Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Thu, 24 Aug 2006 09:46:28 -0600

David,

Currently we have needed only these two versions.

libCom/osi/os/default/osdNetIntf.c
libCom/osi/os/win32/osdNetIntf.c

Currently all of the UNIX systems have found the default version to be
sufficient after allowing for some small os dependent variations in the
implementation of ifreq_size().

> On NetBSD, this function returns information that is "inconsistent" with
> Linux, I believe.

As I understand it Darwin (MAC OSX) is working fine with the default
osdNetIntf.c but it does need the more advanced implementation of
ifreq_size(). Be careful to have a look at the two variants of ifreq_size()
and make certain that a proper implementation is selected for NetBSD. If
ifreq_size() was wrong you might see complete garbage in the returned
structures.

This is the default:
epics\base\src\libCom\osi\os\alpha\osdSock.h(70):
#define ifreq_size(pifreq) (sizeof(pifreq->ifr_name))

Here is Darwin (probably the closest relative of NetBSD supported so far):
epics\base\src\libCom\osi\os\Darwin\osdSock.h(80):
#define ifreq_size(pifreq) ((pifreq)->ifr_addr.sa_len +
sizeof((pifreq)->ifr_name))

Linux:
epics\base\src\libCom\osi\os\Linux\osdSock.h(93):
#define ifreq_size(pifreq) (sizeof(pifreq->ifr_name))

Nevertheless, the source is organized so that you could easily provide an
osdNetIntf.c override in libCom/osi/os/NetBSD based on getifaddrs should
that prove to be necessary. 

An implementation based on getifaddrs might be useful but perhaps not yet a
portability bullet as it is not in, for example, my latest vxWorks at hand
(vxWorks 5.4) nor in http://www.opengroup.org/pubs/online/7908799/.

Jeff

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System