FPUTWC(3)                  POSIX Programmer's Manual                 FPUTWC(3)



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

NAME
       fputwc -- put a wide-character code on a stream

SYNOPSIS
       #include <stdio.h>
       #include <wchar.h>

       wint_t fputwc(wchar_t wc, FILE *stream);

DESCRIPTION
       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 POSIX.1-2017
       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 last data modification and last file status change timestamps 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().

       The fputwc() function shall not change the setting of errno if
       successful.

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 thread 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 file size limit of the process.

       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 calling thread is not
              blocking SIGTTOU, the process is not ignoring 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
       Section 2.5, Standard I/O Streams, ferror(), fopen(), setbuf(),
       ulimit()

       The Base Definitions volume of POSIX.1-2017, <stdio.h>, <wchar.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                            FPUTWC(3)
