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, 0, 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 } 30