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Full Discussion: Has anyone seen this issue with the /dev/null?
Top Forums UNIX for Advanced & Expert Users Has anyone seen this issue with the /dev/null? Post 28431 by oott on Wednesday 18th of September 2002 12:32:09 PM
Old 09-18-2002
Question Has anyone seen this issue with the /dev/null?
hello all,
I am working in a Hpux 11.0 64 bit environment. I am not sure if a third party software is doing this or not, but the admin to this server says it is not a server issue as he has check and double check logs and crons to verify this issue. My problem, is that every now and then, once and hour or so, the /dev/null device gets its permissions changed to read only.... As you know, this can be a big head-ache for a lot of processes and apps that use this particuar device. One major software that we are seeing a lot of incidents with is Oracle. It uses the /dev/null a lot and whenever the permissions gets changed, Oracle complains. I am also getting this message when I log into the server every now and then. So to work around this issue, the sysadmin has a cron that goes out and checks the permissions on the /dev/null device....but unfortunately cron only runs to the minute level and I need this to run at least every 3-5 seconds as we have files processing against Oracle constantly 24 X 7.....and I am not really comfortable with band aid approaches......Does anyone have any recommendations. This is starting to be a big issue for me now that this server is starting to be utilize a lot more than before...

thanks,
OS
 

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LEARN ABOUT MINIX

s_n_d

SET_NET_DEFAULT(8)					      System Manager's Manual						SET_NET_DEFAULT(8)

NAME

       s_n_d, set_net_default - select the default TCP/IP network

SYNOPSIS

       set_net_default: not found

DESCRIPTION

       This  manual page is here because so many others refer to it.  The set_net_default command does not exist under standard Minix, because the
       TCP/IP server only supports one network.  The server under Minix-vmd supports four different networks, that  can  each  be  chosen  as  the
       default network.

       The  TCP/IP library and commands do have a notion about a "default network" however, because the code is shared between the Minix versions.
       So if you want to venture into network programming then you should know about the devices and environment variables mentioned below to make
       your program compatible.  (Especially since there is a plan to upgrade the TCP/IP server for standard Minix.)

   Options and environment to change the default
       Many  TCP/IP  programs implement the following options and environment variables to change the default devices set by set_net_default.  The
       options are only implemented for low level programs where it makes sense to name a network device.  The environment variables are  used	in
       all code.  You can run a process and all its children connected to a different network by setting four environment variables.

       ETH_DEVICE=device
       -E device
	      Device to use as raw ethernet device instead of the default /dev/eth.

       PSIP_DEVICE=device
       -P device
	      Pseudo IP device to use instead of /dev/psip.

       IP_DEVICE=device
       -I device
	      IP device to use instead of /dev/ip.

       TCP_DEVICE=device
       -T device
	      TCP device to use.

       UDP_DEVICE=device
       -U device
	      UDP device to use.

FILES

       /dev/eth[01]	 First and second raw ethernet.

       /dev/psip[01]	 First and second Pseudo IP network.

       /dev/ip[0123]	 IP devices for two ethernets and two Pseudo IP networks.

       /dev/tcp[0123]	 TCP devices for same four networks.

       /dev/udp[0123]	 UDP devices.

       /dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
			 Devices  for  the default network, links to the devices above.  Eth is only present if ethernet is the default, psip only
			 for pseudo IP.

SEE ALSO

       ip(4), boot(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																SET_NET_DEFAULT(8)
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