at_quick_exit(3) [freebsd man page]

AT_QUICK_EXIT(3)					   BSD Library Functions Manual 					  AT_QUICK_EXIT(3)

NAME

     at_quick_exit -- registers a cleanup function to run on quick exit

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     int
     at_quick_exit(void (*func)(void));

DESCRIPTION

     The at_quick_exit() function registers a cleanup function to be called when the program exits as a result of calling quick_exit(3).  The
     cleanup functions are called in the reverse order and will not be called if the program exits by calling exit(3), _Exit(3), or abort(3).

RETURN VALUES

     The at_quick_exit() function returns the value 0 if successful and a non-zero value on failure.

SEE ALSO

     exit(3), quick_exit(3)

STANDARDS

     The at_quick_exit() function conforms to ISO/IEC 9899:2011 (``ISO C11'').

BSD
								 December 7, 2011							       BSD

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