Re: fatal flaw zsh 4.0.1 on irix 6.3 & 6.5: suspend "ls -l|less" then resume hangs

[Timothy Miller <tsm@cs.brown.edu>]

On Tue, 12 Jun 2001 15:40:26 +0000, "Bart Schaefer" <schaefer@candle.brasslantern.com> wrote:
> On Jun 12, 11:00am, Timothy Miller wrote:
> }
> } I can't type fast enough to suspend cat before it exits!
> 
> Use "ls -lR / | cat" and I bet you'll have time.

Yes, I thought of something like that shortly after I sent the email...what
comes of sending too rapidly...anyway, if I do that, it hangs on the first
suspend.

irix 6.3, zsh 4.0.1 -f,  ls -lR /|cat, then suspend:

  F S      UID   PID  PPID  PGID   SID  C PRI NI  P    SZ:RSS      WCHAN    STIME TTY     TIME CMD
 b0 S      tsm 13962 13961 13962 13905  0  60 20  *   394:114   c06afbc0 11:55:29 ttyq13  0:01 ls -lR / 
 b0 T      tsm 13963 13961 13963 13905  0  60 20  *    45:25           - 11:55:29 ttyq13  0:00 cat 
 b0 S      tsm 13961 13905 13961 13905  0  39 20  *   732:297   8039d510 11:55:26 ttyq13  0:00 zsh-4.0.1 -f 

zsh asleep syscall 166, all sigs held but 1, 9, 18, 23
ls asleep on syscall 5, no sigs held/pending
cat stopped, no sigs held/pending

just found more authoritative info on syscall numbers; syscall 4 is read(),
syscall 5 is write(), syscall 166 is sigsuspend(), which makes much more
sense.
   Tim