Experimental Physics and
Industrial Control System

[email protected] (Jeff Hill) · Thu, 6 Jul 2000 09:53:51 -0600

Benjamin,

The "The search request/beacon address list was empty after initialization"
message indicates that CA was unable to auto-configure its address list.
We have had problems with this on Tornado II also. Like Tornado II, your 
version of LynxOS may be based on a more recent version of the BSD IP 
kernel. This version has changes in the network interface query API that 
are not backward compatible. A fix for this problem is in R3.13.3
which should be available in the next few days. If your version of LynxOS
does not define the macro BSD >= 44 then you may need to define the macro 
SOCKADDR_HAS_LEN in the C compiler's command line.

The short term workaround is to define EPICS_CA_ADDR_LIST. The details are
in the CA reference manual.

Jeff

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Benjamin
> Sailer
> Sent: Thursday, July 06, 2000 6:41 AM
> To: [email protected]
> Subject: Problems with the CA lib under LynxOS with R3.13.2
> 
> 
> Hello out there,
> 
> I hope this is not a to trivial Problem to commit to this mailing list,
> but I am trying to make a caServer for LynxOS to control VME Cards
> sharing the Crate with a PowerPC CPU under LynxOS. This works pretty
> fine when I am using nearly all the options for Linux (LynxOS also uses
> the gcc compiler).
> 
> But now I am trying to implement some CA queries into the server to get
> some parameters from another server. Therefore I used the little example
> 'myClient' (as I used 'myServer' for the Server tasks), and this
> compiles pretty fine but gets no connection to the Parameter Server
> while the same code compiled with Linux does exactly what I expected it
> to do.
> 
> The error messages are
> 
> CA.Client.Diagnostic..............................................
>     Message: "The search request/beacon address list was empty after
> initialization"
>     Severity: Warning
>     Source File: ../iocinf.c Line Number: 772
> ..................................................................
> bin/LynxOS/daq_seb_cas<warning>: Cannot switch to asyncronous mode:
> Error number not set
> bin/LynxOS/daq_seb_cas<    err>: Do not receive value of
> HAD:PARAM:HERAKLES:CRATE_ID: Error number not set
> 
> pretty similar to the ones ca_test supplied:
> 
> 
> CA.Client.Diagnostic..............................................
>     Message: "The search request/beacon address list was empty after
> initialization"
>     Severity: Warning
>     Source File: ../iocinf.c Line Number: 772
> ..................................................................
> Not Found HAD:PARAM:HERAKLES:CRATE_ID
> 
> I made some minor changes to the sources in the base/src/ca tree because
> LynxOS needs another way to find out it's own IP-address. Here's an
> extract of the function I supplied:
> 
> 
> > #ifdef LynxOS
> > 
> > #include <stdio.h>
> > #include <string.h>
> > 
> > #include <sys/utsname.h>
> > #include <netdb.h>
> > 
> > char *getIfAddr(char *ip) {
> >       struct utsname nameS, *name = &nameS;
> >       struct hostent entryS, *entry = &entryS;
> >       unsigned char first, second, third, fourth;
> > 
> >       uname(name);
> >       entry = gethostbyname(name->nodename);
> >       first = *(entry->h_addr);
> >       second = *((entry->h_addr) + 1);
> >       third = *((entry->h_addr) + 2);
> >       fourth = *((entry->h_addr) + 3);
> >       sprintf(ip,"%d.%d.%d.%d", first, second, third, fourth);
> >       return ip;
> > }
> > 
> > #endif
> 62a86
> >       char                            myownifaddr[16];
> 94c118,123
> < #ifndef LynxOS
> ---
> > #ifdef LynxOS
> >       getIfAddr(myownifaddr);
> >       init = TRUE;
> >       addr.sin_family = AF_INET;
> >       addr.sin_addr.s_addr = inet_addr(myownifaddr);
> > #else
> 144,148d172
> < #endif
> 
> I am using Version R3.13.2 of the EPICS base package.
> 
> Is anybody out there who has experience with the CA client lib under
> LynxOS.
> 
> Thank You for any comments
> 
> Benjamin 
> 
> -- 
> *****************************************************************
> Benjamin Sailer
> eMail: [email protected]
> *****************************************************************
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> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System