static void handle_trap()

in os-Linux/skas/process.c [184:224]

• 36 lines of code
• 10 McCabe index (conditional complexity)

static void handle_trap(int pid, struct uml_pt_regs *regs,
			int local_using_sysemu)
{
	int err, status;

	if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
		fatal_sigsegv();

	if (!local_using_sysemu)
	{
		err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
			     __NR_getpid);
		if (err < 0) {
			printk(UM_KERN_ERR "handle_trap - nullifying syscall "
			       "failed, errno = %d\n", errno);
			fatal_sigsegv();
		}

		err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
		if (err < 0) {
			printk(UM_KERN_ERR "handle_trap - continuing to end of "
			       "syscall failed, errno = %d\n", errno);
			fatal_sigsegv();
		}

		CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
		if ((err < 0) || !WIFSTOPPED(status) ||
		    (WSTOPSIG(status) != SIGTRAP + 0x80)) {
			err = ptrace_dump_regs(pid);
			if (err)
				printk(UM_KERN_ERR "Failed to get registers "
				       "from process, errno = %d\n", -err);
			printk(UM_KERN_ERR "handle_trap - failed to wait at "
			       "end of syscall, errno = %d, status = %d\n",
			       errno, status);
			fatal_sigsegv();
		}
	}

	handle_syscall(regs);
}