1 files changed, 163 insertions, 0 deletions
diff --git a/polyp/mainloop-signal.c b/polyp/mainloop-signal.c
new file mode 100644
index 00000000..642ca5e0
--- /dev/null
+++ b/polyp/mainloop-signal.c
@@ -0,0 +1,163 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio 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.
+ 
+  polypaudio 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 polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+#include <signal.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mainloop-signal.h"
+#include "util.h"
+
+struct signal_info {
+    int sig;
+    struct sigaction saved_sigaction;
+    void (*callback) (void *id, int signal, void *userdata);
+    void *userdata;
+    struct signal_info *previous, *next;
+};
+
+static struct pa_mainloop_api *api = NULL;
+static int signal_pipe[2] = { -1, -1 };
+static void* mainloop_source = NULL;
+static struct signal_info *signals = NULL;
+
+static void signal_handler(int sig) {
+    write(signal_pipe[1], &sig, sizeof(sig));
+}
+
+static void callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
+    assert(a && id && events == PA_MAINLOOP_API_IO_EVENT_INPUT && id == mainloop_source && fd == signal_pipe[0]);
+
+    for (;;) {
+        ssize_t r;
+        int sig;
+        struct signal_info*s;
+        
+        if ((r = read(signal_pipe[0], &sig, sizeof(sig))) < 0) {
+            if (errno == EAGAIN)
+                return;
+
+            fprintf(stderr, "signal.c: read(): %s\n", strerror(errno));
+            return;
+        }
+
+        if (r != sizeof(sig)) {
+            fprintf(stderr, "signal.c: short read()\n");
+            return;
+        }
+
+        for (s = signals; s; s = s->next) 
+            if (s->sig == sig) {
+                assert(s->callback);
+                s->callback(s, sig, s->userdata);
+                break;
+            }
+    }
+}
+
+int pa_signal_init(struct pa_mainloop_api *a) {
+    assert(a);
+    if (pipe(signal_pipe) < 0) {
+        fprintf(stderr, "pipe() failed: %s\n", strerror(errno));
+        return -1;
+    }
+
+    pa_make_nonblock_fd(signal_pipe[0]);
+    pa_make_nonblock_fd(signal_pipe[1]);
+
+    api = a;
+    mainloop_source = api->source_io(api, signal_pipe[0], PA_MAINLOOP_API_IO_EVENT_INPUT, callback, NULL);
+    assert(mainloop_source);
+    return 0;
+}
+
+void pa_signal_done(void) {
+    assert(api && signal_pipe[0] >= 0 && signal_pipe[1] >= 0 && mainloop_source);
+
+    api->cancel_io(api, mainloop_source);
+    mainloop_source = NULL;
+
+    close(signal_pipe[0]);
+    close(signal_pipe[1]);
+    signal_pipe[0] = signal_pipe[1] = -1;
+
+    while (signals)
+        pa_signal_unregister(signals);
+    
+    api = NULL;
+}
+
+void* pa_signal_register(int sig, void (*callback) (void *id, int signal, void *userdata), void *userdata) {
+    struct signal_info *s = NULL;
+    struct sigaction sa;
+    assert(sig > 0 && callback);
+
+    for (s = signals; s; s = s->next)
+        if (s->sig == sig)
+            goto fail;
+    
+    s = malloc(sizeof(struct signal_info));
+    assert(s);
+    s->sig = sig;
+    s->callback = callback;
+    s->userdata = userdata;
+
+    memset(&sa, 0, sizeof(sa));
+    sa.sa_handler = signal_handler;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_RESTART;
+    
+    if (sigaction(sig, &sa, &s->saved_sigaction) < 0)
+        goto fail;
+
+    s->previous = NULL;
+    s->next = signals;
+    signals = s;
+
+    return s;
+fail:
+    if (s)
+        free(s);
+    return NULL;
+}
+
+void pa_signal_unregister(void *id) {
+    struct signal_info *s = id;
+    assert(s);
+
+    if (s->next)
+        s->next->previous = s->previous;
+    if (s->previous)
+        s->previous->next = s->next;
+    else
+        signals = s->next;
+
+    sigaction(s->sig, &s->saved_sigaction, NULL);
+    free(s);
+}