Code in C to make a module pause?

[Jason Gerfen]

I think that helps a ton, thanks...

Kenneth Goodwin wrote:

>> -----Original Message-----
>> From: pam-list-bounces at redhat.com
>> [mailto:pam-list-bounces at redhat.com]On
>> Behalf Of Jason Gerfen
>> Sent: Friday, July 02, 2004 12:46 PM
>> To: Pluggable Authentication Modules
>> Subject: Code in C to make a module pause?
>>
>>
>> I am not sure if this is the right place to ask this
>>    
>>
>seeing as it is
>  
>
>> more of programming question in response to how to make a
>>    
>>
>list of
>  
>
>> system() calls pause()?
>>
>> The reason I ask is because PAM works as a shared object
>>    
>>
>so
>  
>
>> there is no
>> interaction with the user / keyboard (after the login
>>    
>>
>information is
>  
>
>> passed) and I would like to use the pause() function to
>>    
>>
>require the
>  
>
>> module to wait until a system() command has finished,
>> without the need
>> to fork the process.
>>    
>>
>
>I am presuming by system() that you are refering to the LIBC
>system() subroutine
>The system() subroutine call works by forking and execing
>the command named as it's
>string variable parameter passed as part of the call (ie
>system("/bin/who"); )
>It is a simple C library function.
>
>the fork is required in order to execute the command
>specified. The system() call itself waits
>until the command requested exits. This is in effective the
>pause() you wish.
>
>You can't Pause true system calls like open(), fork(), AND
>exec() at all.
>If I understand your question, then in the code snipnet
>below --
>
>i = 0;
>system("/bin/who");
>i++;
>
>
>"i" does not get incremented to 1 UNTIL the /bin/who command
>has completely executed and returned control
>back to the calling program. This appears to be the
>behaviour you are asking for.
>If you are doiung a FORK() call before calling System(),
>then you are probably being redunant as system() does
>not require you to fork() before calling it. It does that op
>itself.
>
>If you wish different behaviour for system(), then do a "man
>system".
>the man page has a source Code example of how to roll your
>own system() subroutine.
>
>
>
>
>
>  
>
>> Anyone accomplish this before?
>>
>> --
>> Jason Gerfen
>> Student Computing Group
>> Marriott Library
>> University of Utah
>> (801) 585-9810
>> jason.Gerfen at scl.utah.edu
>>
>> "...Sometimes I just yell at myself. And it
>>  makes me sad, sometimes I make myself cry..."
>> 			~ My nephew Dawsyn
>>
>>
>>
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>>
>>    
>>
>
>
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>  
>


-- 
Jason Gerfen
Student Computing Group
Marriott Library
University of Utah
(801) 585-9810
jason.Gerfen at scl.utah.edu

"...Sometimes I just yell at myself. And it
 makes me sad, sometimes I make myself cry..."
			~ My nephew Dawsyn