/* * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> * 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 John Birrell. * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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. * */ #include <signal.h> #include <errno.h> #ifdef _THREAD_SAFE #include <pthread.h> #include "pthread_private.h" int sigaction(int sig, const struct sigaction * act, struct sigaction * oact) { int ret = 0; struct sigaction gact; /* Check if the signal number is out of range: */ if (sig < 1 || sig > NSIG) { /* Return an invalid argument: */ errno = EINVAL; ret = -1; } else { /* * Check if the existing signal action structure contents are * to be returned: */ if (oact != NULL) { /* Return the existing signal action contents: */ oact->sa_handler = _thread_sigact[sig - 1].sa_handler; oact->sa_mask = _thread_sigact[sig - 1].sa_mask; oact->sa_flags = _thread_sigact[sig - 1].sa_flags; } /* Check if a signal action was supplied: */ if (act != NULL) { /* Set the new signal handler: */ _thread_sigact[sig - 1].sa_mask = act->sa_mask; _thread_sigact[sig - 1].sa_flags = act->sa_flags; _thread_sigact[sig - 1].sa_handler = act->sa_handler; } /* * Check if the kernel needs to be advised of a change * in signal action: */ if (act != NULL && sig != SIGVTALRM && sig != SIGCHLD && sig != SIGINFO) { /* Initialise the global signal action structure: */ gact.sa_mask = act->sa_mask; gact.sa_flags = 0; /* * Check if the signal handler is being set to * the default or ignore handlers: */ if (act->sa_handler == SIG_DFL || act->sa_handler == SIG_IGN) /* Specify the built in handler: */ gact.sa_handler = act->sa_handler; else /* * Specify the thread kernel signal * handler: */ gact.sa_handler = (void (*) ()) _thread_sig_handler; /* Change the signal action in the kernel: */ if (_thread_sys_sigaction(sig,&gact,NULL) != 0) ret = -1; } } /* Return the completion status: */ return (ret); } #endif