|| Linux Programmer's Manual
NAME fclose - close a stream
int fclose(FILE *
fclose() function flushes the stream pointed to by
fp (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.
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
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