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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/String.h>
28#include <signal.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <unistd.h>
32
33static void print_usage_and_exit()
34{
35 printf("usage: kill [-signal] <PID>\n");
36 exit(1);
37}
38
39int main(int argc, char** argv)
40{
41 if (pledge("stdio proc", nullptr) < 0) {
42 perror("pledge");
43 return 1;
44 }
45
46 if (argc != 2 && argc != 3)
47 print_usage_and_exit();
48 bool ok;
49 unsigned signum = SIGTERM;
50 int pid_argi = 1;
51 if (argc == 3) {
52 pid_argi = 2;
53 if (argv[1][0] != '-')
54 print_usage_and_exit();
55 signum = String(&argv[1][1]).to_uint(ok);
56 if (!ok) {
57 printf("'%s' is not a valid signal number\n", &argv[1][1]);
58 return 2;
59 }
60 }
61 unsigned pid = String(argv[pid_argi]).to_uint(ok);
62 if (!ok) {
63 printf("'%s' is not a valid PID\n", argv[pid_argi]);
64 return 3;
65 }
66
67 int rc = kill((pid_t)pid, signum);
68 if (rc < 0)
69 perror("kill");
70 return 0;
71}