For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
Command output is similar to the following:
$ prctl -n process.max-file-descriptor $$
process: 110453: -sh
NAME    PRIVILEGE       VALUE    FLAG   ACTION       RECIPIENT
process.max-file-descriptor
        basic             256       -   deny            11731
        privileged      65.5K       -   deny                 -
        system          2.15G     max   deny