Plan 9のお話

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2009-02-10 第20回グリーオープンソーステクノロジー勉強会

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Plan 9のお話

  1. 1. oraccha@Plan9 2010 2 10
  2. 2. • Plan 9 OS • • Plan 9 • Plan 9 (@go_vm )
  3. 3. Plan 9 UNIX OS Phil Winterbottom Dave Presotto Dennis Ritchie Rob Pike 1995
  4. 4. Plan 9 UNIX OS Phil Winterbottom Jim McKie Dave Presotto Dennis Ritchie Rob Pike 1995 2004
  5. 5. Plan 9 Google • Rob Pike Ken Thompson Russ Cox Google Plan 10 Plan 9 Plan 11? Google OS http://undergoogle.com/tools/GoogleMasterPlanEN.html
  6. 6. Gopher Glen and Glenda Illustrated by Renée French
  7. 7. Plan 9 “Not only is UNIX dead, it’s starting to smell really bad.” -- Rob Pike, 1991
  8. 8. UNIX Plan 9 “the most dangerous enemy of a better solution is an existing codebase that is just good enough” -- Eric Raymond, “The art of UNIX Programming” Linux Plan 9 @IT (2009)
  9. 9. UNIX • proc • • • rfork clone • • • UTF-8
  10. 10. OS Plan 9 ! =@ DAHAIE@AJ MHIJ=JEI H 2+I ?=A@ JAHE=I E 2= ' JAHECO .ECKHA IDMIJDA=HH=CAAJ 6AH 1JAHAJ 6AH 6AH 6AH WS or PC /=JAM=O -JDAHAJ WORM jukebox .EA +27 +27 .EA /=JAM=O .EAHAJMH ,=J=EJ SMP 6AH 6AH 6AH Rob Pike, “Plan 9 from Bell Labs” (1995) +27 IAHLAHI =@ BEA IAHLAHI ID=HA B=IJ ?==HA=
  11. 11. Plan 9 • • 9P •
  12. 12. • • open-read-write-close
  13. 13. ... UNIX UNIX • GUI • X MIT • • UCB
  14. 14. • UNIX O /dev/tty, /proc X network interface, X window system • Plan 9 O /dev/cons, /proc, network interface, rio window system, http, ftp, environment variable X
  15. 15. • /dev/screen • /dev/window /dev/wsys/*/window •
  16. 16. rio • /dev/^(cons mouse window) app. app. rio read /dev/mouse app. User read /dev/mouse Kernel #s #m
  17. 17. /net • net ether0 tcp udp cs dns 0 1 clone stats ctl data err listen local remote status
  18. 18. /net/tcp • /net/tcp/N • ctl • data • /net/tcp/clone % lc /net/tcp 0 1 10 ... clone stats % lc /net/tcp/0 ctl data err listen local remote status
  19. 19. echo terminal 1: % cat /net/tcp/clone open(“/net/tcp/clone”) open 5 (“/net/tcp/*/ctl”) % cat /net/tcp/clone connect 192.168.182.130!7 terminal 2: % cat /net/tcp/5/data % echo hoge /net/tcp/5/data echo
  20. 20. echo • listen UNIX inetd • stdio % aux/listen1 -t tcp!*!7 /bin/service/tcp7 % cat /bin/service/tcp7 #!/bin/rc /bin/cat
  21. 21. tcpdump #!/bin/rc clonefile=/net/ether0/clone [4] $clonefile { netdir=`{basename -d $clonefile} ^ / ^ `{cat /fd/4} echo connect -1 $netdir/ctl || exit 'cannot connect' cat $netdir/data | xd -u -x2 }
  22. 22. API • open-read-write-close Plan 9 ioctl • BSD •
  23. 23. echo int fd, n; char *name; name = netmkaddr(“plan9.bell-labs.com”, “tcp”, “echo”); “204.178.31.2!echo fd = dial(name, 0, 0, 0); : n = write(fd, buf, sizeof(buf)); read(1, buf, n);
  24. 24. echo int acfd, lcfd, dfd, n; char adir[40], ldir[40] /net/tcp/5 acfd = announce(tcp!*!7, adir); for (;;) { /net/tcp/6 lcfd = listen(adir, ldir); switch (fork()) { UNIX case 0: dfd = accept(lcfd, ldir); while ((n = read(dfd, buf, sizeof(buf))) 0) write(dfd, buf, n); exits(0); } }
  25. 25. BSD Plan 9 BSD socket dial active open fd socket announce passive open fd dial connect active open - bind announce listen listen/accept accept reject close - shutdown
  26. 26. UNIX I/O Plan 9 • •
  27. 27. Plan 9 • • +fossil • Go Plan 9 wiki! http://plan9.bell-labs.com/wiki/plan9/
  28. 28. • i386 AMD64 ARM PowerPC ... • KVM QEMU Virtual Box VMWare Xen lguest •
  29. 29. UNIX Plan 9 • Plan9port • Plan 9 UNIX • 9vx • a.out • Plan 9 • Glandix • Linux
  30. 30. drawterm • UNIX Plan 9 CPU • /mnt/term mount
  31. 31. • kencc: ANSI C • acme: • acid: • APE: POSIX
  32. 32. kencc: compiler assembler loader SPARC kc ka kl Power PC qc qa ql MIPS (BE) vc va vl MIPS (LE) 0c 0a 0l Motorola 68000 1c 1a 1l Motorola 68020 2c 2a 2l ARM (LE) 5c 5a 5l AMD64 Intel 960 6c 6a 6l DEC Alpha 7c 7a 7l Intel 386 8c 8a 8l AMD 29000 9c 9a 9l
  33. 33. acme:
  34. 34. man emacs(1) EMACS(1) NAME emacs - editor macros SYNOPSIS emacs [ options ] DESCRIPTION This page intentionally left blank. SOURCE MIT SEE ALSO sam(1), vi(1) BUGS Yes.
  35. 35. Hello, World! % cat hello.c #include u.h #include libc.h void main() { print(“Hello, World!n”); exits(nil); } % 8c hello.c % 8l -o hello hello.8 % hello
  36. 36. % cat hello.c #include u.h #include libc.h void main() { print(“Hello, World!n”); exits(nil); } % 8c hello.c % 8l -o hello hello.8 % hello
  37. 37. ANSI C/POSIX % cat hello.c #include u.h #include libc.h void main() { print(“Hello, World!n”); exits(nil); } % 8c hello.c % 8l -o hello hello.8 % hello
  38. 38. % cat hello.c #include u.h #include libc.h void main() include/libc.h: { 1: #pragma lib “libc.a” print(“Hello, World!n”); 2: #pragma src “/sys/src/libc” exits(nil); } % 8c hello.c % 8l -o hello hello.8 % hello
  39. 39. ./hello % cat hello.c #include u.h #include libc.h void main() { print(“Hello, World!n”); exits(nil); } % 8c hello.c % 8l -o hello hello.8 % hello
  40. 40. % ls /env '*' boottime 'fn#sigexit' pid terminal 0 cflag font prompt timezone NPROC cputype fs rcname user apid ether0 home rootdir wctl auth facedom ifs service wsys bootargs fileserver objtype status bootfile 'fn#cpu%' path sysname % cat /env/path ./bin
  41. 41. • /bin % ns | grep /bin bind /386/bin /bin bind -a /rc/bin /bin bind -a /usr/oraccha/bin/rc /bin bind -a /usr/oraccha/bin/386 /bin ※Linux aufs unionfs
  42. 42. • % foo foo 151: suicide: sys: trap: page fault pc=0x00001025 % ps | grep foo glenda 151 0:00 0:00 8K Broken foo • acid(1) % acid 151 /proc/151/text: 386 plan 9 executable : acid: stk() • /proc import
  43. 43. FAQ • • • Ctrl-C • UNIX • OS • • create • •
  44. 44. Plan 9 An army of Glendas take over IBM’s Blue Gene!!
  45. 45. • 2/23 VM IIJ • Plan 9 • 3 Plug 9 @ Plan 9
  46. 46. Plan9 http://d.hatena.ne.jp/oraccha/ @glenda9p
  47. 47. Plan 9 “Narrowness of experience leads to narrowness of imagination..” -- Rob Pike, “Systems Software Research is Irrelevant”, 2000
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