#include <stdio.h>
#include <sys/ptrace.h>
#include <stdlib.h>
#include <sys/user.h>
#include <sys/types.h>
#include <sys/types.h>
#include <sys/wait.h>

int main(int argc, char **argv)
{
	pid_t traced_process = atoi(argv[1]);
	struct user_regs_struct regs;
	long ins;
	int entered = 0;
	int status;
	pid_t retcode;


	/* attach and stop process */
	ptrace(PTRACE_ATTACH, traced_process, NULL, NULL);

	/* Restarts the stopped child, but arranges for the child
	   to be stopped at the next entry call */
	ptrace(PTRACE_SYSCALL, traced_process, NULL, NULL);

	/* This process blocks until the child is stopped again */
	waitpid(traced_process, &status, __WALL);

	/* print status to standard out */
	printf("WIFSTOPPED(status) = %d\n", WIFSTOPPED(status));

	/* Copy the registers and print out regs.orig_rax */
	ptrace(PTRACE_GETREGS, traced_process, NULL, &regs);
	printf("interrupt with system call: %d\n\n", regs.orig_rax);
	printf(": %s\n\n", regs.rcx);

	/* Start the stopped child again and arrange for child
	   to be stopped at the next exit */
	ptrace(PTRACE_SYSCALL, traced_process, NULL, NULL);

	/* This process blocks until the child is stopped again */
	waitpid(traced_process, &status, __WALL);

	/* print status to standard out */
	printf("WIFSTOPPED(status) = %d\n", WIFSTOPPED(status));

	/* Copy the registers and print out regs.orig_rax */
	ptrace(PTRACE_GETREGS, traced_process, NULL, &regs);
	printf("interrupt with system call: %d\n\n", regs.orig_rax);

	return 0;
}