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 <LibCore/ArgsParser.h>
9#include <LibCore/ProcessStatisticsReader.h>
10#include <LibCore/System.h>
11#include <LibMain/Main.h>
12#include <stdio.h>
13#include <string.h>
14#include <unistd.h>
15
16static ErrorOr<int> pid_of(DeprecatedString const& process_name, bool single_shot, bool omit_pid, pid_t pid)
17{
18 bool displayed_at_least_one = false;
19
20 auto all_processes = TRY(Core::ProcessStatisticsReader::get_all());
21
22 for (auto& it : all_processes.processes) {
23 if (it.name == process_name) {
24 if (!omit_pid || it.pid != pid) {
25 out(displayed_at_least_one ? " {}"sv : "{}"sv, it.pid);
26 displayed_at_least_one = true;
27
28 if (single_shot)
29 break;
30 }
31 }
32 }
33
34 if (displayed_at_least_one)
35 outln();
36
37 return 0;
38}
39
40ErrorOr<int> serenity_main(Main::Arguments args)
41{
42 TRY(Core::System::pledge("stdio rpath"));
43 TRY(Core::System::unveil("/sys/kernel/processes", "r"));
44 TRY(Core::System::unveil("/etc/passwd", "r"));
45 TRY(Core::System::unveil(nullptr, nullptr));
46
47 bool single_shot = false;
48 StringView omit_pid_value;
49 StringView process_name;
50
51 Core::ArgsParser args_parser;
52 args_parser.add_option(single_shot, "Only return one pid", nullptr, 's');
53 args_parser.add_option(omit_pid_value, "Omit the given PID, or the parent process if the special value %PPID is passed", nullptr, 'o', "pid");
54 args_parser.add_positional_argument(process_name, "Process name to search for", "process-name");
55
56 args_parser.parse(args);
57
58 pid_t pid_to_omit = 0;
59 if (!omit_pid_value.is_empty()) {
60 if (omit_pid_value == "%PPID"sv) {
61 pid_to_omit = getppid();
62 } else {
63 auto number = omit_pid_value.to_uint();
64 if (!number.has_value()) {
65 warnln("Invalid value for -o");
66 args_parser.print_usage(stderr, args.strings[0]);
67 return 1;
68 }
69 pid_to_omit = number.value();
70 }
71 }
72 return pid_of(process_name, single_shot, !omit_pid_value.is_empty(), pid_to_omit);
73}