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H_ERRNO(3P)                POSIX Programmer's Manual               H_ERRNO(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 defi-
       nition 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       h_errno may be withdrawn in a future version.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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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(3P)