"Amit S. Kale" <[EMAIL PROTECTED]> writes:
| full-write beyond end of a raw device on linux puts dd in an infinite loop.
| This is because a raw device return 0 on write beyond end of the device.
|
| I think the problem could be solved by following patches. I have tried these
| patches. dd with these patches gives correct values.
|
| Can you please include these patches in file-utils?
Thanks for the patches, however I think the proper fix is not here,
but in the kernel. What version of Linux are you using?
I just confirmed that with 2.2.9 and 2.2.14 kernels,
that dd command fails as one would expect:
$ dd if=/dev/zero of=/dev/fd0
dd: /dev/fd0: No space left on device
2881+0 records in
2880+0 records out
[Exit 1]
$
I've removed the misleading `FIXME' from the comment below.
| --- full-write.c.orig Wed Feb 25 04:47:38 1998
| +++ full-write.c Mon Apr 24 18:28:37 2000
| @@ -45,10 +45,9 @@
| while (len > 0)
| {
| int written = write (desc, ptr, len);
| - /* FIXME: write on my slackware Linux 1.2.13 returns zero when
| - I try to write more data than there is room on a floppy disk.
| - This puts dd into an infinite loop. Reproduce with
| - dd if=/dev/zero of=/dev/fd0. */
| + if (written == 0) {
| + return total_written;
| + }
| if (written < 0)
| {
| #ifdef EINTR
|
| --- dd.c.orig Wed Jan 26 16:39:01 2000
| +++ dd.c Mon Apr 24 18:41:03 2000
...
