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30191d1a57
bugs in various places whilst doing this (places that assumed
BOOL == int). I also need to fix the Samba4 pidl generation
(next checkin).
Jeremy.
(This used to be commit f35a266b3c)
139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/*
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Unix SMB/CIFS implementation.
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/****************************************************************************
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Catch child exits and reap the child zombie status.
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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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;
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/*
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* Turns out it's *really* important not to
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* restore the signal handler here if we have real POSIX
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* signal handling. If we do, then we get the signal re-delivered
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* immediately - hey presto - instant loop ! JRA.
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*/
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#if !defined(HAVE_SIGACTION)
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CatchSignal(SIGCLD, sig_cld);
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#endif
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}
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/****************************************************************************
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catch child exits - leave status;
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****************************************************************************/
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static void sig_cld_leave_status(int signum)
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{
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/*
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* Turns out it's *really* important not to
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* restore the signal handler here if we have real POSIX
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* signal handling. If we do, then we get the signal re-delivered
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* immediately - hey presto - instant loop ! JRA.
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*/
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#if !defined(HAVE_SIGACTION)
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CatchSignal(SIGCLD, sig_cld_leave_status);
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#endif
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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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if (block) {
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sigblock(sigmask(signum));
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} else {
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sigsetmask(siggetmask() & ~sigmask(signum));
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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 )))(int)
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{
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#ifdef HAVE_SIGACTION
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struct sigaction act;
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struct sigaction oldact;
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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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/*
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* We *want* SIGALRM to interrupt a system call.
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*/
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if(signum != SIGALRM)
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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,&oldact);
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return oldact.sa_handler;
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#else /* !HAVE_SIGACTION */
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/* FIXME: need to handle sigvec and systems with broken signal() */
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return 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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/*******************************************************************
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Catch SIGCLD but leave the child around so it's status can be reaped.
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********************************************************************/
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void CatchChildLeaveStatus(void)
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{
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CatchSignal(SIGCLD, sig_cld_leave_status);
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}
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