cdev/test.c

   1 #include <fcntl.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/mydev.h>
   7 #include <prop/proplib.h>
   8
   9 int main()
  10 {
  11     struct mydev_params params;
  12     prop_dictionary_t pd;
  13     prop_string_t ps;
  14     int devfd;
  15
  16     params.number = 42;
  17     strcpy(params.string, "Hello World");
  18
  19     /* Open device */
  20     if ((devfd = open("/dev/mydev", O_RDONLY, 0)) < 0) {
  21         fprintf(stderr, "Failed to open /dev/mydev\n");
  22         exit(EXIT_FAILURE);
  23     }
  24
  25     /* Send ioctl request in the traditional way */
  26     if (ioctl(devfd, MYDEVTEST, &params) < 0) {
  27         close(devfd);
  28         err("ioctl()");
  29     }
  30
  31     /* Create dictionary and add a <key, value> pair in it */
  32     pd = prop_dictionary_create();
  33     if (pd == NULL) {
  34         close(devfd);
  35         err("prop_dictionary_create()");
  36     }
  37
  38     ps = prop_string_create_cstring("key");
  39     if (ps == NULL) {
  40         close(devfd);
  41         prop_object_release(pd);
  42         err("prop_string_create_cstring()");
  43     }
  44
  45     if (prop_dictionary_set(pd, "value", ps) == false) {
  46         close(devfd);
  47         prop_object_release(ps);
  48         prop_object_release(pd);
  49         err("prop_dictionary_set()");
  50     }
  51
  52     prop_object_release(ps);
  53
  54     /* Send dictionary to kernel space */
  55     prop_dictionary_send_ioctl(pd, devfd, MYDEVSETPROPS);
  56
  57     prop_object_release(pd);
  58
  59     close(devfd);
  60
  61     return EXIT_SUCCESS;
  62 }