaper; the reaper (normally the initialization process) inherits each of these processes (see procctl(2), init(8) and the "DEFINITIONS" section of in- tro(2)). * 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 mem- ber of the orphaned group is stopped, the SIGHUP signal and the SIGCONT signal are sent to all members of the newly-orphaned process group. * If the process is a controlling process (see intro(2)), the SIGHUP sig- nal is sent to the foreground process group of the controlling termi- nal, and 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, invokes atexit(3) handlers, etc., before calling _exit(). RETURN VALUES The _exit() system call can never return. SEE ALSO fork(2), sigaction(2), wait(2), atexit(3), exit(3), init(8) STANDARDS The _exit() system call is expected to conform to ISO/IEC 9945-1:1990 ("POSIX.1"). HISTORY The _exit() function appeared in Version 7 AT&T UNIX. FreeBSD ports 15.quarterly March 31, 2026 EXIT(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | HISTORY
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