fclose - close a stream
int fclose(FILE *stream);
The fclose() function flushes the stream pointed to by stream
(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().
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
- 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).
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C89, C99.
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
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