minix/tests/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 int max_error = 3;
  10 #include "common.h"
  11
  12
  13 int subtest = -1;
  14
  15 static void do_test(void)
  16 {
  17         int fd;
  18         char *wbuf, *rbuf;
  19         off_t off=0;
  20         size_t size;
  21         ssize_t nwritten;
  22         ssize_t nread;
  23         char filename[] = "pwrite_test_XXXXXXX";
  24         int i;
  25
  26         subtest = 1;
  27
  28         if ((fd = mkstemp(filename)) < 0) e(1);
  29
  30         size = 1 + rand() % 4096;
  31         off = rand();
  32
  33         if((wbuf = malloc(sizeof(char)*size)) == NULL) e(2);
  34
  35         for(i = 0; i < size; i++) {
  36                 wbuf[i] = 1 + rand()%127;
  37         }
  38
  39         if ((nwritten = pwrite(fd, wbuf, size, off)) < 0) e(3);
  40         if ((rbuf = malloc(sizeof(char)*nwritten)) == NULL) e(4);
  41         if ((nread = pread(fd, rbuf, nwritten, off)) < 0) e(5);
  42         if (strncmp(rbuf, wbuf, nread) != 0) e(6);
  43
  44         close(fd);
  45         free(wbuf);
  46         unlink(filename);
  47 }
  48
  49
  50 int main(void)
  51 {
  52         start(54);
  53         do_test();
  54         quit();
  55         return(-1);     /* Unreachable */
  56 }