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//===-- ExecuteFunction implementation for Unix-like Systems --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ExecuteFunction.h"
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <memory>
#include <poll.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
namespace __llvm_libc {
namespace testutils {
bool ProcessStatus::exited_normally() const {
return WIFEXITED(platform_defined);
}
int ProcessStatus::get_exit_code() const {
assert(exited_normally() && "Abnormal termination, no exit code");
return WEXITSTATUS(platform_defined);
}
int ProcessStatus::get_fatal_signal() const {
if (exited_normally())
return 0;
return WTERMSIG(platform_defined);
}
ProcessStatus invoke_in_subprocess(FunctionCaller *func, unsigned timeout_ms) {
std::unique_ptr<FunctionCaller> X(func);
int pipe_fds[2];
if (::pipe(pipe_fds) == -1)
return ProcessStatus::error("pipe(2) failed");
// Don't copy the buffers into the child process and print twice.
std::cout.flush();
std::cerr.flush();
pid_t pid = ::fork();
if (pid == -1)
return ProcessStatus::error("fork(2) failed");
if (!pid) {
(*func)();
std::exit(0);
}
::close(pipe_fds[1]);
struct pollfd poll_fd {
pipe_fds[0], 0, 0
};
// No events requested so this call will only return after the timeout or if
// the pipes peer was closed, signaling the process exited.
if (::poll(&poll_fd, 1, timeout_ms) == -1)
return ProcessStatus::error("poll(2) failed");
// If the pipe wasn't closed by the child yet then timeout has expired.
if (!(poll_fd.revents & POLLHUP)) {
::kill(pid, SIGKILL);
return ProcessStatus::timed_out_ps();
}
int wstatus = 0;
// Wait on the pid of the subprocess here so it gets collected by the system
// and doesn't turn into a zombie.
pid_t status = ::waitpid(pid, &wstatus, 0);
if (status == -1)
return ProcessStatus::error("waitpid(2) failed");
assert(status == pid);
return {wstatus};
}
const char *signal_as_string(int signum) { return ::strsignal(signum); }
} // namespace testutils
} // namespace __llvm_libc
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