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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 functionality described on this reference page is aligned with  the
       ISO C  standard.  Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1-2008
       defers to the ISO C standard.
       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  last  data  modification and last file status change timestamps 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 thread 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  file
              size limit of the process.
       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 calling thread is not blocking
              SIGTTOU, the process is not ignoring 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
       Section 2.5, Standard  I/O  Streams,  ferror(),  fopen(),  getrlimit(),
       putc(), puts(), setbuf(), ulimit()
       The Base Definitions volume of POSIX.1-2008, <stdio.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                            FPUTC(3P)