1 files changed, 132 insertions, 0 deletions
diff --git a/src/dsignal.c b/src/dsignal.c
new file mode 100644
index 0000000..c41aa9d
--- /dev/null
+++ b/src/dsignal.c
@@ -0,0 +1,132 @@
+/*
+ * This file is part of libdaemon.
+ *
+ * libdaemon 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 of the License, or
+ * (at your option) any later version.
+ *
+ * libdaemon 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 libdaemon; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#define _GNU_SOURCE
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdarg.h>
+#include <signal.h>
+
+#include "dsignal.h"
+#include "dlog.h"
+#include "dnonblock.h"
+
+static int _signal_pipe[2] = { -1, -1 };
+
+static void _sigfunc(int s) {
+    write(_signal_pipe[1], &s, sizeof(s));
+}
+
+static int _init(void) {
+
+    if (_signal_pipe[0] < 0 || _signal_pipe[1] < 0) {
+        if (pipe(_signal_pipe) < 0) {
+            daemon_log(LOG_ERR, "pipe(): %s", strerror(errno));
+            return -1;
+        }
+
+        if (daemon_nonblock(_signal_pipe[0], 1) < 0 || daemon_nonblock(_signal_pipe[1], 1) < 0)
+            return -1;
+
+    }
+
+    return 0;
+}
+
+int daemon_signal_install(int s){
+    struct sigaction sa;
+
+    if (_init() < 0)
+        return -1;
+    
+    memset(&sa, 0, sizeof(sa));
+    sa.sa_handler = _sigfunc;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_RESTART;
+        
+    if (sigaction(s, &sa, NULL) < 0) {
+        daemon_log(LOG_ERR, "sigaction(%s, ...) failed.", strsignal(s));
+        return -1;
+    }
+
+    return 0;
+}
+
+int daemon_signal_init(int s, ...) {
+    int sig, r = 0;
+    
+    va_list ap;
+    va_start(ap, s);
+
+    if (_init() < 0)
+        return -1;
+
+    sig = s;
+    while (sig > 0) {
+        if (daemon_signal_install(sig) < 0) {
+            r = -1;
+            break;
+        }
+        
+        sig = va_arg(ap, int);
+    }
+            
+    va_end(ap);
+
+
+    return r;
+}
+
+void daemon_signal_done(void) {
+    if (_signal_pipe[0] != -1)
+        close(_signal_pipe[0]);
+    
+    if (_signal_pipe[1] != -1)
+        close(_signal_pipe[1]);
+
+    _signal_pipe[0] = _signal_pipe[1] = -1;
+}
+
+int daemon_signal_next(void) {
+    int s;
+    ssize_t r;
+
+    if ((r = read(_signal_pipe[0], &s, sizeof(s))) == sizeof(s))
+        return s;
+
+
+    if (r < 0) {
+
+        if (errno == EAGAIN)
+            return 0;
+        else {
+            daemon_log(LOG_ERR, "read(signal_pipe[0], ...): %s", strerror(errno));
+            return -1;
+        }
+    }
+    
+    daemon_log(LOG_ERR, "Short read() on signal pipe.");
+    return -1;
+}
+
+int daemon_signal_fd(void) {
+    return _signal_pipe[0];
+}