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
10 namespace base {
11 namespace 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.
MessageForJob(const std::string & job_label,const char * operation)17 launch_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
PIDForJob(const std::string & job_label)45 pid_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