mirror of
https://github.com/LadybirdBrowser/ladybird.git
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123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
/*
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* Copyright (c) 2023, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/LexicalPath.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <stdlib.h>
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#include <unistd.h>
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namespace {
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void dup_out_file(int fd_to_redirect)
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{
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int fd = -1;
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ByteString path = "nohup.out";
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auto options = O_CREAT | O_WRONLY | O_APPEND;
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auto mode = S_IRUSR | S_IWUSR;
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auto fd_or_error = Core::System::open(path, options, mode);
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if (fd_or_error.is_error()) {
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auto* home_env = getenv("HOME");
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if (!home_env) {
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warnln("nohup: unable to open for appending as $HOME is not set");
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exit(127);
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}
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path = LexicalPath::join(LexicalPath::canonicalized_path(home_env), path).string();
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fd_or_error = Core::System::open(path, options, mode);
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if (fd_or_error.is_error()) {
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warnln("nohup: unable to open {} for appending: {}", path, strerror(fd_or_error.error().code()));
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exit(127);
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}
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}
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fd = fd_or_error.value();
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auto maybe_error = Core::System::dup2(fd, fd_to_redirect);
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if (maybe_error.is_error()) {
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warnln("nohup: redirection failed: {}", strerror(maybe_error.error().code()));
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exit(127);
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}
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MUST(Core::System::close(fd));
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if (fd_to_redirect != STDERR_FILENO)
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outln(stderr, "appending output to {}", path);
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}
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Main::set_return_code_for_errors(127);
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TRY(Core::System::pledge("stdio wpath cpath rpath exec sigaction"));
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StringView utility;
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Vector<StringView> args;
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Core::ArgsParser args_parser;
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args_parser.set_stop_on_first_non_option(true);
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args_parser.set_general_help("Invoke a utility that will ignore SIGHUPs");
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args_parser.add_positional_argument(utility, "Utility to be invoked", "utility");
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args_parser.add_positional_argument(args, "Arguments to pass to utility", "args", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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auto stdout_is_a_tty = false;
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auto tty_or_error = Core::System::isatty(STDOUT_FILENO);
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if (tty_or_error.is_error()) {
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auto error = tty_or_error.release_error();
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if (error.code() != EBADF) {
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warnln("nohup: error while performing tty check on stdout: {}", strerror(error.code()));
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return 127;
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}
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} else {
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stdout_is_a_tty = tty_or_error.value();
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}
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if (stdout_is_a_tty)
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dup_out_file(STDOUT_FILENO);
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auto stderr_is_a_tty = false;
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tty_or_error = Core::System::isatty(STDERR_FILENO);
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if (tty_or_error.is_error()) {
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auto error = tty_or_error.release_error();
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if (error.code() != EBADF) {
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warnln("nohup: error while performing tty check on stderr: {}", strerror(error.code()));
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return 127;
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}
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} else {
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stderr_is_a_tty = tty_or_error.value();
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}
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if (stderr_is_a_tty) {
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auto dup_or_error = Core::System::dup2(STDOUT_FILENO, STDERR_FILENO);
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if (dup_or_error.is_error()) {
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auto error = dup_or_error.release_error();
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if (error.code() != EBADF) {
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warnln("nohup: error redirecting stderr to stdout: {}", strerror(error.code()));
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return 127;
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}
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// NOTE: Standard output must be closed, so "...the same output shall
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// instead be appended to the end of the nohup.out file..."
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dup_out_file(STDERR_FILENO);
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}
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}
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TRY(Core::System::signal(SIGHUP, SIG_IGN));
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TRY(args.try_prepend(utility));
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auto exec_or_error = Core::System::exec(utility, args.span(), Core::System::SearchInPath::Yes);
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if (exec_or_error.is_error()) {
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auto error = exec_or_error.release_error();
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warnln("nohup: error while calling exec: {}", strerror(error.code()));
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return error.code() == ENOENT ? 127 : 126;
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}
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return 0;
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}
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