Linux 2.6 - man page for fclose (linux section 3)
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FCLOSE(3) Linux Programmer's Manual FCLOSE(3)
fclose - close a stream
int fclose(FILE *fp);
The fclose() function flushes the stream pointed to by fp (writing any buffered output
data using fflush(3)) and closes the underlying file descriptor.
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.
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 fsync(2).
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3)
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GNU 2009-02-23 FCLOSE(3)
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