__printf0like
void err(int, const char *, ...) __dead2 __printf0like(2, 3);
void verr(int, const char *, __va_list) __dead2 __printf0like(2, 0);
void errc(int, int, const char *, ...) __dead2 __printf0like(3, 4);
__printf0like(3, 0);
void errx(int, const char *, ...) __dead2 __printf0like(2, 3);
void verrx(int, const char *, __va_list) __dead2 __printf0like(2, 0);
void warn(const char *, ...) __printf0like(1, 2);
void vwarn(const char *, __va_list) __printf0like(1, 0);
void warnc(int, const char *, ...) __printf0like(2, 3);
void vwarnc(int, const char *, __va_list) __printf0like(2, 0);