go to
> close(2)
> fcloseall(3)
> fflush(3)
> fopen(3)
> setbuf(3)
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fclose

man page of fclose

fclose: close a stream

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 invocation 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 //www.kernel.org/doc/man-pages/. FCLOSE(3)
 
 
 

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