method

fsync

v1_9_1_378 - Show latest stable - Class: IO

fsync()

public

Immediately writes all buffered data in ios to disk. Returns nil if the underlying operating system does not support fsync(2). Note that fsync differs from using IO#sync=. The latter ensures that data is flushed from Ruby’s buffers, but doesn’t not guarantee that the underlying operating system actually writes it to disk.

static VALUE
rb_io_fsync(VALUE io)
{
#ifdef HAVE_FSYNC
    rb_io_t *fptr;

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

    if (io_fflush(fptr) < 0)
        rb_sys_fail(0);
    if (fsync(fptr->fd) < 0)
        rb_sys_fail_path(fptr->pathv);
    return INT2FIX(0);
#else
    rb_notimplement();
    return Qnil;                /* not reached */
#endif
}

fsync

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