Implement basic sys$kill() and add a /bin/kill

All it can do right now is send SIGKILL which just murders the target task.

LibC/Makefile

@@ -16,6 +16,7 @@ LIBC_OBJS = \
        time.o \
        utsname.o \
        assert.o \
+       signal.o \
        entry.o
 
 OBJS = $(AK_OBJS) $(LIBC_OBJS)

LibC/signal.cpp

@@ -0,0 +1,14 @@
+#include "unistd.h"
+#include "errno.h"
+#include <Kernel/Syscall.h>
+
+extern "C" {
+
+int kill(pid_t pid, int sig)
+{
+    int rc = Syscall::invoke(Syscall::PosixKill, (dword)pid, (dword)sig);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+}
+

LibC/signal.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "types.h"
+
+extern "C" {
+
+int kill(pid_t, int sig);
+
+#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
+
+}
+