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52064fdd1b
TEST=util_test MultiprocessExec.* R=rsesek@chromium.org Review URL: https://codereview.chromium.org/531203002
52 lines
1.5 KiB
C++
52 lines
1.5 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 <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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int main(int argc, char* argv[]) {
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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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int max_fd = std::max(static_cast<int>(sysconf(_SC_OPEN_MAX)), OPEN_MAX);
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max_fd = std::max(max_fd, getdtablesize());
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for (int fd = STDERR_FILENO + 1; fd < max_fd; ++fd) {
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if (close(fd) == 0 || errno != EBADF) {
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abort();
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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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abort();
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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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abort();
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}
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return 0;
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}
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