Path: utzoo!attcan!uunet!lll-winken!ames!pasteur!ucbvax!hplabs!hpfcdc!stroyan
From: stroyan@hpfcdc.HP.COM (Mike Stroyan)
Newsgroups: comp.sys.hp
Subject: Re: find(1) function copying on HP-UX
Message-ID: <5570176@hpfcdc.HP.COM>
Date: 12 May 89 03:42:03 GMT
References: <240028@grlab.UUCP>
Organization: HP Ft. Collins, Co.
Lines: 30

>  1) find has a -mountstop(or something like that)==>it recognizes mount
>     points. It would be nice to able to tell my program to not cross
>     mount points without having to tell it to explicitly "prune" all of
>     the mount point directories.

You can recognize mount points by using stat(2) on each directory and
watching for changes in the st_dev field.

>  2) find recognizes file system types.

You can check the file system type of a path by using getmntent(3X)
to look up the /etc/mnttab entries and matching the mnt_fsname field
to the mount point.  The file system type is in the mnt_type field.

>  3) HP-UX has "Context Dependent Files"(CDFs) that are really hidden
>     directories containing the file that is really referred to.
      
>     At any rate, the readdir routines read the contents of /etc as
>     including the regular file "inittab" instead of the hidden
>     directory "inittab+", but find(1) is able to display the hidden
>     directories with a "-hidden" switch or "-type H". I want to do this,
>     too.

The CDFs can recognized by calling stat(2).  The S_ISCDF macro described
in stat(5) will test for a CDF using the st_mode field.

You might also want to watch for symbolic links with the S_ISLNK macro
from stat(5).

Mike Stroyan, stroyan@hpstryn