sig_psx.c
上传用户:ycwykj01
上传日期:2007-01-04
资源大小:1819k
文件大小:2k
- /*
- * Program: POSIX Signals
- *
- * Author: Mark Crispin
- * Networks and Distributed Computing
- * Computing & Communications
- * University of Washington
- * Administration Building, AG-44
- * Seattle, WA 98195
- * Internet: MRC@CAC.Washington.EDU
- *
- * Date: 29 April 1997
- * Last Edited: 15 July 1998
- *
- * Copyright 1998 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appears in all copies and that both the
- * above copyright notice and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made available
- * "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
- * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
- #include <signal.h>
- #include <string.h>
- #ifndef SA_RESTART
- #define SA_RESTART 0
- #endif
- /* Arm a signal
- * Accepts: signal number
- * desired action
- * Returns: old action
- */
- void *arm_signal (int sig,void *action)
- {
- struct sigaction nact,oact;
- memset (&nact,0,sizeof (struct sigaction));
- sigemptyset (&nact.sa_mask); /* no signals blocked */
- nact.sa_handler = action; /* set signal handler */
- nact.sa_flags = SA_RESTART; /* needed on Linux, nice on SVR4 */
- sigaction (sig,&nact,&oact); /* do the signal action */
- return (void *) oact.sa_handler;
- }