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:
From 2839760066e578e449ebc8b3d71297b9f79a8c99
From: cinap_lenrek
Date: Sat, 08 Sep 2018 12:49:00 +
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 = >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*);
inttruestatus(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
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