---
- branch: MAIN
  date: Sat May 13 03:26:03 UTC 2017
  files:
  - new: '1.140'
    old: '1.139'
    path: src/bin/sh/eval.c
    pathrev: src/bin/sh/eval.c@1.140
    type: modified
  - new: '1.21'
    old: '1.20'
    path: src/bin/sh/shell.h
    pathrev: src/bin/sh/shell.h@1.21
    type: modified
  - new: '1.39'
    old: '1.38'
    path: src/bin/sh/show.c
    pathrev: src/bin/sh/show.c@1.39
    type: modified
  - new: '1.10'
    old: '1.9'
    path: src/bin/sh/show.h
    pathrev: src/bin/sh/show.h@1.10
    type: modified
  id: 20170513T032603Z.180f8031e5048f15411584c069f788afabe49a58
  log: "The beginnings of the great shell DEBUG (tracing) upgrade of 2017...\n\nFirst,
    be aware that the DEBUG spoken of here has nothing whatever to\ndo with MKDEBUG=true
    type builds of NetBSD.   The only way to get a\nDEBUG shell is to build it yourself
    manually.\n\nThat said, for non-DEBUG shells, this change makes only one slight\n(trivial
    really) difference, which should affect nothing.\n\nPreviously some code was defined
    like ...\n\nfunction(args)\n{\n#ifdef DEBUG\n\t/* function code goes here */\n#endif\n}\n\nand
    called like ...\n\n#ifdef DEBUG\n\tfunction(params);\n#endif\n\nresulting in several
    empty functions that are never called being\ndefined in non-DEBUG shells.   Those
    are now gone.   If you can detect\nthe difference any way other than using \"nm\"
    or similar, I'd be very\nsurprised...\n\nFor DEBUG shells, this introduces a whole
    new TRACE() setup to use\nto assist in debugging the shell.\n\nI have had this
    locally (uncommitted) for over a year...  it helps.\n\nBy itself this change is
    almost useless, nothing really changes, but\nit provides the framework to allow
    other TRACE() calls to be updated\nover time.   This is why I had not committed
    this earlier, my previous\nversion required a flag day, with all the shell's internal
    tracing\nbeing updated a once - which I had done, but that shell version has\nbit-rotted
    so badly now it is almost useless...\n\nFuture updates will add the mechanism
    to allow the new stuff to actually\nbe used in a productive way, and following
    that, over time, gradual\nconversion of all the shell tracing to the updated form
    (as required,\nor when I am bored...)\n\nThe one useful change that we do get
    now is that the fd that the shell\nuses for tracing (which was usually 3, but
    not any more) is now protected\nfrom user/script interference, like all the other
    shell inernal fds.\n\nThere is no doc (nor will there be) on any of this, if you
    are not reading\nthe source code it is useless to you, if you are, you know how
    it works.\n"
  module: src
  subject: 'CVS commit: src/bin/sh'
  unixtime: '1494645963'
  user: kre