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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* SPDX-License-Identifier: ISC */
#include "init.h"
/* service configurations */
static service_list_t cfg;
/* service run time data, sorted by target and topological order */
static svc_run_data_t *rt_data = NULL;
static size_t rt_count = 0;
/* maps a target to range in rt_data */
static size_t queue_start[TGT_MAX];
static size_t queue_count[TGT_MAX];
/* current state */
static size_t queue_idx;
static int target = -1;
static size_t singleshot = 0;
static bool waiting = false;
/*****************************************************************************/
enum {
STATUS_OK = 0,
STATUS_FAIL,
STATUS_WAIT,
STATUS_STARTED,
};
static const char *status_str[] = {
[STATUS_OK] = "\033[22;32m OK \033[0m",
[STATUS_FAIL] ="\033[22;31mFAIL\033[0m",
[STATUS_WAIT] = "\033[22;33m .. \033[0m",
[STATUS_STARTED] ="\033[22;32m UP \033[0m",
};
static void print_status(const char *msg, int type, bool update)
{
if (update)
fputc('\r', stdout);
printf("[%s] %s", status_str[type], msg);
if (type != STATUS_WAIT)
fputc('\n', stdout);
fflush(stdout);
}
static svc_run_data_t *run_time_data_from_pid(pid_t pid)
{
size_t i;
for (i = 0; i < rt_count; ++i) {
if (rt_data[i].pid == pid)
return rt_data + i;
}
return NULL;
}
static void respawn(svc_run_data_t *rt)
{
if (rt->svc->rspwn_limit > 0) {
rt->rspwn_count += 1;
if (rt->rspwn_count >= rt->svc->rspwn_limit)
goto fail;
}
rt->pid = runsvc(rt->svc);
if (rt->pid == -1)
goto fail;
rt->state = STATE_RUNNING;
return;
fail:
print_status(rt->svc->desc, STATUS_FAIL, false);
rt->state = STATE_FAILED;
return;
}
void supervisor_handle_exited(pid_t pid, int status)
{
svc_run_data_t *rt = run_time_data_from_pid(pid);
service_t *svc;
if (rt == NULL)
return;
svc = rt->svc;
rt->status = status;
rt->pid = -1;
if (svc->type == SVC_RESPAWN) {
if (target != TGT_REBOOT && target != TGT_SHUTDOWN)
respawn(rt);
} else {
if (rt->status == EXIT_SUCCESS) {
rt->state = STATE_COMPLETED;
print_status(svc->desc, STATUS_OK,
svc->type == SVC_WAIT);
} else {
rt->state = STATE_FAILED;
print_status(svc->desc, STATUS_FAIL,
svc->type == SVC_WAIT);
}
waiting = false;
if (svc->type == SVC_ONCE)
singleshot -= 1;
if (singleshot == 0 && queue_idx >= queue_count[target] && !waiting)
target_completed(target);
}
}
void supervisor_set_target(int next)
{
if (target == TGT_REBOOT || target == TGT_SHUTDOWN || next == target)
return;
if (queue_idx < queue_count[target]) {
if (next != TGT_REBOOT && next != TGT_SHUTDOWN)
return;
}
target = next;
queue_idx = 0;
}
void supervisor_init(void)
{
int status = STATUS_FAIL;
service_t *it;
size_t i, j;
if (svcscan(SVCDIR, &cfg))
goto out;
/* allocate run time data */
rt_count = 0;
for (i = 0; i < TGT_MAX; ++i) {
for (it = cfg.targets[i]; it != NULL; it = it->next)
++rt_count;
}
rt_data = calloc(rt_count, sizeof(rt_data[0]));
if (rt_data == NULL) {
status = STATUS_FAIL;
rt_count = 0;
goto out;
}
/* map runtime data to services */
j = 0;
for (i = 0; i < TGT_MAX; ++i) {
queue_start[i] = j;
for (it = cfg.targets[i]; it != NULL; it = it->next) {
rt_data[j].svc = it;
rt_data[j].state = STATE_OFF;
rt_data[j].pid = -1;
++j;
}
queue_count[i] = j - queue_start[i];
}
/* initialize state */
singleshot = 0;
queue_idx = 0;
waiting = false;
target = TGT_BOOT;
status = STATUS_OK;
for (i = 0; i < queue_count[target]; ++i)
rt_data[queue_start[target] + i].state = STATE_QUEUED;
out:
print_status("reading configuration from " SVCDIR, status, false);
}
bool supervisor_process_queues(void)
{
sigset_t mask, old_mask;
svc_run_data_t *rt;
service_t *svc;
size_t count;
bool ret = false;
sigfillset(&mask);
sigprocmask(SIG_SETMASK, &mask, &old_mask);
if (waiting)
goto out_unblock;
count = queue_count[target];
if (queue_idx >= count)
goto out_unblock;
rt = rt_data + queue_start[target] + queue_idx++;
svc = rt->svc;
ret = true;
if (svc->flags & SVC_FLAG_HAS_EXEC) {
rt->pid = runsvc(rt->svc);
if (rt->pid == -1) {
rt->state = STATE_FAILED;
print_status(rt->svc->desc, STATUS_FAIL, false);
} else {
rt->state = STATE_RUNNING;
switch (svc->type) {
case SVC_WAIT:
print_status(svc->desc, STATUS_WAIT, false);
waiting = true;
break;
case SVC_RESPAWN:
print_status(svc->desc, STATUS_STARTED, false);
break;
case SVC_ONCE:
singleshot += 1;
break;
}
}
} else {
print_status(svc->desc, STATUS_OK, false);
rt->status = EXIT_SUCCESS;
rt->state = STATE_COMPLETED;
}
if (singleshot == 0 && !waiting && queue_idx >= count)
target_completed(target);
out_unblock:
sigprocmask(SIG_SETMASK, &old_mask, NULL);
return ret;
}
|
