1 files changed, 119 insertions, 0 deletions
diff --git a/src/sig.c b/src/sig.c
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+++ b/src/sig.c
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+/*-
+ * Copyright (c) 1997 - 1999, 2001 Brian Somers <brian@Awfulhak.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/sig.c,v 1.18.40.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#include <sys/types.h>
+
+#include <signal.h>
+
+#include "log.h"
+#include "sig.h"
+
+static int caused[NSIG];	/* An array of pending signals */
+static int necessary;		/* Anything set ? */
+static sig_type handler[NSIG];	/* all start at SIG_DFL */
+
+
+/*
+ * Record a signal in the "caused" array
+ *
+ * This function is the only thing actually called in signal context.  It
+ * records that a signal has been caused and that sig_Handle() should be
+ * called (in non-signal context) as soon as possible to process that
+ * signal.
+ */
+static void
+signal_recorder(int sig)
+{
+  caused[sig - 1]++;
+  necessary = 1;
+}
+
+
+/*
+ * Set up signal_recorder to handle the given sig and record ``fn'' as
+ * the function to ultimately call in sig_Handle().  ``fn'' will not be
+ * called in signal context (as sig_Handle() is not called in signal
+ * context).
+ */
+sig_type
+sig_signal(int sig, sig_type fn)
+{
+  sig_type Result;
+
+  if (sig <= 0 || sig > NSIG) {
+    /* Oops - we must be a bit out of date (too many sigs ?) */
+    log_Printf(LogALERT, "Eeek! %s:%d: I must be out of date!\n",
+	      __FILE__, __LINE__);
+    return signal(sig, fn);
+  }
+  Result = handler[sig - 1];
+  if (fn == SIG_DFL || fn == SIG_IGN) {
+    signal(sig, fn);
+    handler[sig - 1] = (sig_type) 0;
+  } else {
+    handler[sig - 1] = fn;
+    signal(sig, signal_recorder);
+  }
+  caused[sig - 1] = 0;
+  return Result;
+}
+
+
+/*
+ * Call the handlers for any pending signals
+ *
+ * This function is called from a non-signal context - in fact, it's
+ * called every time select() in DoLoop() returns - just in case
+ * select() returned due to a signal being recorded by signal_recorder().
+ */
+int
+sig_Handle()
+{
+  int sig;
+  int got;
+  int result;
+
+  result = 0;
+  if (necessary) {
+    /* We've *probably* got something in `caused' set */
+    necessary = 0;
+    /* `necessary' might go back to 1 while we're in here.... */
+    do {
+      got = 0;
+      for (sig = 0; sig < NSIG; sig++)
+        if (caused[sig]) {
+	  caused[sig]--;
+	  got++;
+	  result++;
+	  (*handler[sig])(sig + 1);
+        }
+    } while (got);
+  }
+
+  return result;
+}