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On Fri, Nov 08, 2002 at 05:19:18PM +0100, Corinna Vinschen wrote: >> 2) I thought that the passwd/group files where only >> read "for the first cygwin process that start up >> on a given console", to use Chris' words in >> http://cygwin.com/ml/cygwin-patches/2002-q4/msg00024.html > >I discussed this with Chris in innumerable one-on-ones but we >never found a satisfactory solution for keeping the data just >once in memory. I can't reiterate right away but every new >idea had a flaw. I'm still at times thinking about something >with shared memory but there are as usual security concerns. Right. I overstated things a little. A newly execed process needs to read /etc/passwd in some cases, iirc. That's because the passwd info is not in the cygheap. I made some changes once to put the passwd info in the cygheap so that all processes share the info but iirc it actually slowed things down. >> In fact applications such as sshd would benefit from >> rereading the files (if needed) *before* forks or execs, >> so that a single reread can serve all future children, >> but that approach does not help with thread issues. > >I don't think it's worth the effort. The main reason is that >changes to passwd and group files are so seldom... I agree. How often does /etc/passwd change? cgf
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