From: Jan Stancek <jstancek@redhat.com>
To: gaowanlong@cn.fujitsu.com
Cc: ltp-list@lists.sourceforge.net
Subject: Re: [LTP] Regarding shmat01 syscall test
Date: Wed, 24 Oct 2012 02:43:08 -0400 (EDT) [thread overview]
Message-ID: <953803847.5389852.1351060988163.JavaMail.root@redhat.com> (raw)
In-Reply-To: <50873A3B.3030209@cn.fujitsu.com>
----- Original Message -----
> From: "Wanlong Gao" <gaowanlong@cn.fujitsu.com>
> To: "Om Prakash PAL" <omprakash.pal@stericsson.com>
> Cc: ltp-list@lists.sourceforge.net
> Sent: Wednesday, 24 October, 2012 2:45:47 AM
> Subject: Re: [LTP] Regarding shmat01 syscall test
>
> On 10/23/2012 06:05 PM, Om Prakash PAL wrote:
> >
> >
> > -----Original Message-----
> > From: Wanlong Gao [mailto:gaowanlong@cn.fujitsu.com]
> > Sent: Tuesday, October 23, 2012 3:07 PM
> > To: Om Prakash PAL
> > Cc: ltp-list@lists.sourceforge.net
> > Subject: Re: [LTP] Regarding shmat01 syscall test
> >
> > On 10/23/2012 05:24 PM, Om Prakash PAL wrote:
> >> Hi,
> >>
> >> I am working on syscall test: shmat01.c
> >>
> >> I have some confusion:
> >>
> >>
> >>
> >> In setup() : it is allocating shared memory by shmget() and then
> >> attaching by shmat() and after that detaching the attached
> >> address (i.e. shmdt())
> >>
> >>
> >>
> >> if (shmdt((const void *)base_addr) == -1) {
> >>
> >> tst_brkm(TBROK, cleanup, "Couldn't detach shared
> >> memory");
> >>
> >> }
> >>
> >>
> >>
> >> And again in main function it is using same "base_addr" as
> >> attaching address,
> >>
> >>
> >>
> >> addr = shmat(*(TC[i].shmid), base_addr+TC[i].offset,
> >>
> >> TC[i].flags);
> >>
> >> how can we ensure(100%) that base_addr (virtual) will be free till
> >> this point for attaching?.
> >
> > Maybe we can't, but I didn't see any fail on this. Did you see any
> > testing failure here?
> >
> > Yes, I got some failure and the reason of failure is : the address
> > at which we want to attach is busy.
>
> OK, please feel free to send a patch, or can you tell us how to
> reproduce it?
I recall I could reproduce it, if I added single printf:
http://article.gmane.org/gmane.linux.ltp/16480
Regards,
Jan
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next prev parent reply other threads:[~2012-10-24 6:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-23 9:24 [LTP] Regarding shmat01 syscall test Om Prakash PAL
2012-10-23 9:37 ` Wanlong Gao
2012-10-23 10:05 ` Om Prakash PAL
2012-10-24 0:45 ` Wanlong Gao
2012-10-24 6:43 ` Jan Stancek [this message]
2012-10-24 7:03 ` Wanlong Gao
2012-10-24 7:49 ` Jan Stancek
2012-10-24 7:51 ` Wanlong Gao
2012-10-24 8:20 ` Jan Stancek
2012-10-26 1:45 ` Wanlong Gao
2012-10-26 8:01 ` Jan Stancek
2012-10-26 8:03 ` Wanlong Gao
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