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103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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signal handling functions
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/****************************************************************************
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catch child exits
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****************************************************************************/
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static void sig_cld(int signum)
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{
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while (sys_waitpid((pid_t)-1,(int *)NULL, WNOHANG) > 0) ;
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CatchSignal(SIGCLD, sig_cld);
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}
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/*******************************************************************
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block sigs
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********************************************************************/
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void BlockSignals(BOOL block,int signum)
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{
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#ifdef HAVE_SIGPROCMASK
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sigset_t set;
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sigemptyset(&set);
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sigaddset(&set,signum);
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sigprocmask(block?SIG_BLOCK:SIG_UNBLOCK,&set,NULL);
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#elif defined(HAVE_SIGBLOCK)
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int block_mask = sigmask(signum);
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static int oldmask = 0;
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if (block) {
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oldmask = sigblock(block_mask);
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} else {
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sigsetmask(oldmask);
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}
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#else
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/* yikes! This platform can't block signals? */
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static int done;
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if (!done) {
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DEBUG(0,("WARNING: No signal blocking available\n"));
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done=1;
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}
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#endif
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}
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/*******************************************************************
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catch a signal. This should implement the following semantics:
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1) the handler remains installed after being called
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2) the signal should be blocked during handler execution
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********************************************************************/
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void CatchSignal(int signum,void (*handler)(int ))
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{
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#ifdef HAVE_SIGACTION
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struct sigaction act;
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ZERO_STRUCT(act);
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act.sa_handler = handler;
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#ifdef SA_RESTART
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act.sa_flags = SA_RESTART;
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#endif
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask,signum);
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sigaction(signum,&act,NULL);
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#else
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/* FIXME: need to handle sigvec and systems with broken signal() */
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signal(signum, handler);
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#endif
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}
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/*******************************************************************
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ignore SIGCLD via whatever means is necessary for this OS
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********************************************************************/
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void CatchChild(void)
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{
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CatchSignal(SIGCLD, sig_cld);
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}
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