fileops/readwd.c

   1 /*
   2  * WARNING: I got spontaneous hangups with the following code in NetBSD 4.99.20
   3  *
   4  * Compile with:
   5  * gcc readwd.c -o readwd -Wall -W -Wextra -ansi -pedantic
   6  */
   7
   8 #include <fcntl.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <dev/ata/atareg.h>
  14 #include <sys/ataio.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/param.h>
  17
  18 int main(int argc, char *argv[])
  19 {
  20     int fd;
  21     unsigned int i;
  22     struct atareq req;
  23     union {
  24         unsigned char inbuf[DEV_BSIZE];
  25         struct ataparams inqbuf;
  26     } inbuf;
  27     u_int16_t *p;
  28
  29     /* Check argument count */
  30     if (argc != 2) {
  31         fprintf(stderr, "usage: %s /dev/file\n", argv[0]);
  32         exit(EXIT_FAILURE);
  33     }
  34
  35     /* Open device file descriptor */
  36     if ((fd = open(argv[1], O_RDONLY)) == -1) {
  37         perror("open");
  38         exit(EXIT_FAILURE);
  39     }
  40
  41     /* Construct an ata request */
  42     memset(&req, 0, sizeof req);
  43     req.flags = ATACMD_READ;
  44     req.command = WDCC_IDENTIFY;
  45     req.databuf = (caddr_t) &inbuf;
  46     req.datalen = sizeof inbuf;
  47     req.timeout = 1000;    /* 1 sec */
  48
  49     /* Make the ioctl call */
  50     if (ioctl(fd, ATAIOCCOMMAND, &req) == -1) {
  51         perror("ioctl");
  52         exit(EXIT_FAILURE);
  53     }
  54
  55     /* Handle ata request return status */
  56     switch (req.retsts) {
  57     case ATACMD_OK:
  58         break;
  59     case ATACMD_TIMEOUT:
  60         fprintf(stderr, "ata request timed out\n");
  61         exit(EXIT_FAILURE);
  62     case ATACMD_DF:
  63         fprintf(stderr, "ata device returned a device fault\n");
  64         exit(EXIT_FAILURE);
  65     case ATACMD_ERROR:
  66         fprintf(stderr, "ata device returned error code: %0x\n", req.error);
  67         exit(EXIT_FAILURE);
  68     default:
  69         fprintf(stderr, "unknown ata request return status: %d\n", req.retsts);
  70         exit(EXIT_FAILURE);
  71     }
  72
  73     /*
  74      * Magic for little endian archs
  75      * FIXME: add #ifdef condition for little endian archs
  76      */
  77     for (i = 0; i < sizeof inbuf.inqbuf.atap_model; i+=2) {
  78         p = (u_int16_t *) (inbuf.inqbuf.atap_model + i);
  79         *p = ntohs(*p);
  80     }
  81
  82     /* Print the model (trim spaces when printing) */
  83     for (i = 0; i < sizeof inbuf.inqbuf.atap_model; i++)
  84         if (inbuf.inqbuf.atap_model[i] != ' ')
  85             printf("%c", inbuf.inqbuf.atap_model[i]);
  86     printf("\n");
  87
  88     /* Close file descriptor */
  89     close(fd);
  90
  91     return EXIT_SUCCESS;
  92 }