$ISA is an environment variable that stands for Instruction Set Architecture. It allows 32- and 64-bit libraries to run together.
On Solaris 32-bit machines, $ISA is replaced by an empty string, while on 64-bit machines, it is replaced by the string “sparcv9”.
To use both 32- and 64-bit servers, place the 32-bit PAM module in a directory, and to place the 64-bit version in a subdirectory of this directory.
The entry in pam.conf should look similar to:
$ ls /usr/lib/security/pam_whatever.so.1 pam_whatever.so.1 -> /wherever/pam_whatever_32bits.so.1 $ ls /usr/lib/security/sparcv9/pam_whatever.so.1 pam_whatever.so.1 -> /wherever/pam_whatever_64bits.so.1 ase auth required /usr/lib/security/$ISA/pam_whatever.so.1
$ISA is the only variable allowed in pam.conf.
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