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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!simtel!lll-winken.llnl.gov!venus.sun.com!wnoc-sfc-news!tm-news!orchard.sfc.wide.ad.jp!nishida From: nishida@orchard.sfc.wide.ad.jp (Yoshifumi Nishida) Newsgroups: comp.unix.bsd.misc Subject: ifnet structure in BSD Date: 04 Sep 1995 18:30:48 GMT Organization: Keio Univ. Shonan Fujisawa Campus, Tokuda & Murai Lab. Lines: 17 Distribution: world Message-ID: <NISHIDA.95Sep5033048@orchard.sfc.wide.ad.jp> NNTP-Posting-Host: orchard.sfc.wide.ad.jp Hi, folks. I'm afraid this is a silly question. but I want to know... In SunOS 4.1, the ifnet structure has two members whose names are if_upper and if_lower. These members indicate next layer up and next layer down. Using these members, We can make network device drivers modularized. But In 4.4BSD, they aren't in the ifnet structure. So, how can I indicate next layer up or down in network device driver's code? how can I make network device drivers modularized?? Thanks in advance and sorry for my poor English. -- Yoshifumi Nishida nishida@sfc.wide.ad.jp Keio Univ.