1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* 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 "calobj.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;
CalendarAlarm *alarm;
} 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;
time_t now = time (NULL);
char c;
if (read (alarm_pipes [0], &c, 1) != 1)
return;
if (ar == NULL){
g_warning ("Empty events. This should not happen\n");
return;
}
while (head_alarm){
(*ar->fn)(ar->activation_time, ar->alarm, ar->closure);
alarms = g_list_remove (alarms, head_alarm);
/* Schedule next alarm */
if (alarms){
AlarmRecord *next;
head_alarm = alarms->data;
next = head_alarm;
if (next->activation_time > now){
struct itimerval itimer;
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = 0;
itimer.it_value.tv_sec = next->activation_time - now;
itimer.it_value.tv_usec = 0;
setitimer (ITIMER_REAL, &itimer, NULL);
break;
} else {
g_free (ar);
ar = next;
}
} else
head_alarm = NULL;
}
g_free (ar);
}
static int
alarm_compare_by_time (gconstpointer a, gconstpointer b)
{
const AlarmRecord *ara = a;
const AlarmRecord *arb = b;
time_t diff;
diff = ara->activation_time - arb->activation_time;
return (diff < 0) ? -1 : (diff > 0) ? 1 : 0;
}
/**
* alarm_add:
*
* Tries to schedule @alarm.
*
* Returns TRUE if the alarm was scheduled.
*/
gboolean
alarm_add (CalendarAlarm *alarm, AlarmFunction fn, void *closure)
{
time_t now = time (NULL);
AlarmRecord *ar;
time_t alarm_time = alarm->trigger;
/* If it already expired, do not add it */
if (alarm_time < now)
return FALSE;
ar = g_new0 (AlarmRecord, 1);
ar->activation_time = alarm_time;
ar->fn = fn;
ar->closure = closure;
ar->alarm = alarm;
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;
}
return TRUE;
}
int
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 1;
}
}
return 0;
}
void
alarm_init (void)
{
struct sigaction sa;
int flags = 0;
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);
}
|
