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Diffstat (limited to 'src/main/tools/process-wrapper-legacy.h')
-rw-r--r-- | src/main/tools/process-wrapper-legacy.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/main/tools/process-wrapper-legacy.h b/src/main/tools/process-wrapper-legacy.h new file mode 100644 index 0000000000..5cea547175 --- /dev/null +++ b/src/main/tools/process-wrapper-legacy.h @@ -0,0 +1,49 @@ +// Copyright 2017 The Bazel 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 SRC_MAIN_TOOLS_PROCESS_WRAPPER_LEGACY_H_ +#define SRC_MAIN_TOOLS_PROCESS_WRAPPER_LEGACY_H_ + +#include <signal.h> +#include <vector> + +// The process-wrapper implementation that was used until and including Bazel +// 0.4.5. Waits for the wrapped process to exit and then kills its process +// group. Works on all POSIX operating systems (tested on Linux, macOS, +// FreeBSD). +// +// Caveats: +// - Killing just the process group of the spawned child means that daemons or +// other processes spawned by the child may not be killed if they change their +// process group. +// - Does not wait for grandchildren to exit, thus processes spawned by the +// child that could not be killed will linger around in the background. +// - Has a PID reuse race condition, because the kill() to the process group is +// sent after waitpid() was called on the main child. +class LegacyProcessWrapper { + public: + // Run the command specified in the `opt.args` array and kill it after + // `opt.timeout_secs` seconds. + static void RunCommand(); + + private: + static void SpawnChild(); + static void WaitForChild(); + static void OnSignal(int sig); + + static pid_t child_pid; + static volatile sig_atomic_t last_signal; +}; + +#endif |