From: Wanlong Gao <gaowanlong@cn.fujitsu.com>
To: Om Prakash PAL <omprakash.pal@stericsson.com>
Cc: "ltp-list@lists.sourceforge.net" <ltp-list@lists.sourceforge.net>
Subject: Re: [LTP] Regarding shmat01 syscall test
Date: Tue, 23 Oct 2012 17:37:18 +0800 [thread overview]
Message-ID: <5086654E.1010303@cn.fujitsu.com> (raw)
In-Reply-To: <3ED83A9DB3B6D94CA68BF7C03F2981D35D01C266B4@EXDCVYMBSTM006.EQ1STM.local>
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?
Thanks,
Wanlong Gao
>
> there is possibility that this address(base_addr) will be used, so in that case this shmat() will fail.
>
> Please correct me if I am wrong.
>
> Thanks in advance.
>
>
>
> Best Regards,
>
> Om Prakash Pal
>
>
>
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next prev parent reply other threads:[~2012-10-23 10:00 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 [this message]
2012-10-23 10:05 ` Om Prakash PAL
2012-10-24 0:45 ` Wanlong Gao
2012-10-24 6:43 ` Jan Stancek
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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