fwide(3C)fwide(3C)NAMEfwide() - set stream orientation
The function determines the orientation of the stream pointed to by
stream. If mode is greater than zero, the function first attempts to
make the stream wide-oriented. If mode is less than zero, the function
first attempts to make the stream byte-oriented. Otherwise, mode is
zero and the function does not alter the orientation of the stream.
If the orientation of the stream has already been determined, does not
change it. Because no return value is reserved to indicate an error,
an application wishing to check for error situations should set to 0,
then call then check and if it is non-zero, assume an error has
A call to with mode set to 0 can be used to determine the current ori‐
entation of a stream.
The prototype of this function is available to applications if they
b. Compiled with macro with a value >=500.
c. Compiled with macro with a value >= 200112.
The function returns a value greater than zero if, after the call, the
stream has wide-orientation, a value less than zero if the stream has
byte-orientation, or zero if the stream has no orientation.
The function may fail if:
The stream argument is not a valid stream.
was developed by HP and Mitsubishi Electric Corporation.
SEE ALSOorientation(5), thread_safety(5).