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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)
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13 changed files with 240 additions and 30 deletions
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#include <LibC/stdio.h>
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#include <LibC/unistd.h>
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#include <LibC/errno.h>
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#include <LibC/string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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int main(int argc, char** argv)
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{
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