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pkill: Add -n option to kill the newest matching process only

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Tim Ledbetter 2023-06-15 18:25:05 +01:00 committed by Andreas Kling
parent 0621a83cb4
commit 519893d31f
2 changed files with 17 additions and 7 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] [--signal signame] [--uid uid-list] [--exact] <process-name>
$ pkill [--count] [--ignore-case] [--echo] [--newest] [--signal signame] [--uid uid-list] [--exact] <process-name>
```
## Options
@ -13,6 +13,7 @@ $ pkill [--count] [--ignore-case] [--echo] [--signal signame] [--uid uid-list] [
* `-c`, `--count`: Display the number of matching processes
* `-i`, `--ignore-case`: Make matches case-insensitive
* `-e`, `--echo`: Display what is killed
* `-n`, `--newest`: Kill the most recently created process only
* `-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

@ -6,6 +6,7 @@
*/
#include <AK/Format.h>
#include <AK/QuickSort.h>
#include <AK/Vector.h>
#include <LibCore/Account.h>
#include <LibCore/ArgsParser.h>
@ -29,6 +30,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
bool case_insensitive = false;
bool echo = false;
bool exact_match = false;
bool newest_only = false;
StringView pattern;
HashTable<uid_t> uids_to_filter_by;
int signal = SIGTERM;
@ -37,6 +39,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
args_parser.add_option(display_number_of_matches, "Display the number of matching processes", "count", 'c');
args_parser.add_option(case_insensitive, "Make matches case-insensitive", "ignore-case", 'i');
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(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Signal number to send. A signal name or number may be used",
@ -115,12 +118,18 @@ ErrorOr<int> serenity_main(Main::Arguments args)
}
}
for (auto& process : matched_processes) {
auto result = Core::System::kill(process.pid, signal);
if (result.is_error())
warnln("Killing pid {} failed. {}", process.pid, result.release_error());
else if (echo)
outln("{} killed (pid {})", process.name, process.pid);
if (!matched_processes.is_empty()) {
quick_sort(matched_processes, [](auto const& a, auto const& b) { return a.creation_time < b.creation_time; });
if (newest_only)
matched_processes = { matched_processes.last() };
for (auto& process : matched_processes) {
auto result = Core::System::kill(process.pid, signal);
if (result.is_error())
warnln("Killing pid {} failed. {}", process.pid, result.release_error());
else if (echo)
outln("{} killed (pid {})", process.name, process.pid);
}
}
if (display_number_of_matches)