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// Copyright 2015 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 PROCESS_TOOLS_H__
#define PROCESS_TOOLS_H__
#include <string>
#include <vector>
#define S(x) #x
#define S_(x) S(x)
#define S__LINE__ S_(__LINE__)
#define DIE(...) \
{ \
fprintf(stderr, __FILE__ ":" S__LINE__ ": \"" __VA_ARGS__); \
fprintf(stderr, "\": "); \
perror(nullptr); \
exit(EXIT_FAILURE); \
}
#define PRINT_DEBUG(...) \
do { \
if (opt.debug) { \
fprintf(stderr, __FILE__ ":" S__LINE__ ": " __VA_ARGS__); \
fprintf(stderr, "\n"); \
} \
} while (0)
// Set the effective and saved uid / gid to the real uid / gid.
void DropPrivileges();
// Redirect the open file descriptor fd to the file target_path. Do nothing if
// target_path is '-'.
void Redirect(const std::string &target_path, int fd);
// Write formatted contents into the file filename.
void WriteFile(const std::string &filename, const char *fmt, ...);
// Receive SIGALRM after the given timeout. timeout_secs must be positive.
void SetTimeout(double timeout_secs);
// Installs a signal handler for signum and sets all signals to block during
// that signal.
void InstallSignalHandler(int signum, void (*handler)(int));
// Sets the signal handler of signum to SIG_IGN.
void IgnoreSignal(int signum);
// Reset the signal mask and restore the default handler for all signals.
void RestoreSignalHandlersAndMask();
// Ask the kernel to kill us with signum if our parent dies.
void KillMeWhenMyParentDies(int signum);
// This is the magic that makes waiting for all children (even grandchildren)
// work. By becoming a subreaper, all grandchildren that are not waited for by
// our direct child will be reparented to us, which allows us to wait for them.
void BecomeSubreaper();
// Forks and execvp's the process specified in args in its own process group.
// Returns the pid of the spawned process.
int SpawnCommand(const std::vector<char *> &args);
// Waits for child_pid to exit, then kills all remaining (grand)children, waits
// for them to exit, then returns the exitcode of child_pid.
int WaitForChild(int child_pid);
#endif // PROCESS_TOOLS_H__
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