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597ff9ec93
The kill system call accepts negative pids, as they
have special meaning:
pid == -1 means all processes the calling process has access to.
pid < -1 means every process who's process group ID is -pid.
I don't see any reason why the user space program should mask this.
71 lines
2.3 KiB
C++
71 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 <AK/String.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static void print_usage_and_exit()
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{
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printf("usage: kill [-signal] <PID>\n");
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exit(1);
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}
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int main(int argc, char** argv)
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{
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if (pledge("stdio proc", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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if (argc != 2 && argc != 3)
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print_usage_and_exit();
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bool ok;
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unsigned signum = SIGTERM;
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int pid_argi = 1;
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if (argc == 3) {
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pid_argi = 2;
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if (argv[1][0] != '-')
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print_usage_and_exit();
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signum = String(&argv[1][1]).to_uint(ok);
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if (!ok) {
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printf("'%s' is not a valid signal number\n", &argv[1][1]);
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return 2;
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}
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}
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pid_t pid = String(argv[pid_argi]).to_int(ok);
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if (!ok) {
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printf("'%s' is not a valid PID\n", argv[pid_argi]);
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return 3;
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}
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int rc = kill(pid, signum);
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if (rc < 0)
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perror("kill");
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return 0;
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}
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