1PER_LINUX 0 2PER_LINUX_32BIT ADDR_LIMIT_32BIT 3PER_LINUX_FDPIC FDPIC_FUNCPTRS 4PER_SVR4 (0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO) 5PER_SVR3 (0x0002 | STICKY_TIMEOUTS | SHORT_INODE) 6PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE) 7PER_OSR5 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS) 8PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS | SHORT_INODE) 9PER_ISCR4 (0x0005 | STICKY_TIMEOUTS) 10PER_BSD 0x0006 11PER_SUNOS (0x0006 | STICKY_TIMEOUTS) 12PER_XENIX (0x0007 | STICKY_TIMEOUTS | SHORT_INODE) 13PER_LINUX32 0x0008 14PER_LINUX32_3GB (0x0008 | ADDR_LIMIT_3GB) 15PER_IRIX32 (0x0009 | STICKY_TIMEOUTS) 16PER_IRIXN32 (0x000a | STICKY_TIMEOUTS) 17PER_IRIX64 (0x000b | STICKY_TIMEOUTS) 18PER_RISCOS 0x000c 19PER_SOLARIS (0x000d | STICKY_TIMEOUTS) 20PER_UW7 (0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO) 21PER_OSF4 0x000f 22PER_HPUX 0x0010 23PER_MASK 0x00ff 24