errx
#define errx(exitstatus, ...) error(__VA_ARGS__)
errx(int eval, const char *fmt, ...)
errx(int r, const char *fmt, ...)
static void errx(int status, const char *fmt, ...)
static void errx(int status, const char *fmt, ...)
static void errx(int status, const char *fmt, ...)
errx(int eval, const char *fmt, ...)
# define errx(rc,msg,...) do { puts(msg); exit(rc); } while (0)