Solaris::Kvm - Perl interface to Solaris Kernel Virtual Memory Access Library (libkvm)
use Solaris::Kvm; $handle = new Solaris::Kvm(); printf "value of maxusers %d\n", $handle->maxusers; printf "size of maxusers variable %d\n", $handle->size('maxusers');
Solaris::Kvm allows read access to Solaris kernel variables through the tied hash interface. By default, the module reads the /dev/ksyms namelist, but it is also possible to use an alternative namelist by passing its name to the module constructor:
$handle = new Solaris::Kvm("/my_namelist");
The value of a particular kernel variable can by looked up by simply retrieving the element from the hash using the name of the variable as a key:
printf "maxusers: %d\n", $handle->{maxusers};
Note, the value is automatically refreshed for every lookup - i.e. internally, the FETCH routine calls kvm_kread(). Variable value can also be retrieved using the subroutine/method syntax:
printf "maxusers: %d\n", $handle->maxusers;
although, it is slightly less efficient since such call is dispatched through the AUTOLOAD function. In addition to reading the values of kernel variables, the module is capable of providing the size of a variable (in bytes), its type (object, function, etc) as well as its bind (local, global, etc) and visibility (internal, protected, etc):
printf "maxusers size: %d\n", $handle->size('maxusers'); printf "maxusers type: %d\n", $handle->type('maxusers'); printf "maxusers bind: %d\n", $handle->bind('maxusers'); printf "maxusers visibility: %d\n", $handle->visibility('maxusers');
All these functions return standard ELF constants (STT_OBJECT, STT_HIDDEN, etc), defined in elf.h. The "write" function is disabled - those who wish to modify the values of kernel variables should really use /etc/system...;-).
STB_GLOBAL STB_WEAK STB_NUM STT_NOTYPE STT_OBJECT STT_FUNC STT_SECTION STT_FILE STT_COMMON STT_TLS STT_NUM STV_DEFAULT STV_INTERNAL STV_HIDDEN STV_PROTECTED
Alexander Golomshtok<lt>golomshtok_alexander@jpmorgan.com<gt>
libkvm(3LIB), perl.
To install Solaris::Kvm, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Solaris::Kvm
CPAN shell
perl -MCPAN -e shell install Solaris::Kvm
For more information on module installation, please visit the detailed CPAN module installation guide.