End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IO#fsync
fsync → 0
io.c
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static VALUE
rb_io_fsync(VALUE io)
{
rb_io_t *fptr;
io = GetWriteIO(io);
GetOpenFile(io, fptr);
if (io_fflush(fptr) < 0)
rb_sys_fail_on_write(fptr);
if ((int)rb_thread_io_blocking_region(nogvl_fsync, fptr, fptr->fd) < 0)
rb_sys_fail_path(fptr->pathv);
return INT2FIX(0);
}
Immediately writes to disk all data buffered in the stream, via the operating system’s fsync(2).
Note this difference:
-
IO#sync=: Ensures that data is flushed from the stream’s internal buffers, but does not guarantee that the operating system actually writes the data to disk. -
IO#fsync: Ensures both that data is flushed from internal buffers, and that data is written to disk.
Raises an exception if the operating system does not support fsync(2).