RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-24 22:17:42 +00:00
Code Issues Activity Actions

Add some basic signal support.

Browse source 
It only works for sending a signal to a process that's in userspace code.

We implement reception by synthesizing a PUSHA+PUSHF in the receiving process
(operating on values in the TSS.)
The TSS CS:EIP is then rerouted to the signal handler and a tiny return
trampoline is constructed in a dedicated region in the receiving process.

Also hacked up /bin/kill to be able to send arbitrary signals (kill -N PID)
This commit is contained in:
Andreas Kling 2018-11-06 10:46:40 +01:00
parent 52d502e11f
commit 153ea704af
13 changed files with 240 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

6
LibC/signal.cpp
View file

@ -22,5 +22,11 @@ sighandler_t signal(int signum, sighandler_t handler)
return old_handler;
}
int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act)
{
int rc = Syscall::invoke(Syscall::Sigaction, (dword)signum, (dword)act, (dword)old_act);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}