Re: Any comment on file descriptor behavior in functions?

[Peter Stephenson <pws@xxxxxxx>]

Bart Schaefer wrote:
> Specifically zsh-workers/20991:
> 
> > It could be argued that descriptors opened by process substitution
> > should remain open across external command execution within functions;
> > they do, in e.g. bash.
> 
> (But don't in zsh, in case that isn't clear.)

Is this it?  Does it have other effects?

Index: Src/exec.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/exec.c,v
retrieving revision 1.84
diff -u -r1.84 exec.c
--- Src/exec.c	6 Feb 2005 20:36:42 -0000	1.84
+++ Src/exec.c	22 Mar 2005 13:55:17 -0000
@@ -496,7 +496,13 @@
     }
 
     argv = makecline(args);
-    closem(3);
+    /*
+     * At this point we used to:
+     *   closem(3);
+     * which had the effect of closing file descriptors opened
+     * for process substitution.  However, experience suggests
+     * it's better to leave these open for other processes to use.
+     */
     child_unblock();
     if ((int) strlen(arg0) >= PATH_MAX) {
 	zerr("command too long: %s", arg0, 0);

-- 
Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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