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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 dif-
       fer (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 written. 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 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  SIGT-
              TOU,  and the process group of the process is orphaned.  This error may also be returned under implemen-
              tation-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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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)