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7e77a2ec40
As threads come and go, we can't simply account for how many time slices the threads at any given point may have been using. We need to also account for threads that have since disappeared. This means we also need to track how many time slices we have expired globally. However, because this doesn't account for context switches outside of the system timer tick values may still be under-reported. To solve this we will need to track more accurate time information on each context switch. This also fixes top's cpu usage calculation which was still based on the number of context switches. Fixes #6473
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/ProcessStatisticsReader.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static int pid_of(const String& process_name, bool single_shot, bool omit_pid, pid_t pid)
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{
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bool displayed_at_least_one = false;
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auto all_processes = Core::ProcessStatisticsReader::get_all();
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if (!all_processes.has_value())
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return 1;
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for (auto& it : all_processes.value().processes) {
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if (it.name == process_name) {
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if (!omit_pid || it.pid != pid) {
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out(displayed_at_least_one ? " {}" : "{}", it.pid);
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displayed_at_least_one = true;
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if (single_shot)
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break;
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}
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}
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}
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if (displayed_at_least_one)
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outln();
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return 0;
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}
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int main(int argc, char** argv)
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{
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bool single_shot = false;
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const char* omit_pid_value = nullptr;
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const char* process_name = nullptr;
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Core::ArgsParser args_parser;
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args_parser.add_option(single_shot, "Only return one pid", nullptr, 's');
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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");
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args_parser.add_positional_argument(process_name, "Process name to search for", "process-name");
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args_parser.parse(argc, argv);
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pid_t pid_to_omit = 0;
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if (omit_pid_value) {
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if (!strcmp(omit_pid_value, "%PPID")) {
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pid_to_omit = getppid();
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} else {
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auto number = StringView(omit_pid_value).to_uint();
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if (!number.has_value()) {
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warnln("Invalid value for -o");
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args_parser.print_usage(stderr, argv[0]);
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return 1;
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}
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pid_to_omit = number.value();
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}
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}
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return pid_of(process_name, single_shot, omit_pid_value != nullptr, pid_to_omit);
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}
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