Experimental Physics and Industrial Control System
Hi Till,
Till Straumann wrote:
I found the following problem (tested on
linux, solaris, base-3.14.9, base-3.14.8.2)
with the CA client on unix:
Partly confirmed on linux-x86 (Fedora-5) against R3.14.9 as follows:
uranus% cau
cau: get no_PV
**** The executable "caRepeater" couldn't be located
**** because of errno = "No such file or directory".
**** You may need to modify your PATH environment variable.
**** Unable to start "CA Repeater" process.
error on search for no_PV
couldn't open no_PV
cau:
While cau is still running, a ps from another terminal gives this:
uranus% ps -ef | grep cau
anj 1440 2430 0 09:45 pts/7 00:00:00 cau
anj 1444 1440 0 09:45 pts/7 00:00:00 [cau] <defunct>
anj 1446 2428 0 09:45 pts/6 00:00:00 grep cau
In my case though, the <defunct> process' parent is still the original
cau thread, and when the parent exits so does the defunct thread. Any
long-running CA client application should be usable to prove this.
In libCom/osi/os/posix we can fix the problem using Till's fix of having
osiSpawnDetachedProcess() call _exit() which is a Posix.1 routine. Both
vxWorks and RTEMS just return osiSpawnDetachedProcessNoSupport so
there's no issue there; the other implementations of
osiSpawnDetachedProcess() are for VMS and WIN32, neither of which call
exit().
Another problem though appears to be that at no point does the CA client
library actually fork off a caRepeater itself, even after this message
appears:
CA client library is unable to contact CA repeater after 50 tries.
Silence this message by starting a CA repeater daemon
or by calling ca_pend_event() and or ca_poll() more often.
I proved that as follows: With caRepeater running, I can find the
following output from netstat (NB: ca-2 is the IANA official name for
our port on recent OS releases; on older releases you may have to use
5065 instead - look in your /etc/services file to see whether you have
ca-1 and ca-2 defined):
uranus% netstat -a | grep 'ca-2'
udp 0 0 *:ca-2 *:*
With cau running as above there is no output from that command. Was
this functionality removed intentionally Jeff?
- Andrew
--
The right to be heard does not automatically include
the right to be taken seriously. -- Hubert H. Humphrey
- Replies:
- Re: CA client on unix bug Till Straumann
- References:
- CA client on unix bug Till Straumann
- Navigate by Date:
- Prev:
Linux PMAC PCI driver & device support available Philip Taylor
- Next:
RE: IK320 problem Shepherd, EL (Emma)
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
<2007>
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
CA client on unix bug Till Straumann
- Next:
Re: CA client on unix bug Till Straumann
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
<2007>
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024