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-rw-r--r--src/libmowgli/base/mowgli_signal.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/src/libmowgli/base/mowgli_signal.c b/src/libmowgli/base/mowgli_signal.c
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+++ b/src/libmowgli/base/mowgli_signal.c
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+/*
+ * libmowgli: A collection of useful routines for programming.
+ * mowgli_signal.c: Safe signal handling.
+ *
+ * Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ */
+
+#ifndef _WIN32
+
+#include <signal.h>
+#include "mowgli.h"
+
+static mowgli_signal_handler_t
+mowgli_signal_install_handler_full(int signum, mowgli_signal_handler_t handler,
+ int *sigtoblock, size_t sigtoblocksize)
+{
+ struct sigaction action, old_action;
+ size_t i;
+
+ action.sa_handler = handler;
+ action.sa_flags = SA_RESTART;
+
+ sigemptyset(&action.sa_mask);
+
+ for (i = 0; i < sigtoblocksize; i++)
+ sigaddset(&action.sa_mask, sigtoblock[i]);
+
+ if (sigaction(signum, &action, &old_action) == -1)
+ {
+ mowgli_log("Failed to install signal handler for signal %d", signum);
+ return NULL;
+ }
+
+ return old_action.sa_handler;
+}
+
+/*
+ * A version of signal(2) that works more reliably across different
+ * platforms.
+ *
+ * It restarts interrupted system calls, does not reset the handler,
+ * and blocks the same signal from within the handler.
+ */
+mowgli_signal_handler_t
+mowgli_signal_install_handler(int signum, mowgli_signal_handler_t handler)
+{
+ return mowgli_signal_install_handler_full(signum, handler, NULL, 0);
+}
+
+#endif