The functionality described on this reference page is aligned with
the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional.
This volume of IEEE Std 1003.1-2001 defers to
the ISO C standard.
The fputwc() function shall write the character corresponding
to the wide-character code wc to the output stream
pointed to by stream, at the position indicated by the associated
file-position indicator for the stream (if defined), and
advances the indicator appropriately. If the file cannot support positioning
requests, or if the stream was opened with append
mode, the character is appended to the output stream. If an error
occurs while writing the character, the shift state of the output
file is left in an undefined state.
The
st_ctime and st_mtime fields of the file shall be marked
for update between the successful execution of
fputwc() and the next successful completion of a call to fflush()
or fclose() on the same stream or a call to exit()
or abort().
RETURN VALUE
Upon successful completion, fputwc() shall return wc.
Otherwise, it shall return WEOF, the error indicator for the
stream shall be set, and errno shall be set to indicate
the error.
ERRORS
The fputwc() function shall fail if either the stream is unbuffered
or data in the stream's buffer needs to be
written, and:
EAGAIN
The O_NONBLOCK flag is set for the file descriptor underlying stream
and the process would be delayed in the write
operation.
EBADF
The file descriptor underlying stream is not a valid file descriptor
open for writing.
EFBIG
An
attempt was made to write to a file that exceeds the maximum file
size or the process' file size limit.
EFBIG
The file is a regular file and an attempt was made to write at or
beyond the offset maximum associated with the corresponding
stream.
EILSEQ
The wide-character code wc does not correspond to a valid character.
EINTR
The write operation was terminated due to the receipt of a signal,
and no data was transferred.
EIO
A
physical I/O error has occurred, or the process is a member of a background
process group attempting to write to its controlling
terminal, TOSTOP is set, the process is neither ignoring nor blocking
SIGTTOU, and the process group of the process is orphaned.
This error may also be returned under implementation-defined conditions.
ENOSPC
There was no free space remaining on the device containing the file.
EPIPE
An
attempt is made to write to a pipe or FIFO that is not open for reading
by any process. A SIGPIPE signal shall also be sent to the
thread.
The fputwc() function may fail if:
ENOMEM
Insufficient storage space is available.
ENXIO
A
request was made of a nonexistent device, or the request was outside
the capabilities of the device.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
ferror() , fopen() , setbuf()
, ulimit() , the Base Definitions volume of IEEE Std 1003.1-2001,
<stdio.h>, <wchar.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- 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 .
