hello,
I've a question regarding chan_shutdown_read.
This morning, while analysing the logs of one of my servers, I found several
lines like the following:
<snip source="syslog.log">
Oct 25 11:07:35 myhost sshd[...]: error: channel 2: chan_shutdown_read:
shutdown() failed for fd11 [i1 o16]: Invalid argument
Oct 25 11:07:52 myhost sshd[...]: error: channel 2: chan_shutdown_read:
shutdown() failed for fd11 [i1 o16]: Invalid argument
Oct 25 11:11:39 myhost sshd[...]: error: channel 2: chan_shutdown_read:
shutdown() failed for fd11 [i1 o128]: Invalid argument
</snip>
The host is a HP-UX B.11.11 U 9000/800 (lets call it Host A) . The users are
doing ssh session from another host (Host B) to Host A with
port forwarding.
>From the source of chan_shutdown_read function, I understand that this
error is reported due to the fact that when Host A try to close the channel
and
Host B (the writing part) has already closed it.
<snip source="nchan.c">
...
/*
* shutdown(sock, SHUT_READ) may return ENOTCONN if the
* write side has been closed already. (bug on Linux)
* HP-UX will return EINVAL.
*/
if (shutdown(c->sock, SHUT_RD) < 0
&& (errno != ENOTCONN && errno != EINVAL))
error("channel %d: chan_shutdown_read: shutdown() failed for
fd%d [i%d o%d]: %.100s",
c->self, c->sock, c->istate, c->ostate, strerror(errno));
...
</snip>
Looking at the code, I don't understand why I still have the "Invalid
argument" error reported. I'm under HP-UX so if errno is set to EINVAL
(which seems to be the case, according
to the logs), I should not get an error in the logs.
Is it due to something else ? Am' I missing something ? Is it due to the
version 11.11 of HP-UX which does not return an EINVAL in case of the socket
closed by the writing part ?
Thank you for your help.
Gr�goire Welraeds
Consultant
Logica Belgium
Tel. : + 32 (0)2 708 6305
E-mail: [EMAIL PROTECTED]
http://www.logica.com
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