139 lines
3.3 KiB
C++
139 lines
3.3 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2016 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "shrpx_exec.h"
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#include <cerrno>
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#include "shrpx_signal.h"
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#include "shrpx_log.h"
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#include "util.h"
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#include "template.h"
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using namespace nghttp2;
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namespace shrpx {
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// inspired by h2o_read_command function from h2o project:
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// https://github.com/h2o/h2o
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int exec_read_command(Process &proc, char *const argv[]) {
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int rv;
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int pfd[2];
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#ifdef O_CLOEXEC
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if (pipe2(pfd, O_CLOEXEC) == -1) {
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return -1;
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}
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#else // !O_CLOEXEC
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if (pipe(pfd) == -1) {
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return -1;
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}
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util::make_socket_closeonexec(pfd[0]);
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util::make_socket_closeonexec(pfd[1]);
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#endif // !O_CLOEXEC
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auto closer = defer([&pfd]() {
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if (pfd[0] != -1) {
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close(pfd[0]);
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}
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if (pfd[1] != -1) {
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close(pfd[1]);
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}
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});
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sigset_t oldset;
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rv = shrpx_signal_block_all(&oldset);
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if (rv != 0) {
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auto error = errno;
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LOG(ERROR) << "Blocking all signals failed: errno=" << error;
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return -1;
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}
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auto pid = fork();
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if (pid == 0) {
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// This is multithreaded program, and we are allowed to use only
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// async-signal-safe functions here.
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// child process
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shrpx_signal_unset_worker_proc_ign_handler();
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rv = shrpx_signal_unblock_all();
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if (rv != 0) {
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constexpr char msg[] = "Unblocking all signals failed\n";
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while (write(STDERR_FILENO, msg, str_size(msg)) == -1 && errno == EINTR)
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;
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nghttp2_Exit(EXIT_FAILURE);
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}
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dup2(pfd[1], 1);
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close(pfd[0]);
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rv = execv(argv[0], argv);
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if (rv == -1) {
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constexpr char msg[] = "Could not execute command\n";
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while (write(STDERR_FILENO, msg, str_size(msg)) == -1 && errno == EINTR)
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;
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nghttp2_Exit(EXIT_FAILURE);
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}
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// unreachable
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}
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// parent process
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if (pid == -1) {
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auto error = errno;
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LOG(ERROR) << "Could not execute command: " << argv[0]
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<< ", fork() failed, errno=" << error;
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}
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rv = shrpx_signal_set(&oldset);
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if (rv != 0) {
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auto error = errno;
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LOG(FATAL) << "Restoring all signals failed: errno=" << error;
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nghttp2_Exit(EXIT_FAILURE);
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}
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if (pid == -1) {
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return -1;
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}
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close(pfd[1]);
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pfd[1] = -1;
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util::make_socket_nonblocking(pfd[0]);
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proc.pid = pid;
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proc.rfd = pfd[0];
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pfd[0] = -1;
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return 0;
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}
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} // namespace shrpx
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