exit.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:3k
- /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- /*static char *sccsid = "from: @(#)exit.c 5.4 (Berkeley) 2/23/91";*/
- static char *rcsid = "$Id$";
- #endif /* LIBC_SCCS and not lint */
- #include <pthread.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <sys/cdefs.h>
- #include <pthread/posix.h>
- #include "atexit.h"
- void (*__cleanup)();
- /*
- * Exit, flushing stdio buffers if necessary.
- */
- void __NORETURN exit(int status)
- {
- register struct atexit *p;
- register int n;
- for (p = __atexit; p; p = p->next)
- for (n = p->ind; --n >= 0;)
- (*p->fns[n])();
- if (__cleanup)
- (*__cleanup)();
- _exit(status);
- /* This is to shut up gcc, which complains about this function
- * returning even if _exit() is declared noreturn. */
- while (1);
- }
- /*
- * Register a function to be performed at exit.
- */
- int atexit(void (*fn)())
- {
- static struct atexit __atexit0; /* one guaranteed table */
- register struct atexit *p;
- if ((p = __atexit) == NULL)
- __atexit = p = &__atexit0;
- else if (p->ind >= ATEXIT_SIZE) {
- if ((p = malloc(sizeof(*p))) == NULL)
- return (-1);
- p->ind = 0;
- p->next = __atexit;
- __atexit = p;
- }
- p->fns[p->ind++] = fn;
- return (0);
- }