Listener fork

I've installed 10g on Linux platform.When I run
ps -ef | grep tnslsnr
it shows multiple listener processes with same name.
Does any one know  why ?
This may be cause some point of time to exceed # of linux processes.
Please let me know why, is there any parameters I need to change or reset?

/u01/app/oracle/product/10.2.0/bin/tnslsnr listener_sales -inherit
oracle 22661 22660 0 May30 ? 00:00:02 /u01/app/oracle/product/10.2.0/bin/tnslsnr listener_sales -inherit
oracle 22662 22661 0 May30 ? 00:00:02 /u01/app/oracle/product/10.2.0/bin/tnslsnr listener_sales -inherit
oracle 22663 22661 0 May30 ? 00:00:00 /u01/app/oracle/product/10.2.0/bin/tnslsnr listener_sales -inherit

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