End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IO#sync
sync → true or false
io.c
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static VALUE
rb_io_sync(VALUE io)
{
rb_io_t *fptr;
io = GetWriteIO(io);
GetOpenFile(io, fptr);
return RBOOL(fptr->mode & FMODE_SYNC);
}
Returns the current sync mode of the stream. When sync mode is true, all output is immediately flushed to the underlying operating system and is not buffered by Ruby internally. See also fsync.
Example
f = File.open('t.tmp', 'w') f.sync # => false f.sync = true f.sync # => true f.close