cauchy/ptrace/ptrace_open_i686.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <sys/ptrace.h>
   4 #include <sys/wait.h>
   5
   6 #define die(msg) { perror(msg); exit(EXIT_FAILURE); }
   7
   8 int
   9 main(int argc, char *argv[])
  10 {
  11     int pid, c, rc, status;
  12     struct timeval tv, tv2;
  13
  14     if (argc <= 1) {
  15         printf("no enough args\n");
  16         exit(EXIT_FAILURE);
  17     }
  18
  19     pid = fork();
  20     if (pid == -1) {
  21         die("fork");
  22     } else if (pid == 0) {
  23         if (ptrace(PTRACE_TRACEME, 0, (char *) 1, 0) == -1) die("trace me");
  24         if (kill(getpid(), SIGSTOP) == -1) die("stop");
  25         if(argc == 2) {
  26             execvp(argv[1], NULL);
  27         } else {
  28             execvp(argv[1], &argv[2]);
  29         }
  30         die("execvp");
  31     }
  32
  33     c = 0;
  34     while(1) {
  35         c++;
  36         gettimeofday(&tv, NULL);
  37         rc = ptrace(PTRACE_SYSCALL, pid, (char *) 1, 0);
  38         if (rc == -1) die("trace syscall");
  39
  40         /* 0x57F */
  41         rc = waitpid(pid, &status, 0);
  42         if (rc == -1) die("waitpid");
  43
  44         gettimeofday(&tv2, NULL);
  45
  46         if (WIFEXITED(status)) break;
  47
  48         fprintf(stderr, "%03d: %07.5lf\n", c, (tv2.tv_sec - tv.tv_sec) + (tv2.tv_usec - tv.tv_usec) / 1E6);
  49     }
  50
  51     return EXIT_SUCCESS;
  52 }