96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <algorithm>
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#include "base/logging.h"
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#include "build/build_config.h"
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#if defined(OS_POSIX)
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#if !defined(OS_FUCHSIA)
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#include <sys/resource.h>
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#endif // !OS_FUCHSIA
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#include <unistd.h>
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#elif defined(OS_WIN)
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#include <windows.h>
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#endif
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int main(int argc, char* argv[]) {
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#if defined(OS_POSIX)
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#if defined(OS_FUCHSIA)
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// getrlimit() is not implemented on Fuchsia. By construction, the child only
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// receieves specific fds that it's given, but check low values as mild
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// verification.
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int last_fd = 1024;
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#else
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rlimit rlimit_nofile;
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if (getrlimit(RLIMIT_NOFILE, &rlimit_nofile) != 0) {
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LOG(FATAL) << "getrlimit";
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}
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int last_fd = static_cast<int>(rlimit_nofile.rlim_cur);
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#endif // OS_FUCHSIA
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// Make sure that there’s nothing open at any FD higher than 3. All FDs other
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// than stdin, stdout, and stderr should have been closed prior to or at
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// exec().
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for (int fd = STDERR_FILENO + 1; fd < last_fd; ++fd) {
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if (close(fd) == 0 || errno != EBADF) {
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LOG(FATAL) << "close";
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}
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}
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// Read a byte from stdin, expecting it to be a specific value.
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char c;
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ssize_t rv = read(STDIN_FILENO, &c, 1);
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if (rv != 1 || c != 'z') {
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LOG(FATAL) << "read";
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}
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// Write a byte to stdout.
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c = 'Z';
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rv = write(STDOUT_FILENO, &c, 1);
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if (rv != 1) {
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LOG(FATAL) << "write";
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}
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#elif defined(OS_WIN)
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// TODO(scottmg): Verify that only the handles we expect to be open, are.
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// Read a byte from stdin, expecting it to be a specific value.
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char c;
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DWORD bytes_read;
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HANDLE stdin_handle = GetStdHandle(STD_INPUT_HANDLE);
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if (!ReadFile(stdin_handle, &c, 1, &bytes_read, nullptr) ||
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bytes_read != 1 || c != 'z') {
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LOG(FATAL) << "ReadFile";
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}
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// Write a byte to stdout.
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c = 'Z';
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DWORD bytes_written;
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if (!WriteFile(
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GetStdHandle(STD_OUTPUT_HANDLE), &c, 1, &bytes_written, nullptr) ||
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bytes_written != 1) {
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LOG(FATAL) << "WriteFile";
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}
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#endif // OS_POSIX
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return 0;
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}
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