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| From: | "PAULUS, Raimund, TI-ABN" <Raimund DOT Paulus AT dillinger DOT biz> |
| To: | "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com> |
| Subject: | Re: RPC clnt_create() adress already in use |
| Date: | Tue, 30 Jan 2018 10:07:35 +0000 |
| Message-ID: | <59D90AF8D70E9740907BACDE2BCB520836E01220@RESW102.resdom01.local> |
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--_002_59D90AF8D70E9740907BACDE2BCB520836E01220RESW102resdom01_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hi Mark,
in my email (https://sourceware.org/ml/cygwin/2017-12/msg00194.html) i desc=
ribed 2 approaches. I prefer nr 1.
Here the part of the source in bindresvport.c:
---------------------------------------------------------------------------=
---------------------------------------
if (port =3D=3D 0) {
port =3D (getpid() % NPORTS) + STARTPORT;
}
res =3D -1;
errno =3D EADDRINUSE;
/* fix for bind() */
port =3D 0;
again:
for (i =3D 0; i < nports; ++i) {
*portp =3D htons(port++);
if (port > endport)
port =3D startport;
res =3D bind(sd, sa, salen);
if (res >=3D 0 || errno !=3D EADDRINUSE)
break;
}
if (i =3D=3D nports && startport !=3D LOWPORT) {
startport =3D LOWPORT;
endport =3D STARTPORT - 1;
nports =3D STARTPORT - LOWPORT;
port =3D LOWPORT + port % (STARTPORT - LOWPORT);
goto again;
}
mutex_unlock(&port_lock);
return (res);
}
---------------------------------------------------------------------------=
----------------------------
This causes bind() to search an unused port. I use libtirpc with this fix s=
ince several weeks and it works for me. I don't know an other way (fixing C=
ygwin) to success.
The RPC-client on my pc is started every few minutes and has to connect to =
the RPC-server. Without the fix libtirpc is not usable and I have to use C=
ygwin 1.5.18 with the old librpc.
Raimund
-----Urspr=FCngliche Nachricht-----
Von: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] Im Auftrag vo=
n Mark Geisert
Gesendet: Dienstag, 30. Januar 2018 10:05
An: cygwin AT cygwin DOT com
Betreff: Re: RPC clnt_create() adress already in use
PAULUS, Raimund, TI-ABN wrote:
> Hi Mark,
> as Corinna wrote in the thread " Cygwin socket option SO_REUSEADDR operat=
es unlike Linux", the cause for the problem in libtirpc is Microsofts imple=
mentation of socket handling. If i implement a simple socket client, that i=
s not so much of an issue, because I call the functions separately and can =
handle the error. Moreover in this case bind() is not necessary.
> But in the case of libtirpc the implementation of clnttcp_create() determ=
ines the sequence of bind() and connect() for the local port and you cannot=
correct the error of bind() after the call of connect(). Therefore I think=
best is to set the port number to zero (port =3D 0) before the call to bin=
d().
>
> Raimund
>
>
> -----Urspr=FCngliche Nachricht-----
> Von: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] Im=20
> Auftrag von PAULUS, Raimund, TI-ABN
> Gesendet: Dienstag, 9. Januar 2018 09:14
> An: cygwin AT cygwin DOT com
> Betreff: WG: AW: RPC clnt_create() adress already in use
[...]
Hi Raimund,
Where, exactly, would you set the port number to zero? I can imagine how t=
his would solve the problem you're seeing but I'm concerned about other use=
cases.
It also seems a little odd to me we'd be making a Cygwin-specific patch rat=
her than "fixing" Cygwin itself so the patch would not be necessary. But I=
don't feel strongly either way here. libtirpc already has Cygwin-specific=
patches.
..mark
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--_002_59D90AF8D70E9740907BACDE2BCB520836E01220RESW102resdom01_
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