method

fsync

v1_8_7_72 - Show latest stable - 0 notes - 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.

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/*
 *  call-seq:
 *     ios.fsync   => 0 or nil
 *  
 *  Immediately writes all buffered data in <em>ios</em> to disk.
 *  Returns <code>nil</code> if the underlying operating system does not
 *  support <em>fsync(2)</em>. Note that <code>fsync</code> differs from
 *  using <code>IO#sync=</code>. 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(io)
    VALUE io;
{
#ifdef HAVE_FSYNC
    rb_io_t *fptr;
    FILE *f;

    GetOpenFile(io, fptr);
    f = GetWriteFile(fptr);

    io_fflush(f, fptr);
    if (fsync(fileno(f)) < 0)
        rb_sys_fail(fptr->path);
    return INT2FIX(0);
#else
    rb_notimplement();
    return Qnil;                /* not reached */
#endif
}

fsync

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