/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include "sd-event.h" #include "log.h" #include "util.h" static int prepare_handler(sd_event_source *s, void *userdata) { log_info("preparing %c", PTR_TO_INT(userdata)); return 1; } static bool got_a, got_b, got_c, got_unref; static unsigned got_d; static int unref_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { sd_event_source_unref(s); got_unref = true; return 0; } static int io_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { log_info("got IO on %c", PTR_TO_INT(userdata)); if (userdata == INT_TO_PTR('a')) { assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0); assert_se(!got_a); got_a = true; } else if (userdata == INT_TO_PTR('b')) { assert_se(!got_b); got_b = true; } else if (userdata == INT_TO_PTR('d')) { got_d++; if (got_d < 2) assert_se(sd_event_source_set_enabled(s, SD_EVENT_ONESHOT) >= 0); else assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0); } else assert_not_reached("Yuck!"); return 1; } static int child_handler(sd_event_source *s, const siginfo_t *si, void *userdata) { assert(s); assert(si); log_info("got child on %c", PTR_TO_INT(userdata)); assert(userdata == INT_TO_PTR('f')); assert_se(sd_event_exit(sd_event_source_get_event(s), 0) >= 0); sd_event_source_unref(s); return 1; } static int signal_handler(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { sd_event_source *p = NULL; sigset_t ss; pid_t pid; assert(s); assert(si); log_info("got signal on %c", PTR_TO_INT(userdata)); assert(userdata == INT_TO_PTR('e')); assert_se(sigemptyset(&ss) >= 0); assert_se(sigaddset(&ss, SIGCHLD) >= 0); assert_se(sigprocmask(SIG_BLOCK, &ss, NULL) >= 0); pid = fork(); assert_se(pid >= 0); if (pid == 0) _exit(0); assert_se(sd_event_add_child(sd_event_source_get_event(s), &p, pid, WEXITED, child_handler, INT_TO_PTR('f')) >= 0); assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0); sd_event_source_unref(s); return 1; } static int defer_handler(sd_event_source *s, void *userdata) { sd_event_source *p = NULL; sigset_t ss; assert(s); log_info("got defer on %c", PTR_TO_INT(userdata)); assert(userdata == INT_TO_PTR('d')); assert_se(sigemptyset(&ss) >= 0); assert_se(sigaddset(&ss, SIGUSR1) >= 0); assert_se(sigprocmask(SIG_BLOCK, &ss, NULL) >= 0); assert_se(sd_event_add_signal(sd_event_source_get_event(s), &p, SIGUSR1, signal_handler, INT_TO_PTR('e')) >= 0); assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0); raise(SIGUSR1); sd_event_source_unref(s); return 1; } static bool do_quit = false; static int time_handler(sd_event_source *s, uint64_t usec, void *userdata) { log_info("got timer on %c", PTR_TO_INT(userdata)); if (userdata == INT_TO_PTR('c')) { if (do_quit) { sd_event_source *p; assert_se(sd_event_add_defer(sd_event_source_get_event(s), &p, defer_handler, INT_TO_PTR('d')) >= 0); assert_se(sd_event_source_set_enabled(p, SD_EVENT_ONESHOT) >= 0); } else { assert(!got_c); got_c = true; } } else assert_not_reached("Huh?"); return 2; } static bool got_exit = false; static int exit_handler(sd_event_source *s, void *userdata) { log_info("got quit handler on %c", PTR_TO_INT(userdata)); got_exit = true; return 3; } int main(int argc, char *argv[]) { sd_event *e = NULL; sd_event_source *w = NULL, *x = NULL, *y = NULL, *z = NULL, *q = NULL, *t = NULL; static const char ch = 'x'; int a[2] = { -1, -1 }, b[2] = { -1, -1}, d[2] = { -1, -1}, k[2] = { -1, -1 }; assert_se(pipe(a) >= 0); assert_se(pipe(b) >= 0); assert_se(pipe(d) >= 0); assert_se(pipe(k) >= 0); assert_se(sd_event_default(&e) >= 0); assert_se(sd_event_set_watchdog(e, true) >= 0); /* Test whether we cleanly can destroy an io event source from its own handler */ got_unref = false; assert_se(sd_event_add_io(e, &t, k[0], EPOLLIN, unref_handler, NULL) >= 0); assert_se(write(k[1], &ch, 1) == 1); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_unref); got_a = false, got_b = false, got_c = false, got_d = 0; /* Add a oneshot handler, trigger it, re-enable it, and trigger * it again. */ assert_se(sd_event_add_io(e, &w, d[0], EPOLLIN, io_handler, INT_TO_PTR('d')) >= 0); assert_se(sd_event_source_set_enabled(w, SD_EVENT_ONESHOT) >= 0); assert_se(write(d[1], &ch, 1) >= 0); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_d == 1); assert_se(write(d[1], &ch, 1) >= 0); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_d == 2); assert_se(sd_event_add_io(e, &x, a[0], EPOLLIN, io_handler, INT_TO_PTR('a')) >= 0); assert_se(sd_event_add_io(e, &y, b[0], EPOLLIN, io_handler, INT_TO_PTR('b')) >= 0); assert_se(sd_event_add_time(e, &z, CLOCK_MONOTONIC, 0, 0, time_handler, INT_TO_PTR('c')) >= 0); assert_se(sd_event_add_exit(e, &q, exit_handler, INT_TO_PTR('g')) >= 0); assert_se(sd_event_source_set_priority(x, 99) >= 0); assert_se(sd_event_source_set_enabled(y, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_source_set_prepare(x, prepare_handler) >= 0); assert_se(sd_event_source_set_priority(z, 50) >= 0); assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_source_set_prepare(z, prepare_handler) >= 0); assert_se(write(a[1], &ch, 1) >= 0); assert_se(write(b[1], &ch, 1) >= 0); assert_se(!got_a && !got_b && !got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(!got_a && got_b && !got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(!got_a && got_b && got_c); assert_se(sd_event_run(e, (uint64_t) -1) >= 1); assert_se(got_a && got_b && got_c); sd_event_source_unref(x); sd_event_source_unref(y); do_quit = true; assert_se(sd_event_source_set_time(z, now(CLOCK_MONOTONIC) + 200 * USEC_PER_MSEC) >= 0); assert_se(sd_event_source_set_enabled(z, SD_EVENT_ONESHOT) >= 0); assert_se(sd_event_loop(e) >= 0); sd_event_source_unref(z); sd_event_source_unref(q); sd_event_source_unref(w); sd_event_unref(e); safe_close_pair(a); safe_close_pair(b); safe_close_pair(d); safe_close_pair(k); return 0; }