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#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);
}
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