Diffs of the core OS man pages between #OracleSolaris 11.4.87 and 11.4.90 are at https://gist.github.com/alanc/cfbaa19eb1ee04afe996da97f121fe7e so you can see more about what changed in the software, as well as some of the documentation cleanups we did.

My big man page project for the quarter was a cleanup pass across the section 4m (kernel module) man pages.

Work continued on trying to prevent bugs that result in killing all processes on the system by mistake, in response to customers hitting https://github.com/sudo-project/sudo/issues/458 last year, and bugs in other programs using -1 as a pid value in kill() calls by mistake.

Previously, in #OracleSolaris 11.4.83, killpg() was made to reject the always invalid process group id of 1, instead of turning it into the "kill all processes" argument of -1 to kill().

Now in 11.4.90, the kill system call was modified to not allow processes to use a pid of -1 unless they'd specifically set a process flag that they intend to kill all processes first, to help with programs that didn't check for errors when finding the process id for the singular process they wanted to kill.

New utime32_t and utimeval32 types have been defined in the system headers in #OracleSolaris 11.4.90 for places where binary compatibility forces a 32-bit time value, but unsigned values can be used to represent times from 1970-2106 instead of the traditional signed 32-bit range of 1901-2038.

The bufmod(4m) interface was modified to use these, allowing snoop(8) to become #Y2038 safe (though still destined to fail in 2106). snoop also became a 64-bit program in this release.