PROLOG

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

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 .