Provided by: manpages-dev_3.21-1_all
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
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 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 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
close(2), fcloseall(3), fflush(3), fopen(3), setbuf(3)
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