Add ServiceManagement*() and their tests

util/mac/service_management.h

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_MAC_SERVICE_MANAGEMENT_H_
+#define CRASHPAD_UTIL_MAC_SERVICE_MANAGEMENT_H_
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <unistd.h>
+
+#include <string>
+
+namespace crashpad {
+
+//! \brief Submits a job to the user launchd domain as in `SMJobSubmit()`.
+//!
+//! \param[in] job_cf A dictionary describing a job.
+//!
+//! \return `true` if the job was submitted successfully, otherwise `false`.
+//!
+//! \note This function is provided because `SMJobSubmit()` does not exist prior
+//!     to Mac OS X 10.6, and behaves flakily on Mac OS X 10.10 DP5 14A314h in
+//!     that it hangs 25% of the time (radar 17365104).
+bool ServiceManagementSubmitJob(CFDictionaryRef job_cf);
+
+//! \brief Removes a job from the user launchd domain as in `SMJobRemove()`.
+//!
+//! \param[in] label The label for the job to remove.
+//! \param[in] wait `true` if this function should block, waiting for the job to
+//!     be removed. `false` if the job may be removed asynchronously.
+//!
+//! \return `true` if the job was removed successfully or if an asynchronous
+//!     attempt to remove the job was started successfully, otherwise `false`.
+//!
+//! \note This function is provided because `SMJobRemove()` does not exist prior
+//!     to Mac OS X 10.6, and when \a wait is true, blocks for far too long on
+//!     Mac OS X 10.10 DP5 14A314h (radar 17365104; `_block_until_job_exits()`
+//!     contains a one-second sleep() call).
+bool ServiceManagementRemoveJob(const std::string& label, bool wait);
+
+//! \brief Determines whether a specified job is loaded in the user launchd
+//!     domain.
+//!
+//! \param[in] label The label for the job to look up.
+//!
+//! \return `true` if the job is loaded, otherwise `false`.
+//!
+//! \note A loaded job is not necessarily presently running, nor has it
+//!     necessarily ever run in the past.
+//! \note This function is provided because `SMJobCopyDictionary()` does not
+//!     exist prior to Mac OS X 10.6, and on Mac OS X 10.10 DP5 14A314h, it
+//!     fails to return a job dictionary immediately after a job is loaded
+//!     (radar 17365104).
+bool ServiceManagementIsJobLoaded(const std::string& label);
+
+//! \brief Determines whether a specified job is running in the user launchd
+//!     domain.
+//!
+//! \param[in] label The label for the job to look up.
+//!
+//! \return The job’s process ID if running, otherwise `0`.
+//!
+//! \note This function is provided because `SMJobCopyDictionary()` does not
+//!     exist prior to Mac OS X 10.6, and on Mac OS X 10.10 DP5 14A314h, it
+//!     fails to return a job dictionary immediately after a job is loaded
+//!     (radar 17365104).
+pid_t ServiceManagementIsJobRunning(const std::string& label);
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_MAC_SERVICE_MANAGEMENT