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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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45
VirtualFileSystem/UnixTypes.h
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@ -20,9 +20,54 @@ typedef dword nlink_t;
typedef dword uid_t;
typedef dword gid_t;
#ifdef SERENITY
typedef void (*__sighandler_t)(int);
typedef __sighandler_t sighandler_t;
typedef dword sigset_t;
typedef void siginfo_t;
struct sigaction {
union {
void (*sa_handler)(int);
void (*sa_sigaction)(int, siginfo_t*, void*);
};
sigset_t sa_mask;
int sa_flags;
void (*sa_restorer)(void);
};
#define SA_NOCLDSTOP 1
#define SA_NOCLDWAIT 2
#define SA_SIGINFO 4
#define SIG_BLOCK 0
#define SIG_UNBLOCK 1
#define SIG_SETMASK 2
#define SIGHUP 1
#define SIGINT 2
#define SIGQUIT 3
#define SIGILL 4
#define SIGTRAP 5
#define SIGABRT 6
#define SIGBUS 7
#define SIGFPE 8
#define SIGKILL 9
#define SIGUSR1 10
#define SIGSEGV 11
#define SIGUSR2 12
#define SIGPIPE 13
#define SIGALRM 14
#define SIGTERM 15
#define SIGCONT 18
#define SIGTSTP 20
#define SIGTTIN 21
#define SIGTTOU 22
#endif
#ifdef SERENITY
// FIXME: Support 64-bit offsets!
typedef signed_dword off_t;