ios.sync = boolean   → boolean

Sets the ``sync mode’’ to true or false. When sync mode is true, all output is immediately flushed to the underlying operating system and is not buffered internally. Returns the new state. See also IO#fsync.

f = File.new("testfile")
f.sync = true

(produces no output)

Source Code

/*
*  call-seq:
*     ios.sync = boolean   => boolean
*  
*  Sets the ``sync mode'' to <code>true</code> or <code>false</code>.
*  When sync mode is true, all output is immediately flushed to the
*  underlying operating system and is not buffered internally. Returns
*  the new state. See also <code>IO#fsync</code>.
*     
*     f = File.new("testfile")
*     f.sync = true
*     
*  <em>(produces no output)</em>
*/

static VALUE
rb_io_set_sync(io, mode)
   VALUE io, mode;
{
   OpenFile *fptr;

   GetOpenFile(io, fptr);
   if (RTEST(mode)) {
       fptr->mode |= FMODE_SYNC;
   }
   else {
       fptr->mode &= ~FMODE_SYNC;
   }
   return mode;
}