1*d4514f0bSApple OSS Distributions #include <stdio.h> 2*d4514f0bSApple OSS Distributions #include <fcntl.h> 3*d4514f0bSApple OSS Distributions #include <util.h> 4*d4514f0bSApple OSS Distributions #include <unistd.h> 5*d4514f0bSApple OSS Distributions #include <darwintest.h> 6*d4514f0bSApple OSS Distributions 7*d4514f0bSApple OSS Distributions T_DECL(dev_zero, 8*d4514f0bSApple OSS Distributions "test reading from /dev/zero", 9*d4514f0bSApple OSS Distributions T_META_ASROOT(false)) 10*d4514f0bSApple OSS Distributions { 11*d4514f0bSApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, 0, NULL); 12*d4514f0bSApple OSS Distributions char buffer[100]; 13*d4514f0bSApple OSS Distributions 14*d4514f0bSApple OSS Distributions for (int i = 0; i < 100; i++) { 15*d4514f0bSApple OSS Distributions buffer[i] = 0xff; 16*d4514f0bSApple OSS Distributions } 17*d4514f0bSApple OSS Distributions 18*d4514f0bSApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*d4514f0bSApple OSS Distributions 20*d4514f0bSApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*d4514f0bSApple OSS Distributions 22*d4514f0bSApple OSS Distributions for (int i = 0; i < 100; i++) { 23*d4514f0bSApple OSS Distributions if (buffer[i]) { 24*d4514f0bSApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*d4514f0bSApple OSS Distributions } 26*d4514f0bSApple OSS Distributions } 27*d4514f0bSApple OSS Distributions 28*d4514f0bSApple OSS Distributions close(dev); 29*d4514f0bSApple OSS Distributions } 30