memcheck/tests/freebsd/eventfd1.c

   1 #include <sys/eventfd.h>
   2 #include <unistd.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 #define handle_error(msg) \
   7 do { \
   8 perror(msg); \
   9 exit(EXIT_FAILURE); \
  10 } while (0)
  11
  12 int
  13 main(int argc, char *argv[])
  14 {
  15    eventfd_t u;
  16    int efd, j;
  17    int error;
  18
  19    if (argc < 2) {
  20       fprintf(stderr, "Usage: %s <num>...\n", argv[0]);
  21       exit(EXIT_FAILURE);
  22    }
  23
  24    efd = eventfd(0, EFD_CLOEXEC);
  25    if (efd == -1)
  26       handle_error("eventfd");
  27
  28    switch (fork()) {
  29    case 0:
  30       for (j = 1; j < argc; j++) {
  31          printf("Child writing %s to efd\n", argv[j]);
  32          u = strtoull(argv[j], NULL, 0);
  33
  34          error = eventfd_write(efd, u);
  35          if (error != 0)
  36             handle_error("write");
  37       }
  38       printf("Child completed write loop\n");
  39
  40       exit(EXIT_SUCCESS);
  41
  42    default:
  43       sleep(2);
  44
  45       printf("Parent about to read\n");
  46       error = eventfd_read(efd, &u);
  47       if (error != 0)
  48          handle_error("read");
  49       printf("Parent read %llu (0x%llx) from efd\n",
  50              (unsigned long long) u, (unsigned long long) u);
  51       exit(EXIT_SUCCESS);
  52
  53    case -1:
  54
  55       handle_error("fork");
  56
  57    }
  58 }