Re: Piping sed stalls on OpenSolaris 2010.03

[Mats Erik Andersson]

fredag den 13 april 2012 klockan 07:59 skrev Paul Eggert detta:
> On 04/13/2012 03:32 AM, Mats Erik Andersson wrote:
> >     { echo "A comment";
> >       sed -e 's,re,txt,g' < file |
> >       sed -e 's,re2,txt2,g' |
> >       sed -e 's,re3,txt3,g'; } > outfile
> > 
> > All other modules implement pipes using one or two levels, not three.
> > This three level construct stalls on OpenSolaris 2010.03, presumably
> > waiting for input
> 
> This sounds like a serious bug with OpenSolaris.
> But perhaps it is a bug in the script.

The relevant trace part is the one given below.
Prior to the this "/usr/gnu/bin/sed", i.e., "/usr/bin/gsed"
has been put to work, using ksh93 and gmake. Same "brk" lines
were removed, and my identification of I/O has been inserted.
I find this inconclusive, except that the expected write(2)
never appears.

Best regards,
  Mats E A


   MEA: Comments as made by Mats Erik Andersson

14115:  write(1, " o s e ,   " c l o s e  ".., 5120)    = 5120
   MEA: Writing for line 299, lib/unistd.in.h
14115:  read(0, " r   f o r   p o r t a b".., 4096)     = 4096
   MEA: Reading from line 243 or 481, lib/unistd.in.h
14115:  read(0, " E T C W D\n _ G L _ W A".., 4096)     = 4096
   MEA: Reading from line 598, lib/unistd.in.h
14115:  write(1, " o i d   _ g l _ u n r e".., 5120)    = 5120
   MEA: Writing for line 466, lib/unistd.in.h
14115:  read(0, " c a s t ,   b e c a u s".., 4096)     = 4096
   MEA: Reading from line 708 or later, lib/unistd.in.h
14054:  waitid(P_ALL, 0, 0x08046B70, WEXITED|WTRAPPED) (sleeping...)
14077:  waitid(P_ALL, 0, 0x08046AE0, WEXITED|WTRAPPED) (sleeping...)
14099:  waitid(P_ALL, 0, 0x08045070, WEXITED|WTRAPPED|WSTOPPED|WCONTINUED) 
(sleeping...)
14107:  waitid(P_ALL, 0, 0x08044310, WEXITED|WTRAPPED|WSTOPPED|WCONTINUED) 
(sleeping...)
14109:  waitid(P_ALL, 0, 0x080469C0, WEXITED|WTRAPPED) (sleeping...)
14117:  read(0, 0xFEF6AFD8, 1024)       (sleeping...)
14119:  read(0, 0x0809991C, 5120)       (sleeping...)
14111:  waitid(P_ALL, 0, 0x08042B50, WEXITED|WTRAPPED|WSTOPPED|WCONTINUED) 
(sleeping...)
14115:  write(1, 0x080A462C, 5120)      (sleeping...)
14119:      Received signal #2, SIGINT, in read() [default]
14119:  read(0, 0x0809991C, 5120)                       Err#4 EINTR
14109:      Received signal #2, SIGINT, in waitid() [caught]
14109:  waitid(P_ALL, 0, 0x080469C0, WEXITED|WTRAPPED)  Err#91 ERESTART
14109:  lwp_sigmask(SIG_SETMASK, 0x00000002, 0x00000000) = 0xFFBFFEFF 
[0x0000FFFF]