posix man page for h_errno

H_ERRNO(P)						     POSIX Programmer's Manual							H_ERRNO(P)

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       h_errno may be withdrawn in a future version.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 Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003								H_ERRNO(P)