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Date: Tue, 25 Jul 2017 21:48:01 +0000 (UTC)
From: "Ian Lambert via cygwin" <cygwin AT cygwin DOT com>
Reply-To: Ian Lambert <ian DOT lambert_42 AT yahoo DOT com>
Reply-To: Ian Lambert <ian DOT lambert_42 AT yahoo DOT com>
To: <cygwin AT cygwin DOT com>, <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Message-ID: <1036849022.821922.1501019281615@mail.yahoo.com>
Subject: Re: how to access and display apps that I've launched
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--------------------------------------------
On Tue, 7/25/17, Brian Inglis <> wrote:

 Subject: Re: how to access and display apps that I've launched
 To: cygwin
 Date: Tuesday, July 25, 2017, 3:57 PM
 
 On 2017-07-25 12:16, Achim Gratz
 wrote:
 > Brian Inglis writes:
 >> rebaselst uses touch -t 7001010000 ...
 - could be patched to 197001010000.
 > 
 > Could be, but touch is specified to assume
 "19" yhen YY=70 by POSIX, AFAIK.
 > 
 >> Is this affected
 by locale and by Windows regional date settings in
 Control
 >> Panel/Region/Formats
 tab/Additional settings... button/Date tab/Calendar
 >> group/When a two-digit year is
 entered, interpret it as a year between
 >> |(nnnn-99)| and [nnnn ^v] with the
 default values |1980| and [2079 ^v] i.e. from
 >> the start of the DOS epoch which
 postdates the Unix epoch 19700101, and could
 >> cause 70 to be interpreted as 2070.
 > 
 > That would be
 surprising since the expectation really is UNIX epoch
 when
 > we're talking about Cygwin. 
 In any case, the OP should easily be able
 > to test this at the shell prompt.
 
 I know POSIX says and my tests
 on current releases verify 1969-99, 2000-68, but
 could this be thrown off by localization
 interfering in some cases, as was
 /proc/loadavg, because a function started using
 locales?
 These files and related functions
 do not seem candidates to be affected by the
 recent patch for ls problems with symlinks, so
 BLODA blocking pre-1980 times?

= = =

There is a change to "invalid argument" 
somewhere from 1980 to 1979, 
but it also involves permissions.
Permission denied comes from the chmod 444 in /bin/rebaselst
I think. Otherwise with write permission touch gives invalid argument.
Either way, it changes the files to current date-time,
not an earlier time, when it fails.


$ for f in * ; do echo $f ; touch -t 198001010000 $f ; done
fullrebase.done
rebase_all
rebase_dyn
rebase_exe
rebase_lst
rebase_pkg
rebase_user
rebase_user_exe

$ for f in * ; do echo $f ; touch -t 197901010000 $f ; done
fullrebase.done
touch: setting times of 'fullrebase.done': Invalid argument
rebase_all
touch: setting times of 'rebase_all': Invalid argument
rebase_dyn
touch: cannot touch 'rebase_dyn': Permission denied
rebase_exe
touch: cannot touch 'rebase_exe': Permission denied
rebase_lst
touch: cannot touch 'rebase_lst': Permission denied
rebase_pkg
touch: cannot touch 'rebase_pkg': Permission denied
rebase_user
touch: cannot touch 'rebase_user': Permission denied
rebase_user_exe
touch: cannot touch 'rebase_user_exe': Permission denied

The "bad" part of strace of a file with write permission is:

 3524 fhandler_base::utimens_fs: incoming lastaccess 0x10EDB8D0 0x0
   86  285905 [main] touch 3524 seterrno_from_nt_status: /home/corinna/src/cygwin/cygwin-2.8.2/cygwin-2.8.2-1.x86_64/src/newlib-cygwin/winsup/cygwin/fhandler_disk_file.cc:1385 status 0xC000000D -> windows error 87
   30  285935 [main] touch 3524 geterrno_from_win_error: windows error 87 == errno 22
   22  285957 [main] touch 3524 futimens: -1 = futimens(0, 0xFFFFC950)
   22  285979 [main] touch 3524 close: close(0)
   23  286002 [main] touch 3524 fhandler_base::close: closing '/var/cache/rebase/rebase_all' handle 0x240
  178  286180 [main] touch 3524 close: 0 = close(0)
touch  558  286738 [main] touch 3524 write: 5 = write(2, 0xFFFFCC50, 5)
:   47  286785 [main] touch 3524 write: 1 = write(2, 0x180229941, 1)
    45  286830 [main] touch 3524 write: 1 = write(2, 0x180229935, 1)
setting times of   116  286946 [main] touch 3524 write: 17 = write(2, 0x100414923, 17)
'rebase_all'   38  286984 [main] touch 3524 write: 12 = write(2, 0x10041C080, 12)
:   106  287090 [main] touch 3524 write: 2 = write(2, 0x180229945, 2)
Invalid argument   41  287131 [main] touch 3524 write: 16 = write(2, 0x180229C60, 16)

  189  287320 [main] touch 3524 write: 1 = write(2, 0x1801FC9A7, 1)
  184  287504 [main] touch 3524 close: close(1)
   18  287522 [main] touch 3524 fhandler_base::close: closing '' handle 0x204
   17  287539 [main] touch 3524 close: 0 = close(1)
  211  287750 [main] touch 3524 close: close(2)
   19  287769 [main] touch 3524 fhandler_base::close: closing '' handle 0x200
   24  287793 [main] touch 3524 close: 0 = close(2)
  177  287970 [main] touch 3524 do_exit: do_exit (256), exit_state 1
   25  287995 [main] touch 3524 void: 0x0 = signal (20, 0x1)
   19  288014 [main] touch 3524 void: 0x0 = signal (1, 0x1)

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