/g/ - syscall of the day: kill/tkill/tgkill - Technology

Anonymous

syscall of the day: kill/tkill(...) 02/26/26(Thu)10:07:34 No.108244624

File: 1715336431552843.png (2.08 MB, 1244x5223)

syscall of the day: kill/tkill/tgkill Anonymous 02/26/26(Thu)10:07:34 No.108244624 Archived

previous: >>108236633
#define __NR_kill                62
#define __NR_tkill                    200
#define __NR_tgkill                    234
https://man7.org/linux/man-pages/man2/kill.2.html
https://man7.org/linux/man-pages/man2/tkill.2.html

tl;dr:
signal processes, or specific threads within processes

this aspect is pretty neat. it's a useful trick that not everyone knows about
>If sig is 0, then no signal is sent, but existence and permission checks are still performed; this can be used to check for the existence of a process ID or process group ID that the caller is permitted to signal.
other than that, though, it's breddy simple. not much to say about it. i guess it's convenient to be able to
raise(SIGSTOP)
and perform a bit of process introspection without having to bust out gdb. so, if you haven't tried that before, i recommend it

relevant resources:
man man
man syscalls
https://man7.org/linux/man-pages/
https://linux.die.net/man/
https://elixir.bootlin.com/linux/
https://elixir.bootlin.com/musl/
https://elixir.bootlin.com/glibc/

Anonymous
02/26/26(Thu)11:11:30 No.108245007

Anonymous 02/26/26(Thu)11:11:30 No.108245007

not much interest recently, huh...

Anonymous
02/26/26(Thu)11:17:21 No.108245049

Anonymous 02/26/26(Thu)11:17:21 No.108245049

>>108245007
don't worry syscall anon i like lurking your threads even if nobody else comes

Anonymous
02/26/26(Thu)14:09:31 No.108246220

Anonymous 02/26/26(Thu)14:09:31 No.108246220

>>108244624
>kill/tkill/tgkill
And which one has the slobber option?

Anonymous
02/26/26(Thu)17:27:51 No.108247518

Anonymous 02/26/26(Thu)17:27:51 No.108247518

>>108244624
huh, I did indeed not know about the kill(0) variant

Anonymous
02/26/26(Thu)21:41:02 No.108249166

Anonymous 02/26/26(Thu)21:41:02 No.108249166

>>108245049
you should bump them for me then ;___;
>>108246220
huh?
>>108247518
yeah! it's really handy

Anonymous
02/27/26(Fri)01:16:55 No.108250252

Anonymous 02/27/26(Fri)01:16:55 No.108250252

>>108245007
I'm very interested and I read each thread but I almost never have anything useful to add.

Anonymous
02/27/26(Fri)07:57:31 No.108252088

Anonymous 02/27/26(Fri)07:57:31 No.108252088

>If pid equals -1, then sig is sent to every process for which the calling process has permission to send signals, except for process 1 (init), but see below.
I dare somebody to run
kill(-1, 9)
as root.

Anonymous
02/27/26(Fri)08:18:48 No.108252204

Anonymous 02/27/26(Fri)08:18:48 No.108252204

>>108252088
it just crashes your machine

Anonymous
02/27/26(Fri)08:20:43 No.108252217

Anonymous 02/27/26(Fri)08:20:43 No.108252217

>>108250252
you can help by bumping!

Anonymous
02/27/26(Fri)08:35:47 No.108252295

Anonymous 02/27/26(Fri)08:35:47 No.108252295

>>108244624
I like your threads, anon. I'm sorry I never come here and never post, but it's way above my two brain cells. I weep for the day you'll finish covering all of syscalls.

This world will be a sadder place when you're gone, and I mean it, anon.

Anonymous
02/27/26(Fri)08:41:01 No.108252318

Anonymous 02/27/26(Fri)08:41:01 No.108252318

>>108245049
Same.

Anonymous
02/27/26(Fri)08:42:02 No.108252325

Anonymous 02/27/26(Fri)08:42:02 No.108252325

File: 1689040282692546.png (16 KB, 272x225)

16 KB PNG

>>108244624
>tgkill

Anonymous
02/27/26(Fri)08:43:22 No.108252333

Anonymous 02/27/26(Fri)08:43:22 No.108252333

File: 1769956682984757.jpg (44 KB, 460x460)

44 KB JPG

>>108252325
lol i think about that every time i use it
there are lots of other funny collisions like that for those of us who are brainrotted enough

Anonymous
02/27/26(Fri)11:31:57 No.108253442

Anonymous 02/27/26(Fri)11:31:57 No.108253442

>>108252295
True, syscall anon is one of the few real people on here, and I really like syscalls as a thread idea, but I don't know what to contribute. Maybe OP should give us a hint what he expects from his threads, because often times I come here, and have no clue what to write about, other than the fact that I know the syscall and might have used it somewhere...

Anonymous
02/27/26(Fri)13:36:54 No.108254312

Anonymous 02/27/26(Fri)13:36:54 No.108254312

:^) bumperino