REQUIRE_LIBC
#define RL(x) REQUIRE_LIBC(x, -1)
REQUIRE_LIBC(save = strdup(cbuf), NULL);
REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR);
REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR);
REQUIRE_LIBC(f = malloc(todo), NULL);