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Full Discussion: How to stop other processes and kernel from printing output on current virtual term
Top Forums Programming How to stop other processes and kernel from printing output on current virtual term Post 302327998 by ku@ntum on Tuesday 23rd of June 2009 06:53:39 AM
Old 06-23-2009
Kindly suggest how can I restrict kernel and other utilities that generate logs entries through klogd and syslog to a specific (fixed) virtual terminal.

Since /dev/tty1 will be hosting my application, I can open up /dev/tty2 to have all system wide log entries there. So is there any thing in kernel arguments, and/or in configuration that I can change/make to restrict all kernel output to a specific console.

Also I post this in programming forum, because in my application, I explicitly made the STDOUT(/dev/tty1) exclusive to my application, and redirect all the output to the /dev/tty2. Here is the code ...
Code:
bool TerminalSetup()
{
	bool bRet = false;
	
	if (ioctl(1, TIOCEXCL, 0) != 0)
	{
		printf("\n -- Error!!\nUnable to put the terminal into exclusive mode.. ");
	}
	
	int iFd = 0;	
        string ref_strRedirTerminal = "/dev/tty2";
	if ((iFd = open(ref_strRedirTerminal.c_str(), O_RDWR)) == -1) /* strange ... */
	{
		fprintf(stderr, "Could not open %s R/W (%s)\n", ref_strRedirTerminal.c_str(), strerror(errno));
		fflush(stderr);
		return false;		/* maybe above user limit? */
	}
	
	if (ioctl(iFd, TIOCCONS, 0))
	{
		fprintf(stderr, "Terminal redirection fails. (%s)\n", strerror(errno));
		fflush(stderr);		
	}
		
	close(iFd);
	
	bRet = true;	
	return bRet;
}

So what I get in result is that when I redirected an output to /dev/tty1 through echo as
Code:
echo "Testing ..." > /dev/tty1

the output did redirected to the /dev/tty2 as I made it explicit in my code. But when partition tables are re-synced from fdisk utility, the kernel outputs on the /dev/tty1 (as it was active then).

Hence the above code to make /dev/tty1 exclusive to my process, and redirect all output to /dev/tty2 fails partially.

So any thoughts then.

Kashif
 

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LEARN ABOUT SUNOS

cvc

cvc(7D) 							      Devices								   cvc(7D)

NAME

       cvc - virtual console driver

DESCRIPTION

       The  cvc  virtual  console  driver  is a STREAMS-based pseudo driver that supports the network console. The cvc driver interfaces with con-
       sole(7D).

       Logically, the  cvc driver sits below the  console driver. It redirects console output to the cvcredir(7D) driver if a network console con-
       nection is active. If a network console connection is not active, it redirects console output to an internal hardware interface.

       The cvc driver receives console input from  cvcredir and internal hardware and passes it to the process associated with /dev/console.

NOTES

       The   cvc facility supersedes the SunOS wscons(7D) facility, which should  not be used in conjunction with  cvc. The  wscons driver is use-
       ful for systems with directly attached consoles (frame buffers and keyboards), but is not useful with platforms using cvc,  which  have	no
       local keyboard or frame buffer.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+--------------------------------------+
       |  ATTRIBUTE TYPE    |		ATTRIBUTE VALUE 	   |
       +--------------------+--------------------------------------+
       |Architecture	    |Sun  Enterprise  10000  servers,  Sun |
       |		    |Fire 15000 servers 		   |
       +--------------------+--------------------------------------+
       |Availability	    |SUNWcvc.u				   |
       +--------------------+--------------------------------------+

SEE ALSO

       cvcd(1M), attributes(5), console(7D), cvcredir(7D), wscons(7D)

       Sun Enterprise 10000 SSP Reference Manual

       Sun System Management Services (SMS) Reference Manual

SunOS 5.10							    15 Sep 2000 							   cvc(7D)
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