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153ea704af
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)
32 lines
768 B
C++
32 lines
768 B
C++
#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <Kernel/Syscall.h>
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extern "C" {
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int kill(pid_t pid, int sig)
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{
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int rc = Syscall::invoke(Syscall::PosixKill, (dword)pid, (dword)sig);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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sighandler_t signal(int signum, sighandler_t handler)
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{
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sighandler_t old_handler = (sighandler_t)Syscall::invoke(Syscall::PosixSignal, (dword)signum, (dword)handler);
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if (old_handler == SIG_ERR) {
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errno = EINVAL;
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return SIG_ERR;
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}
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errno = 0;
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return old_handler;
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}
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int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act)
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{
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int rc = Syscall::invoke(Syscall::Sigaction, (dword)signum, (dword)act, (dword)old_act);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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