From: ori@eigenstate.org
To: 9fans@9fans.net
Subject: Re: [9fans] rc: <{command} and > mess with exit status
Date: Wed, 16 Jun 2021 10:04:28 -0400 [thread overview]
Message-ID: <49B486395284791D8478ECE45D844F7F@eigenstate.org> (raw)
In-Reply-To: <YMnBv1sps4qZRPJr@SDF.ORG>
Quoth adr via 9fans <9fans@9fans.net>:
> ; if(grep a <{echo a}) echo true
> a
> true
>
> ; if(echo a | grep a >/tmp/1) echo true
> true
>
> But now:
> ; if(grep a <{echo a} >/tmp/1) echo true
> ;
>
> Is this expected?
It's been fixed. Here's the patch:
<git/export 2839760066e578e449ebc8b3d71297b9f79a8c99
From 2839760066e578e449ebc8b3d71297b9f79a8c99
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sat, 08 Sep 2018 12:49:00 +0000
Subject: [PATCH] rc: fix Xpipefd unbalancing the redir stack
Xpipefd wants the pipe descriptor to be closed in turfredir(), so
it pushes the redirection, but this breaks Xpopredir after normal
redirection. so we shuffle the Xpipefd redir to the bottom of the
stack.
---
diff 217e8a06198cf6681fb0c38c26f34d96ae4302f6 2839760066e578e449ebc8b3d71297b9f79a8c99
--- a/sys/src/cmd/rc/exec.c Mon Sep 3 16:37:45 2018
+++ b/sys/src/cmd/rc/exec.c Sat Sep 8 08:49:00 2018
@@ -123,6 +123,21 @@
runq->redir = rp;
}
+void
+shuffleredir(void)
+{
+ redir **rr, *rp;
+
+ rp = runq->redir;
+ if(rp==0)
+ return;
+ runq->redir = rp->next;
+ rp->next = runq->startredir;
+ for(rr = &runq->redir; *rr != rp->next; rr = &((*rr)->next))
+ ;
+ *rr = rp;
+}
+
var*
newvar(char *name, var *next)
{
--- a/sys/src/cmd/rc/fns.h Mon Sep 3 16:37:45 2018
+++ b/sys/src/cmd/rc/fns.h Sat Sep 8 08:49:00 2018
@@ -55,6 +55,7 @@
word* searchpath(char*);
void setstatus(char*);
void setvar(char*, word*);
+void shuffleredir(void);
void skipnl(void);
void start(code*, int, var*);
int truestatus(void);
--- a/sys/src/cmd/rc/havefork.c Mon Sep 3 16:37:45 2018
+++ b/sys/src/cmd/rc/havefork.c Sat Sep 8 08:49:00 2018
@@ -185,7 +185,8 @@
default:
addwaitpid(pid);
close(sidefd);
- pushredir(ROPEN, mainfd, mainfd); /* isn't this a noop? */
+ pushredir(ROPEN, mainfd, mainfd);
+ shuffleredir(); /* shuffle redir to bottom of stack for turfredir() */
strcpy(name, Fdprefix);
inttoascii(name+strlen(name), mainfd);
pushword(name);
@{
bind -ac /dist/plan9front/ /
git/export 2839760066e578e449ebc8b3d71297b9f79a8c99
}
------------------------------------------
9fans: 9fans
Permalink: https://9fans.topicbox.com/groups/9fans/Tad6cf6b7414c1847-M3410604626038f5a31ffaf9f
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next prev parent reply other threads:[~2021-06-16 14:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 9:17 adr via 9fans
2021-06-16 9:20 ` Sigrid Solveig Haflínudóttir
2021-06-16 10:42 ` adr via 9fans
2021-06-16 10:42 ` [9fans] " Anthony Martin
2021-06-16 14:04 ` ori [this message]
2021-06-16 19:27 ` [9fans] " adr via 9fans
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