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Re: [gpsd-dev] Does shared memory segment ever get destroyed ?
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From: |
Gary E. Miller |
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Subject: |
Re: [gpsd-dev] Does shared memory segment ever get destroyed ? |
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Date: |
Fri, 4 Nov 2011 15:51:40 -0700 (PDT) |
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User-agent: |
Alpine 1.00 (LNX 882 2007-12-20) |
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Yo YuFen!
On Fri, 4 Nov 2011, Yufeng Shen wrote:
> Looks like shm_release() only detach from the shared memory segment.
Correct, that is the ntpd protocol. gpsd did not write that, we just
do what ntpd wants us to do.
> Otherwise when the gpsd is killed, the client can still attach to the
> leftover shared memory segment and read old data from it.
Nope, the ntpd protocol has a nice handshake to prevent that.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
address@hidden Tel:+1(541)382-8588
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