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Full Discussion: LibC.a usage in /usr/lib/boot/chrp.disk.proto
Operating Systems AIX LibC.a usage in /usr/lib/boot/chrp.disk.proto Post 302774309 by DGPickett on Friday 1st of March 2013 02:44:12 PM
Old 03-01-2013
Well, libC.a is a static (compile-time) linkable object library to support system functions written in the matching compiler. It is actually an ar archive of many *.o files compiled from *.cpp, assuming capital C implies C++. Only the referenced code is copied out of the library into your executable, not necessarily the entire file. It can be reworked into a libC.so dynamic, shared object (run-time and read-only parts in shared RAM/VM pages paged direct from the .so, no swap used) library. But really, .o, and hence .a and .so, could come from any mix of compilers and languages, as long as everyone agrees on call stack atructure and such.

I assume this reference is to make sure it is linked into the kernel, which might have to run in a primitive mode that does not support dynamic, shared object library. UNIX systems primarily depend on libc.so, which supports the c language, and is usable in C++ using 'extern "C" {...}' declaration wrappers. The C++ variable names are mangled to code in a check for the type and if a call the argument number and each type. This tells C++ not to mangle c calls and variables. The reciprocal 'extern "C++"{...}' tells the C compiler to mangle to call C++ names.
 

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LEARN ABOUT OSF1

installboot

installboot(1M) 														   installboot(1M)

NAME

       installboot - install bootblocks in a disk partition

SYNOPSIS

       installboot bootblk raw-disk-device

       The boot(1M) program, ufsboot, is loaded from disk by the bootblock program which resides in the boot area of a disk partition.

       The  ufs  boot objects are platform-dependent, and reside in the /usr/platform/platform-name/lib/fs/ufs directory. The platform name can be
       found using the -i option of uname(1).

       The installboot utility is a SPARC only program. It is not supported on the  architecture.  users should use installgrub(1M) instead.

       bootblk	       The name of the bootblock code.

       raw-disk-device The name of the disk device onto which the bootblock code is to be installed; it must be a character device which is  read-
		       able and writable. Naming conventions for a SCSI or IPI drive are c?t?d?s? and c?d?s? for an IDE drive.

       Example 1: Installing UFS Boot Block

       To install a ufs boot block on slice 0 of target 0 on controller 1 of the platform where the command is being run, use:

	      example# installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk 
		   /dev/rdsk/c1t0d0s0

       /usr/platform/platform-name/lib/fs/ufs

	   directory where ufs boot objects reside.

       /platform/platform-name/ufsboot

	   second level program to boot from a disk or CD

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

       od(1), uname(1), boot(1M), init(1M), kadb(1M), kernel(1M), monitor(1M), reboot(1M), rpc.bootparamd(1M), init.d(4), attributes(5)

WARNINGS

       The installboot utility fails if the bootblk or openfirmware files do not exist or if the raw disk device is not a character device.

								    11 Apr 2005 						   installboot(1M)
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