FCLOSE(3) Linux Programmers Manual FCLOSE(3)
fclose - close a stream
int fclose(FILE *fp);
The fclose() function will flush the stream pointed to by fp (writing
any buffered output data using fflush(3)) and close the underlying file
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().
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.
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).
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
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3)
This page is part of release 3.05 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 1993-11-29 FCLOSE(3)