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Mail Archives: cygwin/2001/10/03/06:26:32

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Message-ID: <3BBAE7B8.4567166E@iee.org>

Date: Wed, 03 Oct 2001 11:26:00 +0100

From: Don Sharp <dwsharp AT iee DOT org>

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To: Robert Legros <robert_legros AT yahoo DOT com>

CC: gnuwin32 <cygwin AT cygwin DOT com>

Subject: Re: 1.3.3-2: Process creation is possible with ppid = 0 and pgid = 0

References: <20011003090000 DOT 448 DOT qmail AT web11502 DOT mail DOT yahoo DOT com>


Robert Legros wrote:
> 
> Hello,
> 
> It is possible to create a Cygwin process whose ppid
> and pgid are both zero.
> 
> If you type the following commands at the shell
> command prompt (bash or ash) :
>         sh -c "sleep 10 &"
>         ps
> you will see a process whose PPID and PGID are 0.
> 

Yes you do but note that if the doublequote comes before the ampersand
the list is what you might expect.
 
$ sh -c " sleep 10" &
[1] 215

$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
      205       1     205        205  con 1000 09:28:07 /usr/bin/rxvt
       72     205      72        207    0 1000 09:28:07 /usr/bin/bash
      215      72     215        170    0 1000 11:17:35 /usr/bin/sh
      148     215     215        148    0 1000 11:17:35 /usr/bin/sleep
      224      72     224        229    0 1000 11:17:36 /usr/bin/ps


Hope that helps.

Don Sharp

> I really do suppose it was not meant to allow such a
> thing. Normally, a detached process should have ppid
> and pgid with value 1. That's what does occur when you
> type the following commands :
>         sleep 10 &
>         ps
> 
> Best Regards,
> 
> =====
> Robert Legros
> south Brussels, Belgium
> robert_legros AT yahoo DOT com
> 
> __________________________________________________
> Do You Yahoo!?
> Listen to your Yahoo! Mail messages from any phone.
> http://phone.yahoo.com
> 
>   ------------------------------------------------------------------------
> 
> Cygnus Win95/NT Configuration Diagnostics
> Current System Time: Tue Oct  2 15:43:23 2001
> 
> WinNT Ver 5.0 build 2195 Service Pack 1
> 
> Path:   /usr/local/bin
>         /usr/bin
>         /bin
>         /cygdrive/c/WINNT/system32
>         /cygdrive/c/WINNT
>         /cygdrive/c/WINNT/System32/Wbem
>         /cygdrive/c/Program Files/Symantec/pcAnywhere/
>         .
> 
> SysDir: C:\WINNT\System32
> WinDir: C:\WINNT
> 
> PWD = `/home/rleg/project/cygwin/bug_001'
> USER = `rleg'
> MAKE_MODE = `unix'
> HOME = `/home/rleg'
> 
> NUMBER_OF_PROCESSORS = `1'
> PROMPT = `$P$G'
> LOGONSERVER = `\\ZAV002361'
> OS2LIBPATH = `C:\WINNT\system32\os2\dll;'
> COMSPEC = `C:\WINNT\system32\cmd.exe'
> !C: = `C:\cygwin\bin'
> SYSTEMDRIVE = `C:'
> HOSTNAME = `ZAV002361'
> PROCESSOR_REVISION = `080a'
> PATHEXT = `.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
> COMPUTERNAME = `ZAV002361'
> WINDIR = `C:\WINNT'
> USERPROFILE = `C:\Documents and Settings\rleg'
> PS1 = `\[\033]0;\w\007
> \033[32m\]\u@\h \[\033[33m\w\033[0m\]
> $ '
> PROGRAMFILES = `C:\Program Files'
> !:: = `::\'
> MACHTYPE = `i686-pc-cygwin'
> PROCESSOR_IDENTIFIER = `x86 Family 6 Model 8 Stepping 10, GenuineIntel'
> OS = `Windows_NT'
> OLDPWD = `/home/rleg/project/cygwin/bug_001/cygwin-1.3.3-2/winsup/utils'
> PROCESSOR_ARCHITECTURE = `x86'
> TEMP = `/cygdrive/c/DOCUME~1/rleg/LOCALS~1/Temp'
> PROCESSOR_LEVEL = `6'
> SYSTEMROOT = `C:\WINNT'
> TMP = `/cygdrive/c/DOCUME~1/rleg/LOCALS~1/Temp'
> HOMEDRIVE = `C:'
> ALLUSERSPROFILE = `C:\Documents and Settings\All Users'
> SHLVL = `1'
> APPDATA = `C:\Documents and Settings\rleg\Application Data'
> COMMONPROGRAMFILES = `C:\Program Files\Common Files'
> HOMEPATH = `\'
> USERDOMAIN = `ZAV002361'
> USERNAME = `rleg'
> SHELL = `/bin/bash'
> HOSTTYPE = `i686'
> OSTYPE = `cygwin'
> TERM = `cygwin'
> _ = `/usr/bin/cygcheck'
> TZ = `RST-1RDT-2,M3.5.0/2,M10.5.0/3'
> 
> HKEY_CURRENT_USER\Software\Cygnus Solutions
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
>   (default) = `/cygdrive'
>   cygdrive flags = 0x00000022
> HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
> HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu\Programs\Cygnus Solutions
>   (default) = (unsupported type)
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/
>   (default) = `C:/cygwin'
>   flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
>   (default) = `C:/cygwin/bin'
>   flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
>   (default) = `C:/cygwin/lib'
>   flags = 0x0000000a
> HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
> 
> a:  fd           N/A    N/A
> c:  hd  FAT32  19082Mb  22% CP    UN
> d:  cd           N/A    N/A
> e:  net NTFS   17358Mb  97% CP CS UN PA FC     soft
> f:  net NTFS    6243Mb  75% CP CS UN PA FC     data
> 
> C:\cygwin\bin  /usr/bin  system  binmode
> C:\cygwin\lib  /usr/lib  system  binmode
> C:\cygwin  /        system  binmode
> c:    /cygdrive/c  user    binmode,noumount
> e:    /cygdrive/e  user    binmode,noumount
> f:    /cygdrive/f  user    binmode,noumount
> 
> Found: C:\cygwin\bin\bash.exe
> Found: C:\cygwin\bin\cat.exe
> Found: C:\cygwin\bin\cpp.exe
> Found: C:\cygwin\bin\find.exe
> Found: C:\cygwin\bin\gcc.exe
> Found: C:\cygwin\bin\gdb.exe
> Found: C:\cygwin\bin\ld.exe
> Found: C:\cygwin\bin\ls.exe
> Found: C:\cygwin\bin\make.exe
> Found: C:\cygwin\bin\sh.exe
> 
>    56k 2000/12/03 C:\cygwin\bin\cygbz21.0.dll - os=4.0 img=1.0 sys=4.0
>                   "cygbz21.0.dll" v0.0 ts=2000/11/21 0:53
>    81k 2000/12/05 C:\cygwin\bin\cygitcl30.dll - os=4.0 img=1.0 sys=4.0
>                   "cygitcl30.dll" v0.0 ts=2000/11/26 2:43
>    35k 2000/12/05 C:\cygwin\bin\cygitk30.dll - os=4.0 img=1.0 sys=4.0
>                   "cygitk30.dll" v0.0 ts=2000/11/26 2:43
>   390k 2000/12/05 C:\cygwin\bin\cygtcl80.dll - os=4.0 img=1.0 sys=4.0
>                   "cygtcl80.dll" v0.0 ts=2000/11/26 2:39
>     5k 2000/12/05 C:\cygwin\bin\cygtclpip80.dll - os=4.0 img=1.0 sys=4.0
>    10k 2000/12/05 C:\cygwin\bin\cygtclreg80.dll - os=4.0 img=1.0 sys=4.0
>                   "cygtclreg80.dll" v0.0 ts=2000/11/26 2:39
>   623k 2000/12/05 C:\cygwin\bin\cygtk80.dll - os=4.0 img=1.0 sys=4.0
>                   "cygtk80.dll" v0.0 ts=2000/11/26 2:43
>    18k 2000/10/23 C:\cygwin\bin\cyggdbm.dll - os=4.0 img=1.0 sys=4.0
>                   "cyggdbm.dll" v0.0 ts=2000/10/23 4:26
>    21k 2001/06/20 C:\cygwin\bin\cygintl.dll - os=4.0 img=1.0 sys=4.0
>                   "cygintl.dll" v0.0 ts=2001/6/20 19:09
>    45k 2001/07/04 C:\cygwin\bin\cygjbig1.dll - os=4.0 img=1.0 sys=4.0
>                   "cygjbig1.dll" v0.0 ts=2001/7/4 5:25
>   119k 2001/06/06 C:\cygwin\bin\cygjpeg6b.dll - os=4.0 img=1.0 sys=4.0
>                   "cygjpeg6b.dll" v0.0 ts=2001/6/6 6:27
>   163k 2001/05/06 C:\cygwin\bin\cygpng2.dll - os=4.0 img=1.0 sys=4.0
>                   "cygpng2.dll" v0.0 ts=2001/5/6 6:05
>    45k 2001/04/25 C:\cygwin\bin\cygform5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygform5.dll" v0.0 ts=2001/4/25 7:28
>    26k 2001/04/25 C:\cygwin\bin\cygmenu5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygmenu5.dll" v0.0 ts=2001/4/25 7:27
>   156k 2001/04/25 C:\cygwin\bin\cygncurses++5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygncurses++5.dll" v0.0 ts=2001/4/25 7:29
>   226k 2001/04/25 C:\cygwin\bin\cygncurses5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygncurses5.dll" v0.0 ts=2001/4/25 7:17
>    15k 2001/04/25 C:\cygwin\bin\cygpanel5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygpanel5.dll" v0.0 ts=2001/4/25 7:27
>    17k 2001/06/28 C:\cygwin\bin\cyghistory4.dll - os=4.0 img=1.0 sys=4.0
>                   "cyghistory4.dll" v0.0 ts=2001/1/7 5:34
>    21k 2001/06/28 C:\cygwin\bin\cyghistory5.dll - os=4.0 img=1.0 sys=4.0
>                   "cyghistory5.dll" v0.0 ts=2001/6/28 4:27
>   108k 2001/06/28 C:\cygwin\bin\cygreadline4.dll - os=4.0 img=1.0 sys=4.0
>                   "cygreadline4.dll" v0.0 ts=2001/1/7 5:34
>   135k 2001/06/28 C:\cygwin\bin\cygreadline5.dll - os=4.0 img=1.0 sys=4.0
>                   "cygreadline5.dll" v0.0 ts=2001/6/28 4:27
>   245k 2001/06/12 C:\cygwin\bin\cygtiff3.dll - os=4.0 img=1.0 sys=4.0
>                   "cygtiff3.dll" v0.0 ts=2001/6/12 19:25
>    41k 2001/07/04 C:\cygwin\bin\cygXpm-noX4.dll - os=4.0 img=1.0 sys=4.0
>                   "cygXpm-noX4.dll" v0.0 ts=2001/7/4 3:21
>    45k 2001/07/04 C:\cygwin\bin\cygXpm-X4.dll - os=4.0 img=1.0 sys=4.0
>                   "cygXpm-X4.dll" v0.0 ts=2000/11/20 3:45
>    49k 2001/02/03 C:\cygwin\bin\cygz.dll - os=4.0 img=1.0 sys=4.0
>                   "cygz.dll" v0.0 ts=2001/2/3 21:35
>   701k 2001/09/13 C:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
>                   "cygwin1.dll" v0.0 ts=2001/9/13 5:54
>     Cygwin DLL version info:
>         dll major: 1003
>         dll minor: 3
>         dll epoch: 19
>         dll bad signal mask: 19005
>         dll old termios: 5
>         dll malloc env: 28
>         api major: 0
>         api minor: 46
>         shared data: 3
>         dll identifier: cygwin1
>         mount registry: 2
>         cygnus registry name: Cygnus Solutions
>         cygwin registry name: Cygwin
>         program options name: Program Options
>         cygwin mount registry name: mounts v2
>         cygdrive flags: cygdrive flags
>         cygdrive prefix: cygdrive prefix
>         cygdrive default prefix:
>         build date: Wed Sep 12 23:54:31 EDT 2001
>         shared id: cygwin1S3
> 
> Use -h to see help about each section
> 
>   ------------------------------------------------------------------------
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webmaster	delorie software privacy
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Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
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Sender:	cygwin-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin AT sources DOT redhat DOT com
Message-ID:	<3BBAE7B8.4567166E@iee.org>
Date:	Wed, 03 Oct 2001 11:26:00 +0100
From:	Don Sharp <dwsharp AT iee DOT org>
X-Mailer:	Mozilla 4.78 [en] (WinNT; U)
X-Accept-Language:	en
MIME-Version:	1.0
To:	Robert Legros <robert_legros AT yahoo DOT com>
CC:	gnuwin32 <cygwin AT cygwin DOT com>
Subject:	Re: 1.3.3-2: Process creation is possible with ppid = 0 and pgid = 0
References:	<20011003090000 DOT 448 DOT qmail AT web11502 DOT mail DOT yahoo DOT com>