2004-01-19 Paul Jakma <paul@dishone.st>

* sigevent.{c,h}: New files, implement event handled signals.
          see signal_init() in sigevent.h.

lib/ChangeLog

@@ -1,3 +1,8 @@
+2004-01-19 Paul Jakma <paul@dishone.st>
+
+	* sigevent.{c,h}: New files, implement event handled signals.
+	  see signal_init() in sigevent.h.
+	  
 2003-12-23  Vincent Jardin  <jardin@6wind.com>
 
 	* {command.c, memory.c, vty.c, zebra.h}: Add isisd support

lib/sigevent.c

@@ -0,0 +1,147 @@
+/* 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>
+
+struct quagga_sigevent_master_t
+{
+  struct thread_master *tm;
+  struct thread *t;
+
+  struct quagga_signal_t *signals;
+  int sigc;
+ 
+} 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++;
+    }
+} 
+
+int
+quagga_signal_timer (struct thread *t)
+{
+  sigset_t newmask, oldmask;
+  struct quagga_sigevent_master_t *sigm;
+  struct quagga_signal_t *sig;
+  int i;
+
+  sigm = THREAD_ARG (t);
+  
+  /* block all signals */
+  sigfillset (&newmask);
+  if ( (sigprocmask (SIG_BLOCK, &newmask, &oldmask)) < 0)
+    {
+      zlog_err ("quagga_signal_timer: couldnt block signals!");
+		  sigm->t = thread_add_timer (sigm->tm, quagga_signal_timer, 
+		                              &sigmaster, QUAGGA_SIGNAL_TIMER_INTERVAL);    
+      return -1;
+    }
+  
+  for (i = 0; i < sigm->sigc; i++)
+    {
+      sig = &(sigm->signals[i]);
+      if (sig->caught > 0)
+        {
+          sig->caught = 0;
+          sig->handler();
+        }
+    }
+  
+  sigm->t = thread_add_timer (sigm->tm, quagga_signal_timer, &sigmaster, 
+                                           QUAGGA_SIGNAL_TIMER_INTERVAL);
+
+  if ( sigprocmask (SIG_UNBLOCK, &oldmask, NULL) < 0 );
+    return -1;
+  
+  return 0;
+}
+
+/* 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;
+  sigmaster.tm = m;
+  
+  sigmaster.t = 
+    thread_add_timer (m, quagga_signal_timer, &sigmaster, 
+                      QUAGGA_SIGNAL_TIMER_INTERVAL);
+
+}
+

lib/sigevent.h

@@ -0,0 +1,49 @@
+/* 
+ * Quagga Signal handling header.
+ *
+ * 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.  
+ */
+
+#ifndef _QUAGGA_SIGNAL_H
+#define _QUAGGA_SIGNAL_H
+#include <thread.h>
+
+#define QUAGGA_SIGNAL_TIMER_INTERVAL 2L
+#define Q_SIGC(sig) (sizeof(sig)/sizeof(sig[0]))
+
+struct quagga_signal_t
+{
+  int signal;                     /* signal number    */
+  void (*handler) (void);         /* handler to call  */
+
+  volatile sig_atomic_t caught;   /* private member   */
+};
+
+/* initialise sigevent system
+ * takes:
+ * - pointer to valid struct thread_master
+ * - number of elements in passed in signals array
+ * - array of quagga_signal_t's describing signals to handle
+ *   and handlers to use for each signal
+ */
+void signal_init (struct thread_master *m, int sigc, 
+                         struct quagga_signal_t *signals);
+
+#endif /* _QUAGGA_SIGNAL_H */