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