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Re: zsh-2.6beta20 doesn't compile under Linux pre2.0.14
- X-seq: zsh-users 245
- From: Steven L Baur <steve@xxxxxxxxxxxx>
- To: zsh-users@xxxxxxxxxxxxxxx
- Subject: Re: zsh-2.6beta20 doesn't compile under Linux pre2.0.14
- Date: 10 Jun 1996 10:39:38 -0700
- In-reply-to: Zoltan Hidvegi's message of 10 Jun 1996 10:03:16 -0700
- Mail-copies-to: never
- References: <199606101703.TAA05789@xxxxxxxxxxxxxxxxx>
- Sender: steve@xxxxxxxxxxxx
>>>>> "Zoltan" == Zoltan Hidvegi <hzoli@xxxxxxxxxx> writes:
(Your patch produces a compilable zsh on Linux 2.0, thanks).
Zoltan> It is surprising that the there days before the final 2.0
Zoltan> release a new feature appeared. Here is the patch. I think
Zoltan> zsh will be the first shell which can set this new limit.
Zoltan> There is no patch to the manual simply because I do not know
Zoltan> what is this limit. Also a new flag should be inveted to set
Zoltan> this limit with ulimit.
It's related to the problem found recently where ``grep x /dev/zero''
would crash the system. I don't believe it does anything, at least I
haven't found any code via grep in the kernel source that does
anything with it.
Zoltan> Please tell me your suggestions.
Here's the only authoritative information about it I'm aware of:
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Date: Fri, 7 Jun 1996 09:22:26 +0300 (EET DST)
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxx>
To: Michael Meskes <meskes@xxxxxxxxxxxxxxxxxxxxxxxxx>
cc: Linux-Kernel Mailinglist <linux-kernel@xxxxxxxxxxxxxxxx>
Subject: Re: the mmap() problem, a'la "grep x /dev/zero"
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Xref: deanna.miranova.com linux-kernel:1385
On Fri, 7 Jun 1996, Michael Meskes wrote:
> circe:meskes 105) grep x /dev/zero
> grep: memory exhausted
Umm, this looks ok - that's what supposed to happen. Linux can't fix the
fact that grep doesn't work well on /dev/null (or any file that is that
huge), but at least the above isn't a crash..
> It allocated much more memory than it should. I had a limit of 4MB, but the
> size went up to 12MB (5MB resident).
Umm, _what_ size? If you set a RLIMIT_DATA (or whatever the name is),
that will only make a difference for the process bss (*), and if grep
uses mmap(), then we'd need to have a "virtual memory" limit. However, we
don't have any such limit, although I added a RLIMIT_AS for 2.0 (but it's
(*) that's the curent Linux interpretation, at least. Do other unixes
consider mmap'ed data part of RLIMIT_DATA?
> Also I was able to run the memtest
> program on 8MB despite datasize limited to 1MB. Hmm I have to check the
> sources to see what happened. And my program with a global definition of
> 'char a[128MB]' still dumpos core.
Well, dumping core is the corect thing to do - it failed to get the BSS
at exec time, so when the program actually ran it was "kind of" unhappy..
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