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1/***
2 This file is part of systemd.
3
4 Copyright 2013 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18***/
19
20#include "sd-event.h"
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21
22#include "fd-util.h"
60f067b4 23#include "log.h"
e735f4d4 24#include "macro.h"
86f210e9 25#include "signal-util.h"
db2df898 26#include "util.h"
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27
28static int prepare_handler(sd_event_source *s, void *userdata) {
29 log_info("preparing %c", PTR_TO_INT(userdata));
30 return 1;
31}
32
33static bool got_a, got_b, got_c, got_unref;
34static unsigned got_d;
35
36static int unref_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
37 sd_event_source_unref(s);
38 got_unref = true;
39 return 0;
40}
41
42static int io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
43
44 log_info("got IO on %c", PTR_TO_INT(userdata));
45
46 if (userdata == INT_TO_PTR('a')) {
47 assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
48 assert_se(!got_a);
49 got_a = true;
50 } else if (userdata == INT_TO_PTR('b')) {
51 assert_se(!got_b);
52 got_b = true;
53 } else if (userdata == INT_TO_PTR('d')) {
54 got_d++;
55 if (got_d < 2)
56 assert_se(sd_event_source_set_enabled(s, SD_EVENT_ONESHOT) >= 0);
57 else
58 assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
59 } else
60 assert_not_reached("Yuck!");
61
62 return 1;
63}
64
65static int child_handler(sd_event_source *s, const siginfo_t *si, void *userdata) {
66
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67 assert_se(s);
68 assert_se(si);
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69
70 log_info("got child on %c", PTR_TO_INT(userdata));
71
e735f4d4 72 assert_se(userdata == INT_TO_PTR('f'));
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73
74 assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0);
75 sd_event_source_unref(s);
76
77 return 1;
78}
79
80static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
81 sd_event_source *p = NULL;
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82 pid_t pid;
83
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84 assert_se(s);
85 assert_se(si);
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86
87 log_info("got signal on %c", PTR_TO_INT(userdata));
88
e735f4d4 89 assert_se(userdata == INT_TO_PTR('e'));
60f067b4 90
86f210e9 91 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, -1) >= 0);
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92
93 pid = fork();
94 assert_se(pid >= 0);
95
96 if (pid == 0)
97 _exit(0);
98
99 assert_se(sd_event_add_child(sd_event_source_get_event(s), &p, pid, WEXITED, child_handler, INT_TO_PTR('f')) >= 0);
100 assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
101
102 sd_event_source_unref(s);
103
104 return 1;
105}
106
107static int defer_handler(sd_event_source *s, void *userdata) {
108 sd_event_source *p = NULL;
60f067b4 109
e735f4d4 110 assert_se(s);
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111
112 log_info("got defer on %c", PTR_TO_INT(userdata));
113
e735f4d4 114 assert_se(userdata == INT_TO_PTR('d'));
60f067b4 115
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116 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGUSR1, -1) >= 0);
117
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118 assert_se(sd_event_add_signal(sd_event_source_get_event(s), &p, SIGUSR1, signal_handler, INT_TO_PTR('e')) >= 0);
119 assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
120 raise(SIGUSR1);
121
122 sd_event_source_unref(s);
123
124 return 1;
125}
126
127static bool do_quit = false;
128
129static int time_handler(sd_event_source *s, uint64_t usec, void *userdata) {
130 log_info("got timer on %c", PTR_TO_INT(userdata));
131
132 if (userdata == INT_TO_PTR('c')) {
133
134 if (do_quit) {
135 sd_event_source *p;
136
137 assert_se(sd_event_add_defer(sd_event_source_get_event(s), &p, defer_handler, INT_TO_PTR('d')) >= 0);
138 assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0);
139 } else {
e735f4d4 140 assert_se(!got_c);
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141 got_c = true;
142 }
143 } else
144 assert_not_reached("Huh?");
145
146 return 2;
147}
148
149static bool got_exit = false;
150
151static int exit_handler(sd_event_source *s, void *userdata) {
152 log_info("got quit handler on %c", PTR_TO_INT(userdata));
153
154 got_exit = true;
155
156 return 3;
157}
158
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159static bool got_post = false;
160
161static int post_handler(sd_event_source *s, void *userdata) {
162 log_info("got post handler");
163
164 got_post = true;
165
166 return 2;
167}
168
d9dfd233 169static void test_basic(void) {
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170 sd_event *e = NULL;
171 sd_event_source *w = NULL, *x = NULL, *y = NULL, *z = NULL, *q = NULL, *t = NULL;
172 static const char ch = 'x';
173 int a[2] = { -1, -1 }, b[2] = { -1, -1}, d[2] = { -1, -1}, k[2] = { -1, -1 };
4c89c718 174 uint64_t event_now;
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175
176 assert_se(pipe(a) >= 0);
177 assert_se(pipe(b) >= 0);
178 assert_se(pipe(d) >= 0);
179 assert_se(pipe(k) >= 0);
180
181 assert_se(sd_event_default(&e) >= 0);
4c89c718 182 assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
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183
184 assert_se(sd_event_set_watchdog(e, true) >= 0);
185
186 /* Test whether we cleanly can destroy an io event source from its own handler */
187 got_unref = false;
188 assert_se(sd_event_add_io(e, &t, k[0], EPOLLIN, unref_handler, NULL) >= 0);
189 assert_se(write(k[1], &ch, 1) == 1);
190 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
191 assert_se(got_unref);
192
193 got_a = false, got_b = false, got_c = false, got_d = 0;
194
195 /* Add a oneshot handler, trigger it, re-enable it, and trigger
196 * it again. */
197 assert_se(sd_event_add_io(e, &w, d[0], EPOLLIN, io_handler, INT_TO_PTR('d')) >= 0);
198 assert_se(sd_event_source_set_enabled(w, SD_EVENT_ONESHOT) >= 0);
199 assert_se(write(d[1], &ch, 1) >= 0);
200 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
201 assert_se(got_d == 1);
202 assert_se(write(d[1], &ch, 1) >= 0);
203 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
204 assert_se(got_d == 2);
205
206 assert_se(sd_event_add_io(e, &x, a[0], EPOLLIN, io_handler, INT_TO_PTR('a')) >= 0);
207 assert_se(sd_event_add_io(e, &y, b[0], EPOLLIN, io_handler, INT_TO_PTR('b')) >= 0);
208 assert_se(sd_event_add_time(e, &z, CLOCK_MONOTONIC, 0, 0, time_handler, INT_TO_PTR('c')) >= 0);
209 assert_se(sd_event_add_exit(e, &q, exit_handler, INT_TO_PTR('g')) >= 0);
210
211 assert_se(sd_event_source_set_priority(x, 99) >= 0);
212 assert_se(sd_event_source_set_enabled(y, SD_EVENT_ONESHOT) >= 0);
213 assert_se(sd_event_source_set_prepare(x, prepare_handler) >= 0);
214 assert_se(sd_event_source_set_priority(z, 50) >= 0);
215 assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
216 assert_se(sd_event_source_set_prepare(z, prepare_handler) >= 0);
217
218 /* Test for floating event sources */
86f210e9 219 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+1, -1) >= 0);
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220 assert_se(sd_event_add_signal(e, NULL, SIGRTMIN+1, NULL, NULL) >= 0);
221
222 assert_se(write(a[1], &ch, 1) >= 0);
223 assert_se(write(b[1], &ch, 1) >= 0);
224
225 assert_se(!got_a && !got_b && !got_c);
226
227 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
228
229 assert_se(!got_a && got_b && !got_c);
230
231 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
232
233 assert_se(!got_a && got_b && got_c);
234
235 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
236
237 assert_se(got_a && got_b && got_c);
238
239 sd_event_source_unref(x);
240 sd_event_source_unref(y);
241
242 do_quit = true;
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243 assert_se(sd_event_add_post(e, NULL, post_handler, NULL) >= 0);
244 assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
245 assert_se(sd_event_source_set_time(z, event_now + 200 * USEC_PER_MSEC) >= 0);
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246 assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0);
247
248 assert_se(sd_event_loop(e) >= 0);
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249 assert_se(got_post);
250 assert_se(got_exit);
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251
252 sd_event_source_unref(z);
253 sd_event_source_unref(q);
254
255 sd_event_source_unref(w);
256
257 sd_event_unref(e);
258
259 safe_close_pair(a);
260 safe_close_pair(b);
261 safe_close_pair(d);
262 safe_close_pair(k);
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263}
264
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265static void test_sd_event_now(void) {
266 _cleanup_(sd_event_unrefp) sd_event *e = NULL;
267 uint64_t event_now;
268
269 assert_se(sd_event_new(&e) >= 0);
270 assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) > 0);
271 assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) > 0);
272 assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) > 0);
273 assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) > 0);
274 assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) > 0);
275 assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
276 assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
277
278 assert_se(sd_event_run(e, 0) == 0);
279
280 assert_se(sd_event_now(e, CLOCK_MONOTONIC, &event_now) == 0);
281 assert_se(sd_event_now(e, CLOCK_REALTIME, &event_now) == 0);
282 assert_se(sd_event_now(e, CLOCK_REALTIME_ALARM, &event_now) == 0);
283 assert_se(sd_event_now(e, CLOCK_BOOTTIME, &event_now) == 0);
284 assert_se(sd_event_now(e, CLOCK_BOOTTIME_ALARM, &event_now) == 0);
285 assert_se(sd_event_now(e, -1, &event_now) == -EOPNOTSUPP);
286 assert_se(sd_event_now(e, 900 /* arbitrary big number */, &event_now) == -EOPNOTSUPP);
287}
288
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289static int last_rtqueue_sigval = 0;
290static int n_rtqueue = 0;
291
292static int rtqueue_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
293 last_rtqueue_sigval = si->ssi_int;
294 n_rtqueue ++;
295 return 0;
296}
297
298static void test_rtqueue(void) {
299 sd_event_source *u = NULL, *v = NULL, *s = NULL;
300 sd_event *e = NULL;
301
302 assert_se(sd_event_default(&e) >= 0);
303
304 assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN+2, SIGRTMIN+3, SIGUSR2, -1) >= 0);
305 assert_se(sd_event_add_signal(e, &u, SIGRTMIN+2, rtqueue_handler, NULL) >= 0);
306 assert_se(sd_event_add_signal(e, &v, SIGRTMIN+3, rtqueue_handler, NULL) >= 0);
307 assert_se(sd_event_add_signal(e, &s, SIGUSR2, rtqueue_handler, NULL) >= 0);
308
309 assert_se(sd_event_source_set_priority(v, -10) >= 0);
310
311 assert(sigqueue(getpid(), SIGRTMIN+2, (union sigval) { .sival_int = 1 }) >= 0);
312 assert(sigqueue(getpid(), SIGRTMIN+3, (union sigval) { .sival_int = 2 }) >= 0);
313 assert(sigqueue(getpid(), SIGUSR2, (union sigval) { .sival_int = 3 }) >= 0);
314 assert(sigqueue(getpid(), SIGRTMIN+3, (union sigval) { .sival_int = 4 }) >= 0);
315 assert(sigqueue(getpid(), SIGUSR2, (union sigval) { .sival_int = 5 }) >= 0);
316
317 assert_se(n_rtqueue == 0);
318 assert_se(last_rtqueue_sigval == 0);
319
320 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
321 assert_se(n_rtqueue == 1);
322 assert_se(last_rtqueue_sigval == 2); /* first SIGRTMIN+3 */
323
324 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
325 assert_se(n_rtqueue == 2);
326 assert_se(last_rtqueue_sigval == 4); /* second SIGRTMIN+3 */
327
328 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
329 assert_se(n_rtqueue == 3);
330 assert_se(last_rtqueue_sigval == 3); /* first SIGUSR2 */
331
332 assert_se(sd_event_run(e, (uint64_t) -1) >= 1);
333 assert_se(n_rtqueue == 4);
334 assert_se(last_rtqueue_sigval == 1); /* SIGRTMIN+2 */
335
336 assert_se(sd_event_run(e, 0) == 0); /* the other SIGUSR2 is dropped, because the first one was still queued */
337 assert_se(n_rtqueue == 4);
338 assert_se(last_rtqueue_sigval == 1);
339
340 sd_event_source_unref(u);
341 sd_event_source_unref(v);
342 sd_event_source_unref(s);
343
344 sd_event_unref(e);
345}
346
347int main(int argc, char *argv[]) {
348
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349 log_set_max_level(LOG_DEBUG);
350 log_parse_environment();
351
d9dfd233 352 test_basic();
4c89c718 353 test_sd_event_now();
d9dfd233 354 test_rtqueue();
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355
356 return 0;
357}