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)

1 files changed, 3 insertions, 3 deletions

diff --git a/LibC/stdlib.h b/LibC/stdlib.h
index 0a6102719a..0cd6a8e2c8 100644
--- a/LibC/stdlib.h
+++ b/LibC/stdlib.h
@@ -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