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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)
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