Mercurial > dovecot > core-2.2
view src/lib/alarm-hup.c @ 903:fd8888f6f037 HEAD
Naming style changes, finally got tired of most of the typedefs. Also the
previous enum -> macro change reverted so that we don't use the highest bit
anymore, that's incompatible with old indexes so they will be rebuilt.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 05 Jan 2003 15:09:51 +0200 |
parents | aafe524f26c4 |
children | f57cc4bfa195 |
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/* alarm-hup.c - Send SIGHUP once in a while to avoid infinitely blocking calls Copyright (c) 2002 Timo Sirainen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "lib.h" #include "alarm-hup.h" #include <signal.h> #include <unistd.h> static int initialized = FALSE; static unsigned int alarm_timeout = 30; unsigned int alarm_hup_set_interval(unsigned int timeout) { unsigned int old; old = alarm_timeout; alarm_timeout = timeout; alarm(alarm_timeout); return old; } static void sig_alarm(int signo __attr_unused__) { /* we need fcntl() to stop with EINTR */ if (raise(SIGHUP) < 0) i_fatal("kill(): %m"); /* do it again */ alarm(alarm_timeout); #ifndef HAVE_SIGACTION signal(SIGALRM, sig_alarm); #endif } void alarm_hup_init(void) { #ifdef HAVE_SIGACTION struct sigaction act; #endif if (initialized) return; initialized = TRUE; #ifdef HAVE_SIGACTION if (sigemptyset(&act.sa_mask) < 0) i_fatal("sigemptyset(): %m"); act.sa_flags = 0; act.sa_handler = sig_alarm; while (sigaction(SIGALRM, &act, NULL) < 0) { if (errno != EINTR) i_fatal("sigaction(): %m"); } #else /* at least Linux blocks raise(SIGHUP) inside SIGALRM handler if it's added with signal().. sigaction() should be pretty much everywhere though, so this code is pretty useless. */ #warning timeouting may not work signal(SIGALRM, sig_alarm); #endif alarm(alarm_timeout); } void alarm_hup_deinit(void) { #ifdef HAVE_SIGACTION struct sigaction act; #endif if (!initialized) return; initialized = FALSE; alarm(0); #ifdef HAVE_SIGACTION if (sigemptyset(&act.sa_mask) < 0) i_fatal("sigemptyset(): %m"); act.sa_flags = 0; act.sa_handler = SIG_DFL; while (sigaction(SIGALRM, &act, NULL) < 0) { if (errno != EINTR) i_fatal("sigaction(): %m"); } #else signal(SIGALRM, SIG_DFL); #endif }