1*d8b80295SApple OSS Distributions #include <stdio.h> 2*d8b80295SApple OSS Distributions #include <fcntl.h> 3*d8b80295SApple OSS Distributions #include <util.h> 4*d8b80295SApple OSS Distributions #include <unistd.h> 5*d8b80295SApple OSS Distributions #include <darwintest.h> 6*d8b80295SApple OSS Distributions 7*d8b80295SApple OSS Distributions T_DECL(dev_zero, 8*d8b80295SApple OSS Distributions "test reading from /dev/zero", 9*d8b80295SApple OSS Distributions T_META_ASROOT(false)) 10*d8b80295SApple OSS Distributions { 11*d8b80295SApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, 0, NULL); 12*d8b80295SApple OSS Distributions char buffer[100]; 13*d8b80295SApple OSS Distributions 14*d8b80295SApple OSS Distributions for (int i = 0; i < 100; i++) { 15*d8b80295SApple OSS Distributions buffer[i] = 0xff; 16*d8b80295SApple OSS Distributions } 17*d8b80295SApple OSS Distributions 18*d8b80295SApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*d8b80295SApple OSS Distributions 20*d8b80295SApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*d8b80295SApple OSS Distributions 22*d8b80295SApple OSS Distributions for (int i = 0; i < 100; i++) { 23*d8b80295SApple OSS Distributions if (buffer[i]) { 24*d8b80295SApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*d8b80295SApple OSS Distributions } 26*d8b80295SApple OSS Distributions } 27*d8b80295SApple OSS Distributions 28*d8b80295SApple OSS Distributions close(dev); 29*d8b80295SApple OSS Distributions } 30