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操作系统SunOS 4.1.3版本的源码

	This is a procedure you can use to substitute or add 
a module in your shared libc library. 

Note! if you are interested  system 5 libc, please substitute
	libc_pic.a to libcs5_pic.a in step 3, 
	libc.so.x.y.z to libcs5.so.x.y.z in step 8.

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1. Become super user
	% su

2. Make a temporary directory
	% mkdir tmp

3. Change to the "tmp" directory just made, extract the pic .o from 
   libc_pic.a and rm the file __.SYMDEF. The reason you need to do 
   the 2 "mv" commands is because "ar" truncated filenames over 
   16 characters.
	% cd tmp
	% ar x ../libc_pic.a
	% rm __.SYMDEF
	% mv rpc_dtablesize. rpc_dtablesize.o
	% mv rpc_commondata. rpc_commondata.o

4. Replace or add the .o that you wanted by doing a copy. Please
   note here that you are advised to create your object with
   the following compiler option, i.e "cc -c -pic yourprogram.c" to make
   it shareable.
	% cp your.o .

5. If you add a new module then you need to do this step.
   You need to edit the file "lorder-sparc" and add the name of the file
   you have copied from step 4 at the end of this file. 
	% vi ../lorder-sparc

6. 	% cd ..

7. 	% make libc.so

8. Now you should have some libc.so.x.y.z built in the current directory.
   It is recommended that you tested out this library at this point 
   before installing it. You can do so by setting the environment
   LD_LIBRARY_PATH  to the current directory for example:
   	% setenv LD_LIBRARY_PATH `pwd`
	% your_favorite_test_cmd
   Once you are satisfied that the new library worked, you can proceed
   to install it with the following commands:
	% cp libc.so.x.y.z /usr/lib
	% ldconfig
	% unsetenv LD_LIBRARY_PATH

9. You are now running with the new library. You can verify this by
   doing a trace command of let's say "date".
	% trace date
   The output should informed you that the new library is being used.