The functions unix_getParentPidAndTimings and unix_getCmdlineAndUserInfo in src/java.base/unix/native/libjava/ProcessHandleImpl_unix.c used to hold an implementation that was shared between Solaris and AIX. Linux and MacOS already had specific implementations. After the removal of the Solaris port, these two functions can be removed in favor of inline implementations of os_getParentPidAndTimings and os_getCmdlineAndUserInfo in src/java.base/aix/native/libjava/ProcessHandleImpl_aix.c.