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exit(3) [freebsd man page]

EXIT(3) 						   BSD Library Functions Manual 						   EXIT(3)

NAME
exit, _Exit -- perform normal program termination LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> void exit(int status); void _Exit(int status); DESCRIPTION
The exit() and _Exit() functions terminate a process. Before termination, exit() performs the following functions in the order listed: 1. Call the functions registered with the atexit(3) function, in the reverse order of their registration. 2. Flush all open output streams. 3. Close all open streams. 4. Unlink all files created with the tmpfile(3) function. The _Exit() function terminates without calling the functions registered with the atexit(3) function, and may or may not perform the other actions listed. Both functions make the low-order eight bits of the status argument available to a parent process which has called a wait(2)-family function. The C Standard (ISO/IEC 9899:1999 (``ISO C99'')) defines the values 0, EXIT_SUCCESS, and EXIT_FAILURE as possible values of status. Cooper- ating processes may use other values; in a program which might be called by a mail transfer agent, the values described in sysexits(3) may be used to provide more information to the parent process. Note that exit() does nothing to prevent bottomless recursion should a function registered using atexit(3) itself call exit(). Such func- tions must call _Exit() instead (although this has other effects as well which may not be desired). RETURN VALUES
The exit() and _Exit() functions never return. SEE ALSO
_exit(2), wait(2), at_quick_exit(3), atexit(3), intro(3), quick_exit(3), sysexits(3), tmpfile(3) STANDARDS
The exit() and _Exit() functions conform to ISO/IEC 9899:1999 (``ISO C99''). BSD
September 9, 2002 BSD

Check Out this Related Man Page

EXIT(2) 						      BSD System Calls Manual							   EXIT(2)

NAME
_Exit, _exit -- terminate the calling process LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> void _Exit(int status); #include <unistd.h> void _exit(int status); DESCRIPTION
The _Exit() and _exit() functions are equivalent. They each terminate a process with the following consequences: 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 DEFINI- TIONS 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 group. o If the process is a controlling process (see intro(2)), the SIGHUP signal is sent to the foreground process group of the controlling ter- minal, 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, etc., before calling _exit(). RETURN VALUES
_Exit() and _exit() can never return. SEE ALSO
fork(2), sigaction(2), wait(2), exit(3) STANDARDS
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

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