syscalls: start adding exit syscall, not done yet

src/tasking/syscalls.c

@@ -46,6 +46,14 @@ const char* flags_to_mode_str(int flags) {
     return mode;
 }
 
+int sys_exit(TrapFrame *tf)
+{
+    int error_code = tf->ebx;
+
+    task_kill(current);
+    return error_code;
+}
+
 int sys_read(TrapFrame *tf)
 {
     if(tf->ebx < 3)
@@ -72,7 +80,7 @@ int sys_write(TrapFrame *tf)
             debug_log("\n=================SYS_WRITE output to stdout=====================\n");
             print((char*)tf->ecx, tf->edx);
             debug_log("\n=================END OF THAT SHIT=====================\n");
-            tf->ecx++;
+            return tf->edx;
         }
     }
     else
@@ -140,6 +148,12 @@ void handle_syscall(TrapFrame *tf)
     debug_log("EBX: %X ", tf->ebx);
     debug_log("ECX: %s ", tf->ecx);
     debug_log("EDX: %X\n", tf->edx);
+
+    if(tf->eax == 1)//exit
+    {
+        int r = sys_exit(tf);
+        tf->eax = r;
+    }
     
     if(tf->eax == 3)//read
     {