method

flush

v1_9_3_125 - Show latest stable - Class: IO

flush()

public

Flushes any buffered data within ios to the underlying operating system (note that this is Ruby internal buffering only; the OS may buffer the data as well).

$stdout.print "no newline"
$stdout.flush

produces:

no newline

VALUE
rb_io_flush(VALUE io)
{
    rb_io_t *fptr;

    if (TYPE(io) != T_FILE) {
        return rb_funcall(io, id_flush, 0);
    }

    io = GetWriteIO(io);
    GetOpenFile(io, fptr);

    if (fptr->mode & FMODE_WRITABLE) {
        if (io_fflush(fptr) < 0)
            rb_sys_fail(0);
#ifdef _WIN32
        if (GetFileType((HANDLE)rb_w32_get_osfhandle(fptr->fd)) == FILE_TYPE_DISK) {
            fsync(fptr->fd);
        }
#endif
    }
    if (fptr->mode & FMODE_READABLE) {
        io_unread(fptr);
    }

    return io;
}

flush

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