160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <cutils/sockets.h>
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#include <sys/reboot.h>
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#include "init.h"
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#include "list.h"
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#include "util.h"
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#include "log.h"
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static int signal_fd = -1;
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static int signal_recv_fd = -1;
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static void sigchld_handler(int s)
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{
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write(signal_fd, &s, 1);
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}
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#define CRITICAL_CRASH_THRESHOLD 4 /* if we crash >4 times ... */
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#define CRITICAL_CRASH_WINDOW (4*60) /* ... in 4 minutes, goto recovery*/
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static int wait_for_one_process(int block)
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{
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pid_t pid;
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int status;
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struct service *svc;
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struct socketinfo *si;
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time_t now;
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struct listnode *node;
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struct command *cmd;
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while ( (pid = waitpid(-1, &status, block ? 0 : WNOHANG)) == -1 && errno == EINTR );
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if (pid <= 0) return -1;
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INFO("waitpid returned pid %d, status = %08x\n", pid, status);
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svc = service_find_by_pid(pid);
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if (!svc) {
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ERROR("untracked pid %d exited\n", pid);
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return 0;
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}
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NOTICE("process '%s', pid %d exited\n", svc->name, pid);
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if (!(svc->flags & SVC_ONESHOT)) {
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kill(-pid, SIGKILL);
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NOTICE("process '%s' killing any children in process group\n", svc->name);
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}
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/* remove any sockets we may have created */
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for (si = svc->sockets; si; si = si->next) {
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char tmp[128];
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snprintf(tmp, sizeof(tmp), ANDROID_SOCKET_DIR"/%s", si->name);
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unlink(tmp);
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}
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svc->pid = 0;
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svc->flags &= (~SVC_RUNNING);
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/* oneshot processes go into the disabled state on exit */
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if (svc->flags & SVC_ONESHOT) {
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svc->flags |= SVC_DISABLED;
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}
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/* disabled processes do not get restarted automatically */
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if (svc->flags & SVC_DISABLED) {
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notify_service_state(svc->name, "stopped");
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return 0;
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}
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now = gettime();
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if (svc->flags & SVC_CRITICAL) {
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if (svc->time_crashed + CRITICAL_CRASH_WINDOW >= now) {
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if (++svc->nr_crashed > CRITICAL_CRASH_THRESHOLD) {
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ERROR("critical process '%s' exited %d times in %d minutes; "
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"rebooting into recovery mode\n", svc->name,
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CRITICAL_CRASH_THRESHOLD, CRITICAL_CRASH_WINDOW / 60);
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sync();
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__reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2,
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LINUX_REBOOT_CMD_RESTART2, "recovery");
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return 0;
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}
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} else {
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svc->time_crashed = now;
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svc->nr_crashed = 1;
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}
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}
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svc->flags |= SVC_RESTARTING;
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/* Execute all onrestart commands for this service. */
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list_for_each(node, &svc->onrestart.commands) {
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cmd = node_to_item(node, struct command, clist);
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cmd->func(cmd->nargs, cmd->args);
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}
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notify_service_state(svc->name, "restarting");
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return 0;
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}
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void handle_signal(void)
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{
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char tmp[32];
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/* we got a SIGCHLD - reap and restart as needed */
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read(signal_recv_fd, tmp, sizeof(tmp));
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while (!wait_for_one_process(0))
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;
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}
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void signal_init(void)
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{
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int s[2];
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struct sigaction act;
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act.sa_handler = sigchld_handler;
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act.sa_flags = SA_NOCLDSTOP;
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act.sa_mask = 0;
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act.sa_restorer = NULL;
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sigaction(SIGCHLD, &act, 0);
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/* create a signalling mechanism for the sigchld handler */
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) == 0) {
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signal_fd = s[0];
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signal_recv_fd = s[1];
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fcntl(s[0], F_SETFD, FD_CLOEXEC);
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fcntl(s[0], F_SETFL, O_NONBLOCK);
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fcntl(s[1], F_SETFD, FD_CLOEXEC);
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fcntl(s[1], F_SETFL, O_NONBLOCK);
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}
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handle_signal();
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}
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int get_signal_fd()
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{
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return signal_recv_fd;
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}
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