[9fans] rfork

[9fans] rfork

[Sergey Reva]

Hello Fans,

How create process in new window, without exit from current?

Now I use:

rfork(RFPROC|RFNOWAIT|RFCFDG|RFNAMEG|RFENVG);
execl("/bin/plumb","plumb",-SomeFileName-,0);

New window created (because page create it), but current process
exited? Whats wrong, and how create new window for new process.

I can't find simple example, please help.
-- 
http://rs-rlab.narod.ru                          mailto:rs_rlab@mail.ru

Re: [9fans] rfork

[Tiit Lankots]

> rfork(RFPROC|RFNOWAIT|RFCFDG|RFNAMEG|RFENVG);
> execl("/bin/plumb","plumb",-SomeFileName-,0);

rfork() literally forks the process. This snippet of code suggests that
_both_ of your processes afterwards get replaced by /bin/plumb; I think
your intention was to execl() only in the child. Check the man pages.

A new window is created by
	echo new > /dev/wctl

see rio(4)

Re: [9fans] rfork

[Sergey Reva]

Hello Tiit,

Thursday, January 6, 2005, 3:35:43 PM, you wrote:
>> rfork(RFPROC|RFNOWAIT|RFCFDG|RFNAMEG|RFENVG);
>> execl("/bin/plumb","plumb",-SomeFileName-,0);
TL> rfork() literally forks the process. This snippet of code suggests that
TL> _both_ of your processes afterwards get replaced by /bin/plumb; I think
TL> your intention was to execl() only in the child. Check the man pages.

rfork is new technique for me, and not shure I understand all exact.
Snippet created while I read man page, but don't work.
Please explain how create new process.

-- 
http://rs-rlab.narod.ru                            mailto:rs_rlab@mail.ru

Re: [9fans] rfork

[Nigel Roles]

Sergey Reva wrote:

>Hello Tiit,
>
>Thursday, January 6, 2005, 3:35:43 PM, you wrote:
>  
>
>>>rfork(RFPROC|RFNOWAIT|RFCFDG|RFNAMEG|RFENVG);
>>>execl("/bin/plumb","plumb",-SomeFileName-,0);
>>>      
>>>
>TL> rfork() literally forks the process. This snippet of code suggests that
>TL> _both_ of your processes afterwards get replaced by /bin/plumb; I think
>TL> your intention was to execl() only in the child. Check the man pages.
>
>rfork is new technique for me, and not shure I understand all exact.
>Snippet created while I read man page, but don't work.
>Please explain how create new process.
>
>  
>
rfork creates two identical processes by cloning the original.
execl replaces the running process with another executable
rfork returns 0 if you are the new process, >0 if you are the original, so

if (rfork(RFPROC|RFNOWAIT|RFCFDG|RFNAMEG|RFENVG) == 0)
  execl("/bin/plumb","plumb",-SomeFileName-,0);