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FCLOSE(3) Linux Programmer's 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
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 behaviour.
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, e.g. with sync(2) or fsync(2).
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3)
BSD MANPAGE 1993-11-29 FCLOSE(3)
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