h_errno - error return value for network database operations
[OB] #include <netdb.h>
This method of returning errors is used only in connection with obsolescent functions.
The <netdb.h> header provides a declaration of h_errno as a modifiable lvalue of type int.
It is unspecified whether h_errno is a macro or an identifier declared with external linkage. If a macro definition is suppressed in order to access an actual object, or a program defines an identifier with the name h_errno, the behavior is undefined.
No errors are defined.
Applications should obtain the definition of h_errno by the inclusion of the <netdb.h> header.
h_errno may be withdrawn in a future version.
endhostent(), errno(), the Base Definitions volume of IEEE Std 1003.1-2001, <netdb.h>
First released in Issue 6. Derived from the XNS, Issue 5.2 specification.