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