The DTrace library file /usr/lib/dtrace/procfs.d provides a set of translators for use in your D programs to translate from the operating system kernel implementation structures for processes and threads to the stable proc ( 4 ) structures psinfo and lwpsinfo. These structures are also used in the Solaris /proc filesystem files /proc/ pid /psinfo and /proc/ pid /lwps/ lwpid /lwpsinfo, and are defined in the system header file /usr/include/sys/procfs.h. These structures define useful Stable information about processes and threads such as the process ID, LWP ID, initial arguments, and other data displayed by the ps ( 1 ) command. Refer to proc ( 4 ) for a complete description of the struct members and semantics.