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

       fclose — close a stream

SYNOPSIS

       #include <stdio.h>

       int fclose(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  fclose()  function shall cause the stream pointed to by stream to be flushed and the associated file
       to be closed. Any unwritten buffered data for the stream  shall  be  written  to  the  file;  any  unread
       buffered  data  shall  be  discarded. Whether or not the call succeeds, the stream shall be disassociated
       from the file and any buffer set by the setbuf() or setvbuf() function shall be  disassociated  from  the
       stream. If the associated buffer was automatically allocated, it shall be deallocated.

       If  the  file  is  not  already  at  EOF,  and the file is one capable of seeking, the file offset of the
       underlying open file description shall be set to the file position of the stream if  the  stream  is  the
       active handle to the underlying file description.

       The  fclose()  function  shall  mark  for  update  the last data modification and last file status change
       timestamps of the underlying file, if the stream was writable, and if buffered data remains that has  not
       yet been written to the file. The fclose() function shall perform the equivalent of a close() on the file
       descriptor that is associated with the stream pointed to by stream.

       After the call to fclose(), any use of stream results in undefined behavior.

RETURN VALUE

       Upon successful completion, fclose() shall return 0; otherwise, it shall return  EOF  and  set  errno  to
       indicate the error.

ERRORS

       The fclose() function shall fail if:

       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 valid.

       EFBIG  An attempt was made to write a file that exceeds the maximum file size.

       EFBIG  An attempt was made to write 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
              associated with the corresponding stream.

       EINTR  The fclose() function was interrupted by a signal.

       EIO    The  process  is  a  member  of  a background process group attempting to write to its controlling
              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.

       ENOMEM The underlying stream was created by open_memstream() or open_wmemstream() and insufficient memory
              is available.

       ENOSPC There  was  no free space remaining on the device containing the file or in the buffer used by the
              fmemopen() function.

       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 fclose() function may fail if:

       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, close(), fmemopen(), fopen(), getrlimit(), open_memstream(), 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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .