76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "tools/android/common/daemon.h"
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#include <signal.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "base/command_line.h"
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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namespace {
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const char kNoSpawnDaemon[] = "D";
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int g_exit_status = 0;
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void Exit(int unused) {
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_exit(g_exit_status);
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}
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void CloseFileDescriptor(int fd) {
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int old_errno = errno;
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(void) HANDLE_EINTR(close(fd));
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errno = old_errno;
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}
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} // namespace
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namespace tools {
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bool HasHelpSwitch(const CommandLine& command_line) {
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return command_line.HasSwitch("h") || command_line.HasSwitch("help");
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}
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bool HasNoSpawnDaemonSwitch(const CommandLine& command_line) {
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return command_line.HasSwitch(kNoSpawnDaemon);
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}
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void ShowHelp(const char* program,
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const char* extra_title,
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const char* extra_descriptions) {
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printf("Usage: %s [-%s] %s\n"
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" -%s stops from spawning a daemon process\n%s",
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program, kNoSpawnDaemon, extra_title, kNoSpawnDaemon,
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extra_descriptions);
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}
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void SpawnDaemon(int exit_status) {
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g_exit_status = exit_status;
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signal(SIGUSR1, Exit);
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if (fork()) {
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// In parent process.
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sleep(10); // Wait for the child process to finish setsid().
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NOTREACHED();
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}
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// In child process.
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setsid(); // Detach the child process from its parent.
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kill(getppid(), SIGUSR1); // Inform the parent process to exit.
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// Close the standard input and outputs, otherwise the process may block
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// adbd when the shell exits.
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// Comment out these lines if you want to see outputs for debugging.
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CloseFileDescriptor(0);
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CloseFileDescriptor(1);
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CloseFileDescriptor(2);
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}
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} // namespace tools
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