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FCLOSE(3) Linux Programmer's Manual FCLOSE(3)
fclose - close a stream
int fclose(FILE *stream);
The fclose function dissociates the named stream from its underlying file or set of func-
tions. If the stream was being used for output, any buffered data is written first, using
Upon successful completion 0 is returned. Otherwise, EOF is returned and the global vari-
able errno is set to indicate the error. In either case any further access (including
another call to fclose()) to the stream results in undefined behaviour.
EBADF The filedescriptor 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).
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, e.g.
with sync(2) or fsync(2).
The fclose function conforms to ANSI X3.159-1989 (``ANSI C'').
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3)
BSD MANPAGE 1993-11-29 FCLOSE(3)
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