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  1. #include <iostream>
  2.  
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <time.h>
  6. #include <signal.h>
  7. #include <errno.h>
  8. #include <assert.h>
  9.  
  10. #include <unistd.h>
  11. #include <sys/time.h>
  12. #include <sys/select.h>
  13.  
  14. extern "C" {
  15.     static int xsignal (int sig, void (*handler)(int))
  16.     {
  17.         struct sigaction sa;
  18.         sa.sa_handler = handler;
  19.         sigemptyset(&sa.sa_mask);
  20.         sa.sa_flags = 0;
  21.         return sigaction(sig, &sa, NULL);
  22.     }
  23.  
  24.     void sigalarm_handler (int) {}
  25. }
  26.  
  27. int main ()
  28. {
  29.     if (xsignal(SIGALRM, sigalarm_handler) != 0) {
  30.         perror("sigaction");
  31.         exit(EXIT_FAILURE);
  32.     }
  33.  
  34.     struct itimerval it = { { 0, 200000 }, { 0, 150000 } };
  35.     if (setitimer(ITIMER_REAL, &it, 0) != 0) {
  36.         perror("setitimer");
  37.         exit(EXIT_FAILURE);
  38.     }
  39.  
  40.     struct timeval tv;
  41.     for (int i = 0; i < 10; ++i) {
  42.         ssize_t select_result = select(0, 0, 0, 0, 0);
  43.         assert(select_result < 0 && errno == EINTR);
  44.         // get a sample
  45.         //...
  46.         gettimeofday(&tv, 0);
  47.         std::cerr << tv.tv_usec/1000 << std::endl;
  48.     }
  49. }
  50.  
Success #stdin #stdout 0s 2892KB
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https://ideone.com/7XZZnn
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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