#include <stdio.h> #include <fcntl.h> #include <util.h> #include <unistd.h> #include <darwintest.h> T_DECL(dev_zero, "test reading from /dev/zero", T_META_ASROOT(false)) { int dev = opendev("/dev/zero", O_RDONLY, NULL, NULL); char buffer[100]; for (int i = 0; i < 100; i++) { buffer[i] = 0xff; } int rd_sz = read(dev, buffer, sizeof(buffer)); T_EXPECT_EQ(rd_sz, 100, "read from /dev/zero failed"); for (int i = 0; i < 100; i++) { if (buffer[i]) { T_FAIL("Unexpected non-zero character read from /dev/zero"); } } close(dev); }