On Wed, Jul 16, 2014 at 11:01:58AM +0200, Werner Fink wrote:
> Hi,
>
> with the following lines the ksh93u upto ksh93v- 2014-06-25 do hang:
>
> dd if=/dev/zero of=testfile.txt bs=1 count=65537
> x=`cat testfile.txt | cat -`
>
> ... it works with count=65536 and/or
>
> x=$(cat testfile.txt | cat -)
>
> but AFAIK the backticks are very common and also supported.
>
> Btw: Even a Ctrl-C does *not* interrupt the running ksh:
>
> noether:~ # strace -p 31289
> Process 31289 attached - interrupt to quit
> write(1, "\0", 1) = ? ERESTARTSYS (To be restarted)
> --- {si_signo=SIGINT, si_code=SI_KERNEL, si_value={int=1060230178,
> ptr=0x7f943f31d422}} (Interrupt) ---
> rt_sigreturn(0x7d6ef8) = -1 EINTR (Interrupted system call)
> write(1, "\0", 1) = ? ERESTARTSYS (To be restarted)
After debugging I found that the following change
---------------------------* snip *---------------------------------------
--- ksh93/src/cmd/ksh93/sh/macro.c
+++ ksh93/src/cmd/ksh93/sh/macro.c 2014-07-18 13:50:47.590235743 +0000
@@ -2198,7 +2198,7 @@ static void comsubst(Mac_t *mp,register
mp->shp->inlineno = error_info.line+mp->shp->st.firstline;
t = (Shnode_t*)sh_parse(mp->shp, sp,SH_EOF|SH_NL);
mp->shp->inlineno = c;
- type = 1;
+ type = 3;
}
#if KSHELL
if(t)
---------------------------* snap *---------------------------------------
would fix the problem. The question rises if this will cause other
problems? AFAICS this causes that the subshell is using SH_PIPEFAIL
and a smaller buffer for stdout as well as does not wait on the job.
Werner
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