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- Xref: sparky comp.unix.solaris:296 comp.unix.bsd:8797
- Path: sparky!uunet!auspex-gw!guy
- From: guy@Auspex.COM (Guy Harris)
- Newsgroups: comp.unix.solaris,comp.unix.bsd
- Subject: Re: Solaris 1.1 vs. Solaris 2.0 (BSD vs AT&T)
- Message-ID: <15468@auspex-gw.auspex.com>
- Date: 12 Nov 92 22:30:59 GMT
- References: <kzin.721442926@cc.gatech.edu> <BxLz6x.EL7@cs.uiuc.edu>
- Sender: news@auspex-gw.auspex.com
- Followup-To: comp.unix.solaris
- Organization: Auspex Systems, Santa Clara
- Lines: 33
- Nntp-Posting-Host: auspex.auspex.com
-
- >If the program accesses the kernel (not just by system calls)
-
- I presume by "access the kernel" you mean things such as opening
- "/dev/kmem" and looking at kernel data structures (or using the "kvm"
- library).
-
- If so, then for those to whom it's not obvious why such programs would
- need to be ported, kernel data structures are probably *quite* different
- in Solaris 2.x, which is why programs that access those data structures
- directly will need to be changed.
-
- (Note that programs that mainly just read the process table, and maybe
- process U areas, can, in Solaris 2.x, use the standard SVR4 "/proc" file
- system. That will make them more likely to run under future Solaris 2.x
- releases, and under other SVR4 releases; it will also probably make them
- simpler, and possibly even less likely to fail in the fashion hinted at
- in the SunOS 4.x "ps" manual page:
-
- BUGS
- Things can change while ps is running; the picture it gives
- is only a close approximation to the current state.
-
- Things can still change out from under you, but "/proc" may make it
- less likely to happen.)
-
- >or if the
- >program access some of the system files that have changed (like /etc/fstab =>
- >/etc/vfstab), it will have to be ported.
-
- Yup, this is a bit of a headache, as the "getmntent()" routine doesn't
- hide the name of the file. SVR4 has "getvfsent()" to read
- "/etc/vfstab", and "getmntent()" to read "/etc/mnttab", and hides the
- file name.
-