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/*
* Alarm handling for the GNOME Calendar.
*
* (C) 1998 the Free Software Foundation
*
* Author: Miguel de Icaza (miguel@kernel.org)
*/
#include <config.h>
#include <time.h>
#include <gnome.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/time.h>
#include "alarm.h"
/* The pipes used to notify about an alarm */
int alarm_pipes [2];
/* The list of pending alarms */
static GList *alarms;
static void *head_alarm;
typedef struct {
time_t activation_time;
AlarmFunction fn;
void *closure;
} AlarmRecord;
/*
* SIGALRM handler. Notifies the callback about the alarm
*/
static void
alarm_activate ()
{
char c = 0;
write (alarm_pipes [1], &c, 1);
}
static void
alarm_ready (void *closure, int fd, GdkInputCondition cond)
{
AlarmRecord *ar = head_alarm;
char c;
if (read (alarm_pipes [0], &c, 1) != 1)
return;
if (ar == NULL){
g_warning ("Empty events. This should not happen\n");
return;
}
(*ar->fn)(ar->activation_time, ar->closure);
alarms = g_list_remove (alarms, head_alarm);
if (alarms)
head_alarm = alarms->data;
else
head_alarm = NULL;
g_free (ar);
}
static int
alarm_compare_by_time (gpointer a, gpointer b)
{
AlarmRecord *ara = a;
AlarmRecord *arb = b;
time_t diff;
diff = ara->activation_time - arb->activation_time;
return (diff < 0) ? -1 : (diff > 0) ? 1 : 0;
}
void
alarm_add (time_t alarm_time, AlarmFunction fn, void *closure)
{
time_t now = time (NULL);
AlarmRecord *ar;
/* If it already expired, do not add it */
if (alarm_time < now)
return;
ar = g_new0 (AlarmRecord, 1);
ar->activation_time = alarm_time;
ar->fn = fn;
ar->closure = closure;
alarms = g_list_insert_sorted (alarms, ar, alarm_compare_by_time);
/* If first alarm is not the previous first alarm, reschedule SIGALRM */
if (head_alarm != alarms->data){
struct itimerval itimer;
int v;
/* Set the timer to disable upon activation */
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = 0;
itimer.it_value.tv_sec = alarm_time - now;
itimer.it_value.tv_usec = 0;
v = setitimer (ITIMER_REAL, &itimer, NULL);
head_alarm = alarms->data;
}
}
void
alarm_kill (void *closure_key)
{
GList *p;
for (p = alarms; p; p = p->next){
AlarmRecord *ar = p->data;
if (ar->closure == closure_key){
alarms = g_list_remove (alarms, p->data);
if (alarms)
head_alarm = alarms->data;
else
head_alarm = NULL;
return;
}
}
}
void
alarm_init (void)
{
struct sigaction sa;
int flags;
pipe (alarm_pipes);
/* set non blocking mode */
fcntl (alarm_pipes [0], F_GETFL, &flags);
fcntl (alarm_pipes [0], F_SETFL, flags | O_NONBLOCK);
gdk_input_add (alarm_pipes [0], GDK_INPUT_READ, alarm_ready, 0);
/* Setup the signal handler */
sa.sa_handler = alarm_activate;
sigemptyset (&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction (SIGALRM, &sa, NULL);
}
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