diff options
Diffstat (limited to 'init/signal_handler.c')
| -rw-r--r-- | init/signal_handler.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/init/signal_handler.c b/init/signal_handler.c deleted file mode 100644 index 7e8e1a7..0000000 --- a/init/signal_handler.c +++ /dev/null @@ -1,165 +0,0 @@ -/* - * Copyright (C) 2010 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include <stdio.h> -#include <errno.h> -#include <signal.h> -#include <unistd.h> -#include <fcntl.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/wait.h> -#include <cutils/sockets.h> -#include <cutils/android_reboot.h> -#include <cutils/list.h> - -#include "init.h" -#include "util.h" -#include "log.h" - -static int signal_fd = -1; -static int signal_recv_fd = -1; - -static void sigchld_handler(int s) -{ - write(signal_fd, &s, 1); -} - -#define CRITICAL_CRASH_THRESHOLD 4 /* if we crash >4 times ... */ -#define CRITICAL_CRASH_WINDOW (4*60) /* ... in 4 minutes, goto recovery*/ - -static int wait_for_one_process(int block) -{ - pid_t pid; - int status; - struct service *svc; - struct socketinfo *si; - time_t now; - struct listnode *node; - struct command *cmd; - - while ( (pid = waitpid(-1, &status, block ? 0 : WNOHANG)) == -1 && errno == EINTR ); - if (pid <= 0) return -1; - INFO("waitpid returned pid %d, status = %08x\n", pid, status); - - svc = service_find_by_pid(pid); - if (!svc) { - if (WIFEXITED(status)) { - ERROR("untracked pid %d exited with status %d\n", pid, WEXITSTATUS(status)); - } else if (WIFSIGNALED(status)) { - ERROR("untracked pid %d killed by signal %d\n", pid, WTERMSIG(status)); - } else if (WIFSTOPPED(status)) { - ERROR("untracked pid %d stopped by signal %d\n", pid, WSTOPSIG(status)); - } else { - ERROR("untracked pid %d state changed\n", pid); - } - return 0; - } - - NOTICE("process '%s', pid %d exited\n", svc->name, pid); - - if (!(svc->flags & SVC_ONESHOT) || (svc->flags & SVC_RESTART)) { - kill(-pid, SIGKILL); - NOTICE("process '%s' killing any children in process group\n", svc->name); - } - - /* remove any sockets we may have created */ - for (si = svc->sockets; si; si = si->next) { - char tmp[128]; - snprintf(tmp, sizeof(tmp), ANDROID_SOCKET_DIR"/%s", si->name); - unlink(tmp); - } - - svc->pid = 0; - svc->flags &= (~SVC_RUNNING); - - /* oneshot processes go into the disabled state on exit, - * except when manually restarted. */ - if ((svc->flags & SVC_ONESHOT) && !(svc->flags & SVC_RESTART)) { - svc->flags |= SVC_DISABLED; - } - - /* disabled and reset processes do not get restarted automatically */ - if (svc->flags & (SVC_DISABLED | SVC_RESET) ) { - notify_service_state(svc->name, "stopped"); - return 0; - } - - now = gettime(); - if ((svc->flags & SVC_CRITICAL) && !(svc->flags & SVC_RESTART)) { - if (svc->time_crashed + CRITICAL_CRASH_WINDOW >= now) { - if (++svc->nr_crashed > CRITICAL_CRASH_THRESHOLD) { - ERROR("critical process '%s' exited %d times in %d minutes; " - "rebooting into recovery mode\n", svc->name, - CRITICAL_CRASH_THRESHOLD, CRITICAL_CRASH_WINDOW / 60); - android_reboot(ANDROID_RB_RESTART2, 0, "recovery"); - return 0; - } - } else { - svc->time_crashed = now; - svc->nr_crashed = 1; - } - } - - svc->flags &= (~SVC_RESTART); - svc->flags |= SVC_RESTARTING; - - /* Execute all onrestart commands for this service. */ - list_for_each(node, &svc->onrestart.commands) { - cmd = node_to_item(node, struct command, clist); - cmd->func(cmd->nargs, cmd->args); - } - notify_service_state(svc->name, "restarting"); - return 0; -} - -void handle_signal(void) -{ - char tmp[32]; - - /* we got a SIGCHLD - reap and restart as needed */ - read(signal_recv_fd, tmp, sizeof(tmp)); - while (!wait_for_one_process(0)) - ; -} - -void signal_init(void) -{ - int s[2]; - - struct sigaction act; - memset(&act, 0, sizeof(act)); - act.sa_handler = sigchld_handler; - act.sa_flags = SA_NOCLDSTOP; - sigaction(SIGCHLD, &act, 0); - - /* create a signalling mechanism for the sigchld handler */ - if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) == 0) { - signal_fd = s[0]; - signal_recv_fd = s[1]; - fcntl(s[0], F_SETFD, FD_CLOEXEC); - fcntl(s[0], F_SETFL, O_NONBLOCK); - fcntl(s[1], F_SETFD, FD_CLOEXEC); - fcntl(s[1], F_SETFL, O_NONBLOCK); - } - - handle_signal(); -} - -int get_signal_fd() -{ - return signal_recv_fd; -} |