jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/DeprecatedString.h>
8#include <AK/Optional.h>
9#include <LibCore/System.h>
10#include <LibMain/Main.h>
11#include <ctype.h>
12#include <signal.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16
17static void print_usage_and_exit()
18{
19 warnln("usage: kill [-signal] <PID>");
20 exit(1);
21}
22
23ErrorOr<int> serenity_main(Main::Arguments arguments)
24{
25
26 TRY(Core::System::pledge("stdio proc"));
27
28 int argc = arguments.argc;
29 auto strings = arguments.strings;
30
31 if (argc == 2 && strings[1] == "-l") {
32 for (size_t i = 0; i < NSIG; ++i) {
33 if (i && !(i % 5))
34 outln("");
35 out("{:2}) {:10}", i, getsignalname(i));
36 }
37 outln("");
38 return 0;
39 }
40
41 if (argc != 2 && argc != 3)
42 print_usage_and_exit();
43 unsigned signum = SIGTERM;
44 int pid_argi = 1;
45 if (argc == 3) {
46 pid_argi = 2;
47 if (strings[1][0] != '-')
48 print_usage_and_exit();
49
50 Optional<unsigned> number;
51
52 if (isalpha(strings[1][1])) {
53 int value = getsignalbyname(&strings[1][1]);
54 if (value >= 0 && value < NSIG)
55 number = value;
56 }
57
58 if (!number.has_value())
59 number = strings[1].substring_view(1, 1).to_uint();
60
61 if (!number.has_value()) {
62 warnln("'{}' is not a valid signal name or number", &strings[1][1]);
63 return 2;
64 }
65 signum = number.value();
66 }
67 auto pid_opt = strings[pid_argi].to_int();
68 if (!pid_opt.has_value()) {
69 warnln("'{}' is not a valid PID", strings[pid_argi]);
70 return 3;
71 }
72 pid_t pid = pid_opt.value();
73
74 int rc = kill(pid, signum);
75 if (rc < 0)
76 perror("kill");
77 return 0;
78}