1*5c2921b0SApple OSS Distributions #include <stdio.h> 2*5c2921b0SApple OSS Distributions #include <fcntl.h> 3*5c2921b0SApple OSS Distributions #include <util.h> 4*5c2921b0SApple OSS Distributions #include <unistd.h> 5*5c2921b0SApple OSS Distributions #include <darwintest.h> 6*5c2921b0SApple OSS Distributions 7*5c2921b0SApple OSS Distributions T_DECL(dev_zero, 8*5c2921b0SApple OSS Distributions "test reading from /dev/zero", 9*5c2921b0SApple OSS Distributions T_META_ASROOT(false)) 10*5c2921b0SApple OSS Distributions { 11*5c2921b0SApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, NULL, NULL); 12*5c2921b0SApple OSS Distributions char buffer[100]; 13*5c2921b0SApple OSS Distributions 14*5c2921b0SApple OSS Distributions for (int i = 0; i < 100; i++) { 15*5c2921b0SApple OSS Distributions buffer[i] = 0xff; 16*5c2921b0SApple OSS Distributions } 17*5c2921b0SApple OSS Distributions 18*5c2921b0SApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*5c2921b0SApple OSS Distributions 20*5c2921b0SApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*5c2921b0SApple OSS Distributions 22*5c2921b0SApple OSS Distributions for (int i = 0; i < 100; i++) { 23*5c2921b0SApple OSS Distributions if (buffer[i]) { 24*5c2921b0SApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*5c2921b0SApple OSS Distributions } 26*5c2921b0SApple OSS Distributions } 27*5c2921b0SApple OSS Distributions 28*5c2921b0SApple OSS Distributions close(dev); 29*5c2921b0SApple OSS Distributions } 30