1FWIDE(3P)                  POSIX Programmer's Manual                 FWIDE(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       fwide - set stream orientation
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SYNOPSIS

15       #include <stdio.h>
16       #include <wchar.h>
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18       int fwide(FILE *stream, int mode);
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DESCRIPTION

22       The fwide() function shall determine  the  orientation  of  the  stream
23       pointed  to by stream. If mode is greater than zero, the function first
24       attempts to make the stream wide-oriented.  If mode is less than  zero,
25       the  function  first  attempts to make the stream byte-oriented. Other‐
26       wise, mode is zero and the function does not alter the  orientation  of
27       the stream.
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29       If  the  orientation of the stream has already been determined, fwide()
30       shall not change it.
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32       Since no return value is reserved to indicate an error, an  application
33       wishing  to check for error situations should set errno to 0, then call
34       fwide(), then check errno, and if it is non-zero, assume an  error  has
35       occurred.
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RETURN VALUE

38       The  fwide()  function shall return a value greater than zero if, after
39       the call, the stream has wide-orientation, a value less  than  zero  if
40       the  stream has byte-orientation, or zero if the stream has no orienta‐
41       tion.
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ERRORS

44       The fwide() function may fail if:
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46       EBADF  The stream argument is not a valid stream.
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49       The following sections are informative.
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EXAMPLES

52       None.
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APPLICATION USAGE

55       A call to fwide() with mode set to zero can be used  to  determine  the
56       current orientation of a stream.
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RATIONALE

59       None.
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FUTURE DIRECTIONS

62       None.
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SEE ALSO

65       The Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>
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68       Portions  of  this text are reprinted and reproduced in electronic form
69       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
70       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
71       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
72       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
73       event of any discrepancy between this version and the original IEEE and
74       The  Open Group Standard, the original IEEE and The Open Group Standard
75       is the referee document. The original Standard can be  obtained  online
76       at http://www.opengroup.org/unix/online.html .
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80IEEE/The Open Group                  2003                            FWIDE(3P)
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