fclose(3p) — Linux manual page


FCLOSE(3P)                POSIX Programmer's Manual               FCLOSE(3P)

PROLOG         top

       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         top

       fclose — close a stream

SYNOPSIS         top

       #include <stdio.h>

       int fclose(FILE *stream);

DESCRIPTION         top

       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

RETURN VALUE         top

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

ERRORS         top

       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

       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         top




RATIONALE         top




SEE ALSO         top

       Section 2.5, Standard I/O Streams, close(3p), fmemopen(3p),
       fopen(3p), getrlimit(3p), open_memstream(3p), ulimit(3p)

       The Base Definitions volume of POSIX.1‐2008, stdio.h(0p)

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013                          FCLOSE(3P)

Pages that refer to this page: stdio.h(0p)close(3p)fdopen(3p)fopen(3p)freopen(3p)open_memstream(3p)open_wmemstream(3p)stderr(3p)stdin(3p)stdout(3p)