fclose(3)                  Library Functions Manual                  fclose(3)

NAME
       fclose - close a stream

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #include <stdio.h>

       int fclose(FILE *stream);

DESCRIPTION
       The fclose() function flushes the stream pointed to by stream (writing
       any buffered output data using fflush(3)) and closes the underlying
       file descriptor.

RETURN VALUE
       Upon successful completion, 0 is returned.  Otherwise, EOF is returned
       and errno is set to indicate the error.  In either case, any further
       access (including another call to fclose()) to the stream results in
       undefined behavior.

ERRORS
       EBADF  The file descriptor underlying stream is not valid.

       The fclose() function may also fail and set errno for any of the errors
       specified for the routines close(2), write(2), or fflush(3).

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |fclose ()                                   | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
STANDARDS
       C11, POSIX.1-2008.

HISTORY
       C89, POSIX.1-2001.

NOTES
       Note that fclose() flushes only the user-space buffers provided by the
       C library.  To ensure that the data is physically stored on disk the
       kernel buffers must be flushed too, for example, with sync(2) or
       fsync(2).

SEE ALSO
       close(2), fcloseall(3), fflush(3), fileno(3), fopen(3), setbuf(3)

Linux man-pages 6.7               2023-10-31                         fclose(3)