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