Re: Zsh 4.3.12: subshell in midnight commander: precmd: 15: bad file descriptor

[Peter Stephenson <Peter.Stephenson@csr.com>]

On Mon, 18 Jul 2011 07:45:51 -0700
Bart Schaefer <schaefer@brasslantern.com> wrote:
> So it's the calling shell rather than the called shell that is closing
> a descriptor that it shouldn't.

I don't think so: both lsof and sh -c 'pwd >&11' agree that the FD is
still open in the lower shell.

See if this fixes it.

Index: Src/exec.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/exec.c,v
retrieving revision 1.198
diff -p -u -r1.198 exec.c
--- Src/exec.c	23 Jun 2011 19:29:24 -0000	1.198
+++ Src/exec.c	18 Jul 2011 15:20:29 -0000
@@ -3008,11 +3008,17 @@ execcmd(Estate state, int input, int out
 		if (!checkclobberparam(fn))
 		    fil = -1;
 		else if (fn->fd2 > 9 &&
-			 (fn->fd2 > max_zsh_fd ||
-			  (fdtable[fn->fd2] != FDT_UNUSED &&
-			   fdtable[fn->fd2] != FDT_EXTERNAL) ||
-			  fn->fd2 == coprocin ||
-			  fn->fd2 == coprocout)) {
+			 /*
+			  * If the requested fd is > max_zsh_fd,
+			  * the shell doesn't know about it.
+			  * Just assume the user knows what they're
+			  * doing.
+			  */
+			 (fn->fd2 <= max_zsh_fd &&
+			  ((fdtable[fn->fd2] != FDT_UNUSED &&
+			    fdtable[fn->fd2] != FDT_EXTERNAL) ||
+			   fn->fd2 == coprocin ||
+			   fn->fd2 == coprocout))) {
 		    fil = -1;
 		    errno = EBADF;
 		} else {

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
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