test/test54.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <fcntl.h>
   5 #include <string.h>
   6 #include <err.h>
   7 #include <stdlib.h>
   8
   9 #define MAX_ERROR 3
  10 #include "common.c"
  11
  12 int subtest = -1;
  13
  14 void do_test(void)
  15 {
  16         int fd;
  17         char *wbuf, *rbuf;
  18         off_t off=0;
  19         size_t size;
  20         ssize_t nwritten;
  21         ssize_t nread;
  22         char *filename = "pwrite_test_XXXXXXX";
  23         int i;
  24
  25         subtest = 1;
  26
  27         if ((fd = mkstemp(filename)) < 0) e(1);
  28
  29         size = 1 + rand() % 4096;
  30         off = rand();
  31
  32         if((wbuf = malloc(sizeof(char)*size)) == NULL) e(2);
  33
  34         for(i = 0; i < size; i++) {
  35                 wbuf[i] = 1 + rand()%127;
  36         }
  37
  38         if ((nwritten = pwrite(fd, wbuf, size, off)) < 0) e(3);
  39         if ((rbuf = malloc(sizeof(char)*nwritten)) == NULL) e(4);
  40         if ((nread = pread(fd, rbuf, nwritten, off)) < 0) e(5);
  41         if (strncmp(rbuf, wbuf, nread) != 0) e(6);
  42
  43         close(fd);
  44         free(wbuf);
  45         unlink(filename);
  46 }
  47
  48
  49 int main(void)
  50 {
  51         start(54);
  52         do_test();
  53         quit();
  54         return(-1);     /* Unreachable */
  55 }