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Add some basic signal support.

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

View file

@ -56,6 +56,7 @@ enum Function {
Getdtablesize = 0x2024,
Dup = 0x2025,
Dup2 = 0x2026,
Sigaction = 0x2027,
};
void initialize();