* [9fans] rc: <{command} and > mess with exit status
@ 2021-06-16 9:17 adr via 9fans
2021-06-16 9:20 ` Sigrid Solveig Haflínudóttir
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: adr via 9fans @ 2021-06-16 9:17 UTC (permalink / raw)
To: 9fans
; 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?
Regards,
adr.
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* Re: [9fans] rc: <{command} and > mess with exit status
2021-06-16 9:17 [9fans] rc: <{command} and > mess with exit status 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 ` [9fans] " ori
2 siblings, 1 reply; 6+ messages in thread
From: Sigrid Solveig HaflÃnudóttir @ 2021-06-16 9:20 UTC (permalink / raw)
To: 9fans
; if(grep a <{echo a}) echo true
a
true
; if(echo a | grep a >/tmp/1) echo true
true
; if(grep a <{echo a} >/tmp/1) echo true
true
9front.
------------------------------------------
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* [9fans] Re: rc: <{command} and > mess with exit status
2021-06-16 9:17 [9fans] rc: <{command} and > mess with exit status adr via 9fans
2021-06-16 9:20 ` Sigrid Solveig Haflínudóttir
@ 2021-06-16 10:42 ` Anthony Martin
2021-06-16 14:04 ` [9fans] " ori
2 siblings, 0 replies; 6+ messages in thread
From: Anthony Martin @ 2021-06-16 10:42 UTC (permalink / raw)
To: 9fans
adr via 9fans <9fans@9fans.net> once said:
> ; if(grep a <{echo a} >/tmp/1) echo true
> ;
>
> Is this expected?
This was fixed a few years ago in 9front:
http://git.9front.org/plan9front/plan9front/2839760066e578e449ebc8b3d71297b9f79a8c99/commit.html
Cheers,
Anthony
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* Re: [9fans] rc: <{command} and > mess with exit status
2021-06-16 9:20 ` Sigrid Solveig Haflínudóttir
@ 2021-06-16 10:42 ` adr via 9fans
0 siblings, 0 replies; 6+ messages in thread
From: adr via 9fans @ 2021-06-16 10:42 UTC (permalink / raw)
To: 9fans
Thanks, it looks like a bug.
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* Re: [9fans] rc: <{command} and > mess with exit status
2021-06-16 9:17 [9fans] rc: <{command} and > mess with exit status adr via 9fans
2021-06-16 9:20 ` Sigrid Solveig Haflínudóttir
2021-06-16 10:42 ` [9fans] " Anthony Martin
@ 2021-06-16 14:04 ` ori
2021-06-16 19:27 ` adr via 9fans
2 siblings, 1 reply; 6+ messages in thread
From: ori @ 2021-06-16 14:04 UTC (permalink / raw)
To: 9fans
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
}
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* Re: [9fans] rc: <{command} and > mess with exit status
2021-06-16 14:04 ` [9fans] " ori
@ 2021-06-16 19:27 ` adr via 9fans
0 siblings, 0 replies; 6+ messages in thread
From: adr via 9fans @ 2021-06-16 19:27 UTC (permalink / raw)
To: 9fans
Thanks for the patch!
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end of thread, other threads:[~2021-06-16 19:27 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-16 9:17 [9fans] rc: <{command} and > mess with exit status 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 ` [9fans] " ori
2021-06-16 19:27 ` adr via 9fans
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