NAME

       h_errno - error return value for network database operations

SYNOPSIS

       #include <netdb.h>

DESCRIPTION

       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.

RETURN VALUE

       None.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       Applications  should  obtain  the  definition of h_errno by the inclusion of the <netdb.h>
       header.

RATIONALE

       None.

FUTURE DIRECTIONS

       h_errno may be withdrawn in a future version.

SEE ALSO

       endhostent() , errno() , the Base Definitions volume of IEEE Std 1003.1-2001, <netdb.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .