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, 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 .