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pkill: Add -O option to filter processes by age

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This option allows the user to specify a number of seconds. Only
processes older than the given number of seconds are killed.
This commit is contained in:
Tim Ledbetter 2023-06-15 18:25:11 +01:00 committed by Andreas Kling
parent aa79a4ed9a
commit 17fe2c4822
Notes: sideshowbarker 2024-07-17 05:21:12 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/17fe2c4822
Pull-request: https://github.com/SerenityOS/serenity/pull/19407
2 changed files with 23 additions and 1 deletions
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3
Base/usr/share/man/man1/pkill.md
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@ -5,7 +5,7 @@ pkill - Signal processes based on name
## Synopsis
```sh
$ pkill [--count] [--ignore-case] [--echo] [--newest] [--oldest] [--signal signame] [--uid uid-list] [--exact] <process-name>
$ pkill [--count] [--ignore-case] [--echo] [--newest] [--oldest] [--older seconds] [--signal signame] [--uid uid-list] [--exact] <process-name>
```
## Options
@ -15,6 +15,7 @@ $ pkill [--count] [--ignore-case] [--echo] [--newest] [--oldest] [--signal signa
* `-e`, `--echo`: Display what is killed
* `-n`, `--newest`: Kill the most recently created process only
* `-o`, `--oldest`: Select the least recently created process only
* `-O`, `--older`: Select only processes older than the specified number of seconds
* `-s signame`, `--signal signame`: Signal to send. The signal name or number may be used
* `-U uid-list`, `--uid uid-list`: Select only processes whose UID is in the given comma-separated list. Login name or numerical user ID may be used
* `-x`, `--exact`: Select only processes whose names match the given pattern exactly

21
Userland/Utilities/pkill.cpp
View file

@ -32,6 +32,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
bool exact_match = false;
bool newest_only = false;
bool oldest_only = false;
Optional<UnixDateTime> display_if_older_than;
StringView pattern;
HashTable<uid_t> uids_to_filter_by;
int signal = SIGTERM;
@ -42,6 +43,23 @@ ErrorOr<int> serenity_main(Main::Arguments args)
args_parser.add_option(echo, "Display what is killed", "echo", 'e');
args_parser.add_option(newest_only, "Kill the most recently created process only", "newest", 'n');
args_parser.add_option(oldest_only, "Kill the least recently created process only", "oldest", 'o');
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Kill only processes older than the specified number of seconds",
.long_name = "older",
.short_name = 'O',
.value_name = "seconds",
.accept_value = [&display_if_older_than](StringView seconds_string) {
auto number = seconds_string.to_uint<u64>();
if (number.has_value() && number.value() <= NumericLimits<i64>::max()) {
auto now_time = UnixDateTime::now();
display_if_older_than = now_time - Duration::from_seconds(static_cast<i64>(number.value()));
}
return display_if_older_than.has_value();
},
});
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Signal number to send. A signal name or number may be used",
@ -122,6 +140,9 @@ ErrorOr<int> serenity_main(Main::Arguments args)
if (!uids_to_filter_by.is_empty() && !uids_to_filter_by.contains(process.uid))
continue;
if (display_if_older_than.has_value() && process.creation_time >= display_if_older_than.value())
continue;
matched_processes.append(process);
}
}