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. 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 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
