1*0f4c859eSApple OSS Distributions #include <stdio.h> 2*0f4c859eSApple OSS Distributions #include <fcntl.h> 3*0f4c859eSApple OSS Distributions #include <util.h> 4*0f4c859eSApple OSS Distributions #include <unistd.h> 5*0f4c859eSApple OSS Distributions #include <darwintest.h> 6*0f4c859eSApple OSS Distributions 7*0f4c859eSApple OSS Distributions T_DECL(dev_zero, 8*0f4c859eSApple OSS Distributions "test reading from /dev/zero", 9*0f4c859eSApple OSS Distributions T_META_ASROOT(false)) 10*0f4c859eSApple OSS Distributions { 11*0f4c859eSApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, 0, NULL); 12*0f4c859eSApple OSS Distributions char buffer[100]; 13*0f4c859eSApple OSS Distributions 14*0f4c859eSApple OSS Distributions for (int i = 0; i < 100; i++) { 15*0f4c859eSApple OSS Distributions buffer[i] = 0xff; 16*0f4c859eSApple OSS Distributions } 17*0f4c859eSApple OSS Distributions 18*0f4c859eSApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*0f4c859eSApple OSS Distributions 20*0f4c859eSApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*0f4c859eSApple OSS Distributions 22*0f4c859eSApple OSS Distributions for (int i = 0; i < 100; i++) { 23*0f4c859eSApple OSS Distributions if (buffer[i]) { 24*0f4c859eSApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*0f4c859eSApple OSS Distributions } 26*0f4c859eSApple OSS Distributions } 27*0f4c859eSApple OSS Distributions 28*0f4c859eSApple OSS Distributions close(dev); 29*0f4c859eSApple OSS Distributions } 30