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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/mac/launchd.h"
#include "base/logging.h"
#include "base/mac/scoped_launch_data.h"
namespace base {
namespace mac {
// MessageForJob sends a single message to launchd with a simple dictionary
// mapping |operation| to |job_label|, and returns the result of calling
// launch_msg to send that message. On failure, returns NULL. The caller
// assumes ownership of the returned launch_data_t object.
launch_data_t MessageForJob(const std::string& job_label,
const char* operation) {
// launch_data_alloc returns something that needs to be freed.
ScopedLaunchData message(launch_data_alloc(LAUNCH_DATA_DICTIONARY));
if (!message) {
LOG(ERROR) << "launch_data_alloc";
return NULL;
}
// launch_data_new_string returns something that needs to be freed, but
// the dictionary will assume ownership when launch_data_dict_insert is
// called, so put it in a scoper and .release() it when given to the
// dictionary.
ScopedLaunchData job_label_launchd(launch_data_new_string(job_label.c_str()));
if (!job_label_launchd) {
LOG(ERROR) << "launch_data_new_string";
return NULL;
}
if (!launch_data_dict_insert(message,
job_label_launchd.release(),
operation)) {
return NULL;
}
return launch_msg(message);
}
pid_t PIDForJob(const std::string& job_label) {
ScopedLaunchData response(MessageForJob(job_label, LAUNCH_KEY_GETJOB));
if (!response) {
return -1;
}
launch_data_type_t response_type = launch_data_get_type(response);
if (response_type != LAUNCH_DATA_DICTIONARY) {
if (response_type == LAUNCH_DATA_ERRNO) {
LOG(ERROR) << "PIDForJob: error " << launch_data_get_errno(response);
} else {
LOG(ERROR) << "PIDForJob: expected dictionary, got " << response_type;
}
return -1;
}
launch_data_t pid_data = launch_data_dict_lookup(response,
LAUNCH_JOBKEY_PID);
if (!pid_data)
return 0;
if (launch_data_get_type(pid_data) != LAUNCH_DATA_INTEGER) {
LOG(ERROR) << "PIDForJob: expected integer";
return -1;
}
return launch_data_get_integer(pid_data);
}
} // namespace mac
} // namespace base
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