HelenOS sources

LOC_SERVICE_ADD_TO_CAT   53 uspace/lib/c/include/ipc/loc.h 	LOC_SERVICE_ADD_TO_CAT,
LOC_SERVICE_ADD_TO_CAT   53 uspace/lib/posix/include/libc/ipc/loc.h 	LOC_SERVICE_ADD_TO_CAT,
HelenOS homepage, sources at GitHub