tests/dev_zero.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <util.h>
   4 #include <unistd.h>
   5 #include <darwintest.h>
   6
   7 T_DECL(dev_zero,
   8     "test reading from /dev/zero",
   9     T_META_ASROOT(false))
  10 {
  11         int dev = opendev("/dev/zero", O_RDONLY, NULL, NULL);
  12         char buffer[100];
  13
  14         for (int i = 0; i < 100; i++) {
  15                 buffer[i] = 0xff;
  16         }
  17
  18         int rd_sz = read(dev, buffer, sizeof(buffer));
  19
  20         T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed");
  21
  22         for (int i = 0; i < 100; i++) {
  23                 if (buffer[i]) {
  24                         T_FAIL("Unexpected non-zero character read from /dev/zero");
  25                 }
  26         }
  27
  28         close(dev);
  29 }