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/* Quagga signal handling functions.
* Copyright (C) 2004 Paul Jakma,
*
* This file is part of Quagga.
*
* Quagga 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, or (at your option) any
* later version.
*
* Quagga 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 Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include <sigevent.h>
#include <log.h>
/* master signals descriptor struct */
struct quagga_sigevent_master_t
{
struct thread *t;
struct quagga_signal_t *signals;
int sigc;
volatile sig_atomic_t caught;
} sigmaster;
/* Generic signal handler
* Schedules signal event thread
*/
void
quagga_signal_handler (int signo)
{
int i;
struct quagga_signal_t *sig;
for (i = 0; i < sigmaster.sigc; i++)
{
sig = &(sigmaster.signals[i]);
if (sig->signal == signo)
sig->caught = 1;
}
sigmaster.caught = 1;
}
/* check if signals have been caught and run appropriate handlers */
int
quagga_sigevent_process (void)
{
struct quagga_signal_t *sig;
int i;
#ifdef SIGEVENT_BLOCK_SIGNALS
/* shouldnt need to block signals, but potentially may be needed */
sigset_t newmask, oldmask;
/*
* Block most signals, but be careful not to defer SIGTRAP because
* doing so breaks gdb, at least on NetBSD 2.0. Avoid asking to
* block SIGKILL, just because we shouldn't be able to do so.
*/
sigfillset (&newmask);
sigdelset (&newmask, SIGTRAP);
sigdelset (&newmask, SIGKILL);
if ( (sigprocmask (SIG_BLOCK, &newmask, &oldmask)) < 0)
{
zlog_err ("quagga_signal_timer: couldnt block signals!");
return -1;
}
#endif /* SIGEVENT_BLOCK_SIGNALS */
if (sigmaster.caught > 0)
{
sigmaster.caught = 0;
/* must not read or set sigmaster.caught after here,
* race condition with per-sig caught flags if one does
*/
for (i = 0; i < sigmaster.sigc; i++)
{
sig = &(sigmaster.signals[i]);
if (sig->caught > 0)
{
sig->caught = 0;
sig->handler ();
}
}
}
#ifdef SIGEVENT_BLOCK_SIGNALS
if ( sigprocmask (SIG_UNBLOCK, &oldmask, NULL) < 0 );
return -1;
#endif /* SIGEVENT_BLOCK_SIGNALS */
return 0;
}
#ifdef SIGEVENT_SCHEDULE_THREAD
/* timer thread to check signals. Shouldnt be needed */
int
quagga_signal_timer (struct thread *t)
{
struct quagga_sigevent_master_t *sigm;
struct quagga_signal_t *sig;
int i;
sigm = THREAD_ARG (t);
sigm->t = thread_add_timer (sigm->t->master, quagga_signal_timer, &sigmaster,
QUAGGA_SIGNAL_TIMER_INTERVAL);
return quagga_sigevent_process ();
}
#endif /* SIGEVENT_SCHEDULE_THREAD */
/* Initialization of signal handles. */
/* Signale wrapper. */
int
signal_set (int signo)
{
int ret;
struct sigaction sig;
struct sigaction osig;
sig.sa_handler = &quagga_signal_handler;
sigfillset (&sig.sa_mask);
sig.sa_flags = 0;
if (signo == SIGALRM) {
#ifdef SA_INTERRUPT
sig.sa_flags |= SA_INTERRUPT; /* SunOS */
#endif
} else {
#ifdef SA_RESTART
sig.sa_flags |= SA_RESTART;
#endif /* SA_RESTART */
}
ret = sigaction (signo, &sig, &osig);
if (ret < 0)
return ret;
else
return 0;
}
void
signal_init (struct thread_master *m, int sigc,
struct quagga_signal_t signals[])
{
int i = 0;
struct quagga_signal_t *sig;
while (i < sigc)
{
sig = &signals[i];
if ( signal_set (sig->signal) < 0 )
exit (-1);
i++;
}
sigmaster.sigc = sigc;
sigmaster.signals = signals;
#ifdef SIGEVENT_SCHEDULE_THREAD
sigmaster.t =
thread_add_timer (m, quagga_signal_timer, &sigmaster,
QUAGGA_SIGNAL_TIMER_INTERVAL);
#endif /* SIGEVENT_SCHEDULE_THREAD */
}
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