1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/mac/launchd.h"
6
7#include "base/logging.h"
8#include "base/mac/scoped_launch_data.h"
9
10namespace base {
11namespace mac {
12
13// MessageForJob sends a single message to launchd with a simple dictionary
14// mapping |operation| to |job_label|, and returns the result of calling
15// launch_msg to send that message. On failure, returns NULL. The caller
16// assumes ownership of the returned launch_data_t object.
17launch_data_t MessageForJob(const std::string& job_label,
18                            const char* operation) {
19  // launch_data_alloc returns something that needs to be freed.
20  ScopedLaunchData message(launch_data_alloc(LAUNCH_DATA_DICTIONARY));
21  if (!message) {
22    LOG(ERROR) << "launch_data_alloc";
23    return NULL;
24  }
25
26  // launch_data_new_string returns something that needs to be freed, but
27  // the dictionary will assume ownership when launch_data_dict_insert is
28  // called, so put it in a scoper and .release() it when given to the
29  // dictionary.
30  ScopedLaunchData job_label_launchd(launch_data_new_string(job_label.c_str()));
31  if (!job_label_launchd) {
32    LOG(ERROR) << "launch_data_new_string";
33    return NULL;
34  }
35
36  if (!launch_data_dict_insert(message,
37                               job_label_launchd.release(),
38                               operation)) {
39    return NULL;
40  }
41
42  return launch_msg(message);
43}
44
45pid_t PIDForJob(const std::string& job_label) {
46  ScopedLaunchData response(MessageForJob(job_label, LAUNCH_KEY_GETJOB));
47  if (!response) {
48    return -1;
49  }
50
51  launch_data_type_t response_type = launch_data_get_type(response);
52  if (response_type != LAUNCH_DATA_DICTIONARY) {
53    if (response_type == LAUNCH_DATA_ERRNO) {
54      LOG(ERROR) << "PIDForJob: error " << launch_data_get_errno(response);
55    } else {
56      LOG(ERROR) << "PIDForJob: expected dictionary, got " << response_type;
57    }
58    return -1;
59  }
60
61  launch_data_t pid_data = launch_data_dict_lookup(response,
62                                                   LAUNCH_JOBKEY_PID);
63  if (!pid_data)
64    return 0;
65
66  if (launch_data_get_type(pid_data) != LAUNCH_DATA_INTEGER) {
67    LOG(ERROR) << "PIDForJob: expected integer";
68    return -1;
69  }
70
71  return launch_data_get_integer(pid_data);
72}
73
74}  // namespace mac
75}  // namespace base
76