On 10/23/2012 06:05 PM, Om Prakash PAL wrote: > > > -----Original Message----- > From: Wanlong Gao [mailto:[email protected]] > Sent: Tuesday, October 23, 2012 3:07 PM > To: Om Prakash PAL > Cc: [email protected] > 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? Thanks, Wanlong Gao > > Best Regards, > Om Prakash Pal > > > > 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 >> >> >> >> ------------------------------------------------------------------------------ >> Everyone hates slow websites. So do we. >> Make your web apps faster with AppDynamics >> Download AppDynamics Lite for free today: >> http://p.sf.net/sfu/appdyn_sfd2d_oct >> >> >> >> _______________________________________________ >> Ltp-list mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/ltp-list >> > > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Ltp-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ltp-list
