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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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6
LibC/stdlib.h
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@ -5,15 +5,15 @@
__BEGIN_DECLS
void* malloc(size_t);
void* malloc(size_t) __MALLOC;
void free(void*);
void* calloc(size_t nmemb, size_t);
void* realloc(void *ptr, size_t);
char* getenv(const char* name);
int atoi(const char*);
void exit(int status);
void abort();
void exit(int status) __NORETURN;
void abort() __NORETURN;
__END_DECLS