82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
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// Copyright 2012 The Chromium Authors
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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 "base/mac/launchd.h"
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#include "base/logging.h"
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#include "base/mac/scoped_launch_data.h"
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#include "base/numerics/safe_conversions.h"
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// This file is written in terms of launch_data_t, which is deprecated but has
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// no replacement. Ignore the deprecation warnings for now.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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namespace base::mac {
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// MessageForJob sends a single message to launchd with a simple dictionary
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// mapping |operation| to |job_label|, and returns the result of calling
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// launch_msg to send that message. On failure, returns NULL. The caller
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// assumes ownership of the returned launch_data_t object.
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launch_data_t MessageForJob(const std::string& job_label,
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const char* operation) {
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// launch_data_alloc returns something that needs to be freed.
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ScopedLaunchData message(launch_data_alloc(LAUNCH_DATA_DICTIONARY));
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if (!message.is_valid()) {
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LOG(ERROR) << "launch_data_alloc";
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return NULL;
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}
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// launch_data_new_string returns something that needs to be freed, but
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// the dictionary will assume ownership when launch_data_dict_insert is
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// called, so put it in a scoper and .release() it when given to the
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// dictionary.
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ScopedLaunchData job_label_launchd(launch_data_new_string(job_label.c_str()));
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if (!job_label_launchd.is_valid()) {
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LOG(ERROR) << "launch_data_new_string";
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return NULL;
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}
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if (!launch_data_dict_insert(message.get(), job_label_launchd.release(),
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operation)) {
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return NULL;
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}
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return launch_msg(message.get());
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}
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pid_t PIDForJob(const std::string& job_label) {
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ScopedLaunchData response(MessageForJob(job_label, LAUNCH_KEY_GETJOB));
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if (!response.is_valid()) {
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return -1;
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}
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launch_data_type_t response_type = launch_data_get_type(response.get());
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if (response_type != LAUNCH_DATA_DICTIONARY) {
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if (response_type == LAUNCH_DATA_ERRNO) {
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LOG(ERROR) << "PIDForJob: error "
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<< launch_data_get_errno(response.get());
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} else {
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LOG(ERROR) << "PIDForJob: expected dictionary, got " << response_type;
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}
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return -1;
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}
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launch_data_t pid_data =
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launch_data_dict_lookup(response.get(), LAUNCH_JOBKEY_PID);
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if (!pid_data)
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return 0;
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if (launch_data_get_type(pid_data) != LAUNCH_DATA_INTEGER) {
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LOG(ERROR) << "PIDForJob: expected integer";
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return -1;
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}
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return checked_cast<pid_t>(launch_data_get_integer(pid_data));
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}
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} // namespace base::mac
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#pragma clang diagnostic pop
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