|Subject: Re: Bug#367584: nmap man pages maybe warn of breaking /dev/stdin
^^^
you mean mmap of course
On Wed, May 17, 2006 at 05:33:32AM +0800, Dan Jacobson wrote:
> Package: manpages-dev
> Version: 2.25-3
> Severity: minor
>
> Maybe the mmap man pages should warn that this messes things like
> Bug#367297: dpkg --merge-avail /dev/stdin doesn't work
> > # ssh ...|dpkg --merge-avail /dev/stdin
> > Updating available packages info, using /dev/stdin.
> > Information about 0 package(s) was updated.
> I guess this happens because we open the file with mmap.
> Support for reading the available data from stdin would probably have to
> be added seperatly.
> up, or maybe this is all over my head.
This probably fails because pipes aren't seekable; could you strace
the process and report what happens between the open /dev/stdin and
close of that fd? Why do you suggest that it is mmaped, anyway? I
see this:
|open64("/dev/stdin", 0, 01007404334) = 4
|malloc(44) = 0x812a120
|__fxstat64(3, 4, 0xbfdadd68) = 0
|memset(0xbfdadcf4, '\000', 116) = 0xbfdadcf4
|free(0x812a120) = <void>
|free(NULL) = <void>
|close(4) = 0
... |strace dpkg --merge-avail /dev/stdin 2>&1 |less
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