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h_errno(3) [posix man page]

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       h_errno may be withdrawn in a future version.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)

Check Out this Related Man Page

<assert.h>(P)						     POSIX Programmer's Manual						     <assert.h>(P)

NAME

       assert.h - verify program assertion

SYNOPSIS

       #include <assert.h>

DESCRIPTION

       The  <assert.h>	header	shall  define  the assert() macro.  It refers to the macro NDEBUG which is not defined in the header. If NDEBUG is
       defined as a macro name before the inclusion of this header, the assert() macro shall be defined simply as:

	      #define assert(ignore)((void) 0)

       Otherwise, the macro behaves as described in assert().

       The assert() macro shall be redefined according to the current state of NDEBUG each time <assert.h> is included.

       The assert() macro shall be implemented as a macro, not as a function. If the macro definition is suppressed in order to access	an  actual
       function, the behavior is undefined.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The System Interfaces volume of IEEE Std 1003.1-2001, assert()

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							     <assert.h>(P)
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