From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ee9e417a05021012584cb31c4f@mail.gmail.com>
Date: Thu, 10 Feb 2005 15:58:24 -0500
From: Russ Cox <russcox@gmail.com>
To: David Leimbach <leimy2k@gmail.com>
Subject: Re: [9fans] off-topic linux threading bug complaint
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	<3e1162e6050210123332be7add@mail.gmail.com>
Cc: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
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> I tried it on solaris:
>
> sultan% ps -p 1362 -o "lwp user pid ppid taskid pcpu pmem fname"
>    LWP     USER   PID  PPID TASKID %CPU %MEM COMMAND
>      1     dave  1362  1354    59    -  0.1 <defunct>
>      2     dave  1362  1354    59  0.0  0.1 x
>
> 2 Light Weight processes, one of which is defunct.  Sounds similar to
> the linux behavior.

The Linux behavior -- that ps is misleading and gdb is unusable unless
you have some magic guess as to some other "pid" -- is broken.

SunOS is not broken this way: ps shows a non-zombie
process, and the debugger can attach to it.

% ./a.out &
[3] 12058
% ps -aA -o 'user,pid,stime,time,rss,s,args'  | grep a.out
     rsc 12058 15:55:40        0:00  920 S ./a.out
% adb a.out
:A 12058
$c
libc.so.1`_libc_nanosleep+4(3e8, ff350234, 0, 0, 0, 0)
sleeper+0xc(0, 0, 0, 0, 0, 0)
libthread.so.1`_lwp_start(0, 0, 0, 0, 0, 0)
^D
%

Russ