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039e529dbe
It has been possible for a signal to arrive in between us checking g_interrupted and exiting - sucessfully, even though we were interrupted. This way, if a signal arrives before we reset the disposition, we will reliably check for it later; if it arrives afterwards, it'll kill us automatically.
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCore/ArgsParser.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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static volatile bool g_interrupted;
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static void handle_sigint(int)
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{
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g_interrupted = true;
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}
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int main(int argc, char** argv)
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{
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int secs;
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Core::ArgsParser args_parser;
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args_parser.add_positional_argument(secs, "Number of seconds to sleep for", "num-seconds");
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args_parser.parse(argc, argv);
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struct sigaction sa;
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memset(&sa, 0, sizeof(struct sigaction));
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sa.sa_handler = handle_sigint;
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sigaction(SIGINT, &sa, nullptr);
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if (pledge("stdio sigaction", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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unsigned remaining = sleep(secs);
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if (remaining) {
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printf("Sleep interrupted with %u seconds remaining.\n", remaining);
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}
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signal(SIGINT, SIG_DFL);
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if (g_interrupted)
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raise(SIGINT);
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return 0;
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}
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