How to stop other processes and kernel from printing output on current virtual term Post: 302327998

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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

06-23-2009

Registered User

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

ku@ntum

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LEARN ABOUT FREEBSD

if_vmx

VMX(4)							   BSD Kernel Interfaces Manual 						    VMX(4)

NAME

     vmx -- VMware VMXNET3 Virtual Interface Controller device

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device vmx

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   if_vmx_load="YES"

DESCRIPTION

     The vmx driver provides support for the VMXNET3 virtual NIC available in virtual machines by VMware.  It appears as a simple Ethernet device
     but is actually a virtual network interface to the underlying host operating system.

     This driver supports the VMXNET3 driver protocol, as an alternative to the emulated pcn(4), em(4) interfaces also available in the VMware
     environment.  The vmx driver is optimized for the virtual machine, it can provide advanced capabilities depending on the underlying host
     operating system and the physical network interface controller of the host.  The vmx driver supports features like multiqueue support, IPv6
     checksum offloading, MSI/MSI-X support and hardware VLAN tagging in VMware's VLAN Guest Tagging (VGT) mode.

     The vmx driver supports VMXNET3 VMware virtual NICs provided by the virtual machine hardware version 7 or newer, as provided by the following
     products:

	   o   VMware ESX/ESXi 4.0 and newer
	   o   VMware Server 2.0 and newer
	   o   VMware Workstation 6.5 and newer
	   o   VMware Fusion 2.0 and newer

     For more information on configuring this device, see ifconfig(8).

MULTIPLE QUEUES

     The vmx driver supports multiple transmit and receive queues.  Multiple queues are only supported by certain VMware products, such as ESXi.
     The number of queues allocated depends on the presence of MSI-X, the number of configured CPUs, and the tunables listed below.  FreeBSD does
     not enable MSI-X support on VMware by default.  The hw.pci.honor_msi_blacklist tunable must be disabled to enable MSI-X support.

LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).

     hw.vmx.txnqueue

     hw.vmx.X.txnqueue
	     Maximum number of transmit queues allocated by default by the driver.  The default value is 8.  The maximum supported by the VMXNET3
	     virtual NIC is 8.

     hw.vmx.rxnqueue

     hw.vmx.X.rxnqueue
	     Maximum number of receive queues allocated by default by the driver.  The default value is 8.  The maximum supported by the VMXNET3
	     virtual NIC is 16.

     hw.vmx.txndesc

     hw.vmx.X.txndesc

	     Number of transmit descriptors allocated by the driver.  The default value is 512.  The value must be a multiple of 32, and the maxi-
	     mum is 4096.

     hw.vmx.rxndesc

     hw.vmx.X.rxndesc

	     Number of receive descriptors per ring allocated by the driver.  The default value is 256.  The value must be a multiple of 32, and
	     the maximum is 2048.  There are two rings so the actual usage is doubled.

EXAMPLES

     The following entry must be added to the VMware configuration file to provide the vmx device:

	   ethernet0.virtualDev = "vmxnet3"

SEE ALSO

     altq(4), arp(4), em(4), netintro(4), ng_ether(4), pcn(4), vlan(4), ifconfig(8)

AUTHORS

     The vmx driver was ported from OpenBSD and significantly rewritten by Bryan Venteicher <bryanv@freebsd.org>.  The OpenBSD driver was written
     by Tsubai Masanari.

BSD
								  March 17, 2014							       BSD

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