Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!shukra!ram
From: ram%shukra@Sun.COM (Renu Raman, Sun Microsystems)
Newsgroups: comp.unix.wizards
Subject: Re: To find out the names of open files in a process
Message-ID: <39192@sun.uucp>
Date: 18 Jan 88 20:11:28 GMT
References: <2346@mandrill.CWRU.Edu>
Sender: news@sun.uucp
Lines: 37
Summary: Process suspension and resumption

In article <2346@mandrill.CWRU.Edu>, garg@mandrill.CWRU.Edu (Dev Datt Garg) writes:
> 
> Hi Friends,
> 	I am working on my M.S. Thesis. I am extending the command language of
> GDB(Gnu Debugger) for Sun3 running BSD unix. One of the features I am trying 
> to add is to be able to save the context of a process at any point in the 
> user program, so that at later stage program can be restarted from that point.
> I have got some success in doing that. I am having a problem, If the program,
> which I am debugging has some files open. I am unable to know which files were
>  open, so that the status of those files can be restored.
> 
> 	Of course one of the things I am saving is a user structure, which 
> contains most of the info regarding process context. I somehow want to
> recover the names of the open files from this struct or from anywhere else.
> I will highly appreciate if some Guru could tell me some way of achieving
> that.
> 	Thanx in advance.
> 
> usenet: {decvax,cbosgd,sun}!mandrill!garg	Dev Datt Garg
> csnet:       garg@mandrill.CWRU.edu
> arpa:        garg@mandrill.CWRU.edu

   Read the report "An unix 4.2 BSD implementation of Process suspension
   and resumption" by A.Y. Chen (Jun 86 , U. of Ill, report no. UiUCDCS-R-86-1286
   ).  At the end of the report is included the source code which includes
   some diffs to the kernel - user structure, kern_descrip.c, kern_exec.c,
   ufs_nami.c.   I guess the objective there was to checkpoint a process and
   save the process state in a stable storage and restore it when needed.

   An implementation was done on SYS V too.  Just send mail to 
   Erna Amerman (erna@a.cs.uiuc.edu) and ask for report DCS-R-86-1286.

---------------------
   Renukanthan Raman				ARPA:ram@sun.com
   Sun Microsystems			UUCP:{ucbvax,seismo,hplabs}!sun!ram
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