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Add some basic signal support.

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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
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1
LibC/sys/cdefs.h
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@ -4,6 +4,7 @@
#define ALWAYS_INLINE inline __attribute__ ((always_inline))
#define __NORETURN __attribute__ ((noreturn))
#define __MALLOC __attribute__ ((malloc))
#ifdef __cplusplus
#define __BEGIN_DECLS extern "C" {