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1
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#include <stdio.h>
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2
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#include <stdlib.h>
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3
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#include <signal.h>
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4
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#include <string.h>
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5
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#include <unistd.h>
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6
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#include <fcntl.h>
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7
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#include <time.h>
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8
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#include <errno.h>
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9
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#include <sys/ptrace.h>
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10
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#include <sys/types.h>
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11
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#include <sys/stat.h>
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12
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#include <sys/wait.h>
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13
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14
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pid_t signal_pid;
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15
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16
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17
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void signal_handler(int signum, siginfo_t *info, void *ctx){
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18
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ptrace(PTRACE_DETACH,signal_pid,NULL,NULL);
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19
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exit(EXIT_SUCCESS);
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20
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}
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21
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22
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int main( int argc ,char *argv[] )
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23
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{
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pid_t pid;
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int status;
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26
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struct timespec interval;
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27
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struct sigaction signal;
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28
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29
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30
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31
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if( argc < 3 ){
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32
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printf("Usage:\n");
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33
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printf(" # %s pid interval(nanosec)\n\n",argv[0]);
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34
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exit(1);
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35
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}
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36
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pid = atoi(argv[1]);
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37
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interval.tv_sec = 0;
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38
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interval.tv_nsec = atol(argv[2]);
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39
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if( interval.tv_nsec == 0 ){
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40
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printf("Usage:\n");
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41
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printf(" # %s pid interval(nanosec)\n\n",argv[0]);
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42
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exit(1);
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43
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}
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44
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45
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46
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memcpy(&signal_pid,&pid,sizeof(pid_t));
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47
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memset(&signal,0x00,sizeof(sigaction));
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48
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signal.sa_sigaction = signal_handler;
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49
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signal.sa_flags = SA_RESTART | SA_SIGINFO;
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50
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51
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if (sigaction(SIGINT, &signal, NULL) < 0) {
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52
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fprintf(stderr,"Failed to sigaction\n");
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53
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exit(2);
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54
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}
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55
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56
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57
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if(ptrace(PTRACE_ATTACH,pid,NULL,NULL) != 0 ){
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58
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fprintf(stderr,"Failed to attach (pid: %d)\n",pid);
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59
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exit(1);
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60
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}
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61
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62
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printf("Now to be slowing... If you will stop for slow, press Ctrl + c\n");
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63
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while(1){
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64
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if(waitpid(pid,&status,0) < 0 ){
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65
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fprintf(stderr,"Failed to waitpid (pid: %d) %s\n",pid,strerror(errno));
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66
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exit(1);
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67
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}
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68
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if(WIFEXITED(status))break;
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69
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if(ptrace(PTRACE_SINGLESTEP,pid,0,NULL) != 0 ){
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70
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fprintf(stderr,"Failed to single step (pid: %d) %s\n",pid,strerror(errno));
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71
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exit(1);
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72
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}
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73
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nanosleep(&interval,NULL);
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74
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}
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75
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76
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ptrace(PTRACE_DETACH,pid,NULL,NULL);
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77
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return EXIT_SUCCESS;
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78
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}
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