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Diffstat (limited to 'source4/lib/util/signal.c')
| -rw-r--r-- | source4/lib/util/signal.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/source4/lib/util/signal.c b/source4/lib/util/signal.c deleted file mode 100644 index ead947eb5e..0000000000 --- a/source4/lib/util/signal.c +++ /dev/null @@ -1,144 +0,0 @@ -/* - Unix SMB/CIFS implementation. - 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 3 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, see <http://www.gnu.org/licenses/>. -*/ - -#include "includes.h" -#include "system/wait.h" - -/** - * @file - * @brief Signal handling - */ - -/**************************************************************************** - Catch child exits and reap the child zombie status. -****************************************************************************/ - -static void sig_cld(int signum) -{ - while (waitpid((pid_t)-1,(int *)NULL, WNOHANG) > 0) - ; - - /* - * Turns out it's *really* important not to - * restore the signal handler here if we have real POSIX - * signal handling. If we do, then we get the signal re-delivered - * immediately - hey presto - instant loop ! JRA. - */ - -#if !defined(HAVE_SIGACTION) - CatchSignal(SIGCLD, sig_cld); -#endif -} - -/**************************************************************************** -catch child exits - leave status; -****************************************************************************/ - -static void sig_cld_leave_status(int signum) -{ - /* - * Turns out it's *really* important not to - * restore the signal handler here if we have real POSIX - * signal handling. If we do, then we get the signal re-delivered - * immediately - hey presto - instant loop ! JRA. - */ - -#if !defined(HAVE_SIGACTION) - CatchSignal(SIGCLD, sig_cld_leave_status); -#endif -} - -/** - 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) - if (block) { - sigblock(sigmask(signum)); - } else { - sigsetmask(siggetmask() & ~sigmask(signum)); - } -#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 )))(int) -{ -#ifdef HAVE_SIGACTION - struct sigaction act; - struct sigaction oldact; - - ZERO_STRUCT(act); - - act.sa_handler = handler; -#ifdef SA_RESTART - /* - * We *want* SIGALRM to interrupt a system call. - */ - if(signum != SIGALRM) - act.sa_flags = SA_RESTART; -#endif - sigemptyset(&act.sa_mask); - sigaddset(&act.sa_mask,signum); - sigaction(signum,&act,&oldact); - return oldact.sa_handler; -#else /* !HAVE_SIGACTION */ - /* FIXME: need to handle sigvec and systems with broken signal() */ - return signal(signum, handler); -#endif -} - -/** - Ignore SIGCLD via whatever means is necessary for this OS. -**/ - -void CatchChild(void) -{ - CatchSignal(SIGCLD, sig_cld); -} - -/** - Catch SIGCLD but leave the child around so it's status can be reaped. -**/ - -void CatchChildLeaveStatus(void) -{ - CatchSignal(SIGCLD, sig_cld_leave_status); -} |