g_unix_signal: Remove g_ prefix to not collide with glib

There is a g_unix_signal_new function in glib as well now,
but that is only allowed to be used for SIGINT, SIGHUP and SIGTERM,
so we have to stay with our own.

1 files changed, 136 insertions, 0 deletions

diff --git a/src/unix_signal.c b/src/unix_signal.c
new file mode 100644
index 0000000..7577051
--- /dev/null
+++ b/src/unix_signal.c
@@ -0,0 +1,136 @@
+#define _POSIX_SOURCE
+#include <signal.h>
+#include <glib.h>
+#include "unix_signal.h"
+
+static GPtrArray *signal_data = NULL;
+
+typedef struct _UnixSignalData {
+	guint source_id;
+	GMainContext *context;
+	gboolean triggered;
+	gint signum;
+} UnixSignalData;
+
+typedef struct _UnixSignalSource {
+	GSource source;
+	UnixSignalData *data;
+} UnixSignalSource;
+
+static inline UnixSignalData *
+unix_signal_data(guint index)
+{
+	return (UnixSignalData *) g_ptr_array_index(signal_data, index);
+}
+
+static void
+handler(gint signum)
+{
+	g_assert(signal_data != NULL);
+	for (guint i = 0; i < signal_data->len; ++i)
+		if (unix_signal_data(i)->signum == signum)
+			unix_signal_data(i)->triggered = TRUE;
+	sigaction(signum, &(struct sigaction){handler}, NULL);
+}
+
+static gboolean
+check(GSource *source)
+{
+	UnixSignalSource *signal_source = (UnixSignalSource *) source;
+
+	return signal_source->data->triggered;
+}
+
+static gboolean
+prepare(GSource *source, gint *timeout_)
+{
+	UnixSignalSource *signal_source = (UnixSignalSource*) source;
+
+	if (signal_source->data->context == NULL) {
+		g_main_context_ref(signal_source->data->context = g_source_get_context(source));
+		signal_source->data->source_id = g_source_get_id(source);
+	}
+
+	*timeout_ = -1;
+
+	return signal_source->data->triggered;
+}
+
+static gboolean
+dispatch(GSource *source, GSourceFunc callback, gpointer user_data)
+{
+	UnixSignalSource *signal_source = (UnixSignalSource *) source;
+
+	signal_source->data->triggered = FALSE;
+
+	return callback(user_data) ? TRUE : FALSE;
+}
+
+static void
+finalize(GSource *source)
+{
+	UnixSignalSource *signal_source = (UnixSignalSource*) source;
+
+	sigaction(signal_source->data->signum, &(struct sigaction){NULL}, NULL);
+	g_main_context_unref(signal_source->data->context);
+	g_ptr_array_remove_fast(signal_data, signal_source->data);
+	if (signal_data->len == 0)
+		signal_data = (GPtrArray*) g_ptr_array_free(signal_data, TRUE);
+	g_free(signal_source->data);
+
+}
+static GSourceFuncs SourceFuncs = 
+{
+	.prepare  = prepare,
+	.check    = check,
+	.dispatch = dispatch,
+	.finalize = finalize,
+	.closure_callback = NULL, .closure_marshal = NULL
+};
+
+static void
+unix_signal_source_init(GSource *source, gint signum)
+{
+	UnixSignalSource *signal_source = (UnixSignalSource *) source;
+
+	signal_source->data = g_new(UnixSignalData, 1);
+	signal_source->data->triggered = FALSE;
+	signal_source->data->signum    = signum;
+	signal_source->data->context   = NULL;
+
+	if (signal_data == NULL)
+		signal_data = g_ptr_array_new();
+	g_ptr_array_add(signal_data, signal_source->data);
+}
+
+GSource *
+unix_signal_source_new(gint signum)
+{
+	GSource *source = g_source_new(&SourceFuncs, sizeof(UnixSignalSource));
+
+	unix_signal_source_init(source, signum);
+	sigaction(signum, &(struct sigaction){handler}, NULL);
+
+	return source;
+}
+
+guint
+unix_signal_add_full(gint priority, gint signum, GSourceFunc function, gpointer data, GDestroyNotify notify)
+{
+	g_return_val_if_fail(function != NULL, 0);
+	GSource *source = unix_signal_source_new(signum);
+	guint id;
+
+	if (priority != G_PRIORITY_DEFAULT)
+		g_source_set_priority (source, priority);
+	g_source_set_callback(source, function, data, notify);
+	id = g_source_attach(source, NULL);
+	g_source_unref(source);
+
+	return id;
+}
+
+guint unix_signal_add(gint signum, GSourceFunc function, gpointer data)
+{
+	return unix_signal_add_full(G_PRIORITY_DEFAULT, signum, function, data, NULL);
+}