herror() -- write error message to standard output based on h

SYNOPSIS

#include <netdb.h>

void herror(const char *s);

The herror() function produces a message on the standard error output describing the error condition associated with the current value of h_errno. The string s is printed first, followed by a colon, a blank, the error message and a newline. If s is a null pointer or points to a null string, the colon is not printed.