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FPUTC(3P)                  POSIX Programmer's Manual                 FPUTC(3P)

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
       fputc - put a byte on a stream
SYNOPSIS
       #include <stdio.h>
       int fputc(int c, FILE *stream);

DESCRIPTION
       The fputc() function shall write the byte specified by c (converted  to
       an  unsigned  char)  to  the output stream pointed to by stream, at the
       position indicated by the associated file-position  indicator  for  the
       stream  (if defined), and shall advance the indicator appropriately. If
       the file cannot support positioning requests,  or  if  the  stream  was
       opened  with  append  mode,  the  byte  shall be appended to the output
       stream.
       The st_ctime and st_mtime fields of the file shall be marked for update
       between  the  successful  execution  of fputc() 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, fputc() shall return the value it has writ-
       ten. Otherwise, it shall return EOF, the error indicator for the stream
       shall be set,  and errno shall be set to indicate the error.
ERRORS
       The  fputc()  function shall fail if either the stream is unbuffered or
       the stream's buffer needs to be flushed, 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.
       EFBIG  An attempt was made to write to a file that exceeds 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.
       EINTR  The  write operation was terminated due to the receipt of a sig-
              nal, 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 control-
              ling 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 fputc() 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(), getrlimit(), putc(), puts(), setbuf(), ulimit(), the
       Base Definitions volume of IEEE Std 1003.1-2001, <stdio.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 .

IEEE/The Open Group                  2003                            FPUTC(3P)