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.
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 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 fclose() function may also fail and set errno for any of the errors specified for the routines close(2), write(2) or fflush(3).
EBADF The file descriptor underlying fp is not valid.
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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