MAGICSTR
strcpy(buf, MAGICSTR);
ATF_REQUIRE_STREQ(buf, MAGICSTR);
assert(sizeof(buf) > sizeof(MAGICSTR));
if (rump_sys_write(fd, MAGICSTR, sizeof(MAGICSTR)) != sizeof(MAGICSTR))
ATF_REQUIRE_STREQ(buf, MAGICSTR);
if (rump_sys_read(fd, buf, sizeof(buf)) != sizeof(MAGICSTR))
ATF_REQUIRE_STREQ(buf, MAGICSTR);
char buf[sizeof(MAGICSTR)];
if (rump_sys_write(fd, MAGICSTR, sizeof(MAGICSTR)) != sizeof(MAGICSTR))