1*c54f35caSApple OSS Distributions #include <stdio.h> 2*c54f35caSApple OSS Distributions #include <fcntl.h> 3*c54f35caSApple OSS Distributions #include <util.h> 4*c54f35caSApple OSS Distributions #include <unistd.h> 5*c54f35caSApple OSS Distributions #include <darwintest.h> 6*c54f35caSApple OSS Distributions 7*c54f35caSApple OSS Distributions T_DECL(dev_zero, 8*c54f35caSApple OSS Distributions "test reading from /dev/zero", 9*c54f35caSApple OSS Distributions T_META_ASROOT(false)) 10*c54f35caSApple OSS Distributions { 11*c54f35caSApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, NULL, NULL); 12*c54f35caSApple OSS Distributions char buffer[100]; 13*c54f35caSApple OSS Distributions 14*c54f35caSApple OSS Distributions for (int i = 0; i < 100; i++) { 15*c54f35caSApple OSS Distributions buffer[i] = 0xff; 16*c54f35caSApple OSS Distributions } 17*c54f35caSApple OSS Distributions 18*c54f35caSApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*c54f35caSApple OSS Distributions 20*c54f35caSApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*c54f35caSApple OSS Distributions 22*c54f35caSApple OSS Distributions for (int i = 0; i < 100; i++) { 23*c54f35caSApple OSS Distributions if (buffer[i]) { 24*c54f35caSApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*c54f35caSApple OSS Distributions } 26*c54f35caSApple OSS Distributions } 27*c54f35caSApple OSS Distributions 28*c54f35caSApple OSS Distributions close(dev); 29*c54f35caSApple OSS Distributions } 30