1*27b03b36SApple OSS Distributions #include <stdio.h> 2*27b03b36SApple OSS Distributions #include <fcntl.h> 3*27b03b36SApple OSS Distributions #include <util.h> 4*27b03b36SApple OSS Distributions #include <unistd.h> 5*27b03b36SApple OSS Distributions #include <darwintest.h> 6*27b03b36SApple OSS Distributions 7*27b03b36SApple OSS Distributions T_DECL(dev_zero, 8*27b03b36SApple OSS Distributions "test reading from /dev/zero", 9*27b03b36SApple OSS Distributions T_META_ASROOT(false)) 10*27b03b36SApple OSS Distributions { 11*27b03b36SApple OSS Distributions int dev = opendev("/dev/zero", O_RDONLY, NULL, NULL); 12*27b03b36SApple OSS Distributions char buffer[100]; 13*27b03b36SApple OSS Distributions 14*27b03b36SApple OSS Distributions for (int i = 0; i < 100; i++) { 15*27b03b36SApple OSS Distributions buffer[i] = 0xff; 16*27b03b36SApple OSS Distributions } 17*27b03b36SApple OSS Distributions 18*27b03b36SApple OSS Distributions int rd_sz = read(dev, buffer, sizeof(buffer)); 19*27b03b36SApple OSS Distributions 20*27b03b36SApple OSS Distributions T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); 21*27b03b36SApple OSS Distributions 22*27b03b36SApple OSS Distributions for (int i = 0; i < 100; i++) { 23*27b03b36SApple OSS Distributions if (buffer[i]) { 24*27b03b36SApple OSS Distributions T_FAIL("Unexpected non-zero character read from /dev/zero"); 25*27b03b36SApple OSS Distributions } 26*27b03b36SApple OSS Distributions } 27*27b03b36SApple OSS Distributions 28*27b03b36SApple OSS Distributions close(dev); 29*27b03b36SApple OSS Distributions } 30