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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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@ -11,8 +11,10 @@ typedef uint32_t sigset_t;
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typedef void siginfo_t;
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struct sigaction {
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void (*sa_handler)(int);
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void (*sa_sigaction)(int, siginfo_t*, void*);
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union {
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void (*sa_handler)(int);
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void (*sa_sigaction)(int, siginfo_t*, void*);
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};
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sigset_t sa_mask;
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int sa_flags;
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void (*sa_restorer)(void);
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@ -20,11 +22,16 @@ struct sigaction {
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int kill(pid_t, int sig);
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sighandler_t signal(int sig, sighandler_t);
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int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act);
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#define SIG_DFL ((__sighandler_t)0)
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#define SIG_ERR ((__sighandler_t)-1)
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#define SIG_IGN ((__sighandler_t)1)
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#define SA_NOCLDSTOP 1
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#define SA_NOCLDWAIT 2
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#define SA_SIGINFO 4
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#define SIG_BLOCK 0
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#define SIG_UNBLOCK 1
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#define SIG_SETMASK 2
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