mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-29 08:29:54 +02:00
Chet Ramey
47 lines
2.2 KiB
Plaintext
47 lines
2.2 KiB
Plaintext
From chet@odin.INS.CWRU.Edu Sat Apr 27 19:54:13 1991
|
|
Flags: 50
|
|
Received: from odin.INS.CWRU.Edu by usenet.INS.CWRU.Edu with SMTP (5.65b+ida+/CWRU-1.5-UUCPGW)
|
|
id AA05700; Sat, 27 Apr 91 19:54:13 -0400 (from chet@odin.INS.CWRU.Edu for /usr/local/bin/m2mbox /usr/homes/chet/mbox)
|
|
Received: by odin.INS.CWRU.Edu (5.65b+ida+/CWRU-1.4-ins)
|
|
id AA17732; Sat, 27 Apr 91 19:54:06 -0400 (from chet for chet@usenet.INS.CWRU.Edu)
|
|
Date: Sat, 27 Apr 91 19:31:16 -0400
|
|
From: Chet Ramey <chet@odin.INS.CWRU.Edu>
|
|
To: bfox@ai.mit.edu
|
|
Subject: Re: [pedz@aixwiz.austin.ibm.com: fd 9 left open bug]
|
|
Cc: chet@odin.INS.CWRU.Edu, pedz@aixwiz.austin.ibm.com
|
|
Reply-To: chet@po.CWRU.Edu
|
|
In-Reply-To: Message from bfox@bears.ece.ucsb.edu of Wed, 24 Apr 91 12:49:33 PDT
|
|
Message-Id: <9104272331.AA17706.SM@odin.INS.CWRU.Edu>
|
|
Read-Receipt-To: chet@po.CWRU.Edu
|
|
|
|
> Below is something I call Xemacs which goes across the net, sets up the
|
|
> display variable and then kicks off emacs in such a way that rshd
|
|
> terminates. The trick is that the shell must die and all file
|
|
> descriptors going back to rshd must be closed. The same basic script
|
|
> works with csh but I had to add in the "9>&-" part at the end to make
|
|
> it work with bash. This is because somehow, file descriptor 9 is left
|
|
> open and I guess it must be a dup of stdin, stdout, or stderr.
|
|
|
|
This is a bug alright, but it's a bug with rshd that's not fixed until
|
|
4.3-reno.
|
|
|
|
rshd sets up a pipe (int pv[2]; if you have the source to the tahoe rshd)
|
|
to the process it executes and uses it to manage error and control output
|
|
from over the net. In the child process, it does a dup2(pv[1], 2), but
|
|
never calls close(pv[1]). Adding that code to the 4.3-tahoe rshd makes it
|
|
(and the Xemacs script) work right.
|
|
|
|
I don't know how to solve this cleanly in bash. Doing a blanket close of
|
|
all open file descriptors < 2, < 20 is a no-no, especially when we're not
|
|
interactive. csh `works' because it does the blanket close on startup, but
|
|
csh can get away with doing that because it doesn't let you manipulate
|
|
arbitrary file descriptors.
|
|
|
|
Chet
|
|
|
|
--
|
|
Chet Ramey Internet: chet@po.CWRU.Edu
|
|
Case Western Reserve University NeXT Mail: chet@macbeth.INS.CWRU.Edu
|
|
|
|
``Now, somehow we've brought our sins back physically -- and they're pissed.''
|