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 (con-
       sult 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  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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                     FPUTC(3P)