调试原理

void run_target(const char* programname)
{
​
​
    /* Allow tracing of this process */
    if (ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
        perror("ptrace");
        return;
    }
​
    /* Replace this process's image with the given program */
    execl(programname, programname, 0);
}
​
​
main:
​
child_pid = fork();
    if (child_pid == 0)
        run_target(argv[1]);
    else if (child_pid > 0)
        {
        wait(&wait_status);
        check_SIG(WIFSTOPPED(wait_status));
        do_debug(pid_t child_pid);
        }
    else {
        perror("fork");
        return -1;
        }