How to change current Solaris version for a program?

Question

Hello,
A program I am trying to run under Solaris 5.10 checks the OS version to be 5.8 or 5.9.
Can I somehow tell Solaris to report 5.9 to the program instead of 5.10?
According to "Solaris Application Guarantee" I should be able to run 5.8/9 programs under Solaris 10 with no problems.
Thakns,
Victor

Answer 1

You can use dtrace to manipulate the OS version on-the-fly.
eg.,
% cat sysrelease.d
#!/usr/sbin/dtrace -Cws
#include <sys/utsname.h>
syscall::uname:entry
        this->in = (struct utsname *)arg0;
syscall::uname:return
        copyoutstr($$1, (uintptr_t)&this->in->release[0], SYS_NMLN);
}This script accepts an argument, the version of our choice; so as long as the script is running, OS returns our input as output to uname -r. Once the script exits, OS returns the true version.
% uname -a
SunOS sunfire4 5.10.1 snv_10 sun4u sparc SUNW,Sun-Fire-1280R
% ./sysrelease.d 5.9
dtrace: script './sysrelease.d' matched 2 probes
dtrace: allowing destructive actions
.. script waits here doing nothing ..
In another window:
% uname -a
SunOS sunfire4 5.9 snv_10 sun4u sparc SUNW,Sun-Fire-1280RComplete the software installation. Once it is done, go back to the previous window, and stop the script by pressing Ctrl-C