Re: Kern/41566, Problem with pty(4) handling under NetBSD-5 filed.

[Zafer AydoÄan <zafer%aydogan.de@localhost>]

On Wed, Jun 10, 2009 at 2:44 PM, Brian
Buhrow<buhrow%lothlorien.nfbcal.org@localhost> wrote:
> Â Â Â ÂHello. ÂFurther investigation reveals a definite problem with the
> pty(4) code in NetBSD-5. ÂI've filed kern/41566 which contains a test
> program which demonstrates the problem. ÂThe test program runs flawlessly
> under NetBSD-4 and earlier, but hangs the pty it uses very reliably under
> NetBSD-5. ÂI've tried this using the I386 platform; I've not yet tested
> other platforms to see if the problem is machine independent.
> Â Â Â ÂIF someone could look at this and shed some light on what might be
> going on, that would be great.
> Â Â Â ÂHere's what the test output looks like, for those who are curious.
>
> -thanks
> -Brian
>
>
>
> Script started on Wed Jun 10 00:25:44 2009
> %./ptytest&
> [1] 1756
> %./ptytest: Master process(1756) is writing to slave process (3339)
> ./ptytest: Using pty /dev/ttyp2
> 3339: Read 26 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 28 bytes to master pty
> 3339: Read 26 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 52 bytes to master pty
> 3339: Read 50 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 76 bytes to master pty
> 3339: Read 74 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 100 bytes to master pty
> 3339: Read 98 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 124 bytes to master pty
> 3339: Read 122 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 148 bytes to master pty
> 3339: Read 146 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 172 bytes to master pty
> 3339: Read 170 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 196 bytes to master pty
> 3339: Read 194 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 220 bytes to master pty
> 3339: Read 218 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 244 bytes to master pty
> 3339: Read 242 bytes from pty
> 3339: Read 2 bytes from pty
> 1756: Wrote 268 bytes to master pty
> 3339: Read 266 bytes from pty
> 1756: Wrote 28 bytes to master pty
> 1756: Wrote 52 bytes to master pty
> 1756: Wrote 76 bytes to master pty
> 1756: Wrote 100 bytes to master pty
> 1756: Wrote 124 bytes to master pty
> 1756: Wrote 148 bytes to master pty
> 1756: Wrote 172 bytes to master pty
> 1756: Wrote 196 bytes to master pty
> 3339: Read 2 bytes from pty
> 3339: Read 26 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 50 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 74 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 98 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 122 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 146 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 170 bytes from pty
> 3339: Read 2 bytes from pty
> 3339: Read 194 bytes from pty
> 3339: Read 2 bytes from pty
>
> [Processes hang here, doing nothing]
>
> ps -l1756
> UID ÂPID PPID CPU PRI NI ÂVSZ RSS WCHAN ÂSTAT TTY Â Â ÂTIME COMMAND
> 100 1756 3460 Â 0 Â85 Â0 2896 776 ttyraw S Â Âttyp1 0:00.01 ./ptytest
> %ps -l3339
> UID ÂPID PPID CPU PRI NI ÂVSZ RSS WCHAN ÂSTAT TTY Â Â ÂTIME COMMAND
> 100 3339 1756 Â 0 Â85 Â0 2896 644 ttyraw S Â Âttyp1 0:00.00 ./ptytest
> %
> %pstat -t |grep 'ttyp2'
> ttyp2 Â 124 Â0 1024 1248 256 Â Â 82 OC Â Â Â Â Â Â0 Â Â 0 termios
> %fg
> ./ptytest
> ^C
> %exit
> %exit
>
> Script done on Wed Jun 10 00:27:23 2009
>

your script hangs on amd64 aswell.

zafer.