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72 lines
1.9 KiB
72 lines
1.9 KiB
/* |
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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 <signal.h> |
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#include <string.h> |
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#include <sys/socket.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <android-base/logging.h> |
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#include "init.h" |
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#include "service.h" |
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namespace android { |
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namespace init { |
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static int signal_write_fd = -1; |
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static int signal_read_fd = -1; |
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static void handle_signal() { |
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// Clear outstanding requests. |
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char buf[32]; |
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read(signal_read_fd, buf, sizeof(buf)); |
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ServiceManager::GetInstance().ReapAnyOutstandingChildren(); |
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} |
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static void SIGCHLD_handler(int) { |
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if (TEMP_FAILURE_RETRY(write(signal_write_fd, "1", 1)) == -1) { |
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PLOG(ERROR) << "write(signal_write_fd) failed"; |
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} |
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} |
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void signal_handler_init() { |
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// Create a signalling mechanism for SIGCHLD. |
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int s[2]; |
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0, s) == -1) { |
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PLOG(ERROR) << "socketpair failed"; |
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exit(1); |
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} |
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signal_write_fd = s[0]; |
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signal_read_fd = s[1]; |
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// Write to signal_write_fd if we catch SIGCHLD. |
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struct sigaction act; |
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memset(&act, 0, sizeof(act)); |
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act.sa_handler = SIGCHLD_handler; |
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act.sa_flags = SA_NOCLDSTOP; |
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sigaction(SIGCHLD, &act, 0); |
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ServiceManager::GetInstance().ReapAnyOutstandingChildren(); |
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register_epoll_handler(signal_read_fd, handle_signal); |
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} |
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} // namespace init |
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} // namespace android
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