linux man page for fclose

FCLOSE(3)						     Linux Programmer's Manual							 FCLOSE(3)

NAME
       fclose - close a stream

SYNOPSIS
       #include <stdio.h>

       int fclose(FILE *fp);

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

       The behaviour of fclose() is undefined if the stream parameter is an illegal pointer, or is a descriptor already passed to a previous invo-
       cation of fclose().

RETURN VALUE
       Upon  successful  completion  0	is  returned.	Otherwise, EOF is returned and the global variable 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 fp 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).

CONFORMING TO
       C89, C99.

NOTES
       Note that fclose() only flushes 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), fopen(3), setbuf(3)

COLOPHON
       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2009-02-23								 FCLOSE(3)