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Re: Any comment on file descriptor behavior in functions?
- X-seq: zsh-workers 21064
- From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: Re: Any comment on file descriptor behavior in functions?
- Date: Sat, 26 Mar 2005 17:05:15 +0000
- In-reply-to: <200503221831.j2MIVI09014962@xxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <1050321002236.ZM10916@xxxxxxxxxxxxxxxxxxxxxxx> <200503221404.j2ME41EL009572@xxxxxxxxxxxxxx> <1050322171125.ZM13668@xxxxxxxxxxxxxxxxxxxxxxx> <200503221831.j2MIVI09014962@xxxxxxxxxxxxxx>
Finally got a chance to apply this patch and try it. Looks good.
On Mar 22, 6:31pm, Peter Stephenson wrote:
}
} Bart Schaefer wrote:
} > That's not it, or rather it's too much of it. That also leaves open the
} > xtrace output descriptor, etc. The fix needs to be more specific.
}
} (I can't see any evidence for ", etc.", but I presume you just didn't
} perform an exhaustive search.)
Correct; I'm sorry.
} As far as I can see, when entering a function the values for process
} subsitutions would be incremented so that both types would be closed for
} an external program, but on a nested function they'd both be incremented
} further so they wouldn't.
Yes, I concur. What I can't figure out is why they need to be incremented
at all? Why not just assign them the do-not-close value to begin with?
Something having to do with them persisting for only one command?
Appended is a suggested test entry. While writing this, I noticed that
the first process substitution test relies on the 'cut' and 'paste'
external commands. I guess there's never been a problem with that, but
I wasn't aware they were both supported on all platforms where zsh has
been compiled.
Index: Test/D03procsubst.ztst
===================================================================
retrieving revision 1.3
diff -c -r1.3 D03procsubst.ztst
--- Test/D03procsubst.ztst 23 Sep 2003 15:27:17 -0000 1.3
+++ Test/D03procsubst.ztst 26 Mar 2005 17:02:51 -0000
@@ -12,6 +12,8 @@
true
fi
+ function copycat { cat "$@" }
+
%test
paste <(cut -f1 FILE1) <(cut -f3 FILE2)
0:<(...) substitution
@@ -29,3 +31,8 @@
>< First Second Third Fourth
>---
>> Erste Zweite Dritte Vierte
+
+ copycat <(print First) <(print Zweite)
+0:FDs remain open for external commands called from functions
+>First
+>Zweite
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