Re: [RFC][PATCH] scripts with stdin replaced

allbery@kf8nh.apk.net
Sun, 4 Jul 1999 10:14:31 -0400 (EDT)

On 4 Jul, Richard Guenther wrote:
+-----
| On Sat, 3 Jul 1999, Marcin 'Qrczak' Kowalczyk wrote:
| > > The following patch extends binfmt_misc to substitute stdin
| > > of the wrapper with the to be executed binary.
| >
| > Wouldn't be better to open it on a different descriptor and pass
| > /dev/fd/<something> (or /proc/<pid>/fd/<something> - BTW, which one is
| > preferred to use?) as the argument? I think that some Unices do that.
|
| Do you know which Unices offer such feature and which semantics they
| choose? I have couple of different machines around, but before
+--->8

I don't know of any others that provide general binfmt_misc-type
functionality (nb. that doesn't mean they don't exist!), but many modern
Unixes that support basic #! capability secure it by passing /dev/fd/n
as the argument to avoid a race condition. Solaris (2.5+) is one such.

-- 
brandon s. allbery	[os/2][linux][solaris][japh]	 allbery@kf8nh.apk.net
system administrator	     [WAY too many hats]	   allbery@ece.cmu.edu
carnegie mellon / electrical and computer engineering			 KF8NH
     We are Linux. Resistance is an indication that you missed the point.




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