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Takashi Yano b160b690b6 Cygwin: console: Fix a race issue between close() and open(). 
The open() call for console sometimes fails if the console owner
process is closing the console by close() at the same time. This
is due to mismatch state of con.owner variable and attaching state
to the console. With this patch, checking con.owner and attaching
to con.owner sequence in open(), and resetting con.owner and freeing
console sequence in close() are guarded by output_mutex to avoid
such a race issue.
Addresses: https://cygwin.com/pipermail/cygwin/2024-March/255575.html

Fixes: 3721a756b0 ("Cygwin: console: Make the console accessible from other terminals.")
Reported-by: Kate Deplaix <kit-ty-kate@outlook.com>
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
 		2024-03-04 11:58:09 +09:00
..
CVSChangeLogs.old
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cygserver Revert "sys/types.h: Don't include sys/_stdint.h" 2022-05-04 15:08:44 +02:00
cygwin Cygwin: console: Fix a race issue between close() and open(). 2024-03-04 11:58:09 +09:00
doc Cygwin: newgrp: only allow group from supplementary group list 2024-02-24 13:08:34 +01:00
testsuite Cygwin: remove warnings from testsuite build 2024-01-19 15:11:32 +01:00
utils Cygwin: newgrp: only allow group from supplementary group list 2024-02-24 13:08:34 +01:00
CONTRIBUTORS Cygwin: Add Ben Wijen to list of contributors 2021-01-18 12:01:19 +01:00
COPYING
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COPYING.LIB
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CYGWIN_LICENSE
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Makefile.am Cygwin: Conditionally build documentation 2021-12-17 22:28:16 +00:00
Makefile.am.common Cygwin: automake: change @INCLUDES@ to @AM_CPPFLAGS@ to avoid warnings 2021-04-29 11:28:14 +02:00
README
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acinclude.m4 Cygwin: Reorganize cygwin source dir 2022-08-05 12:02:11 +02:00
autogen.sh Cygwin: autogen.sh: Allow running from any directory 2021-05-06 10:56:20 +02:00
configure.ac Cygwin: testsuite: Drop using DejaGnu to run tests 2023-07-22 17:16:37 +01:00

README 

THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Cygwin documentation is available on the net at https://cygwin.com
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https://cygwin.com/faq/faq.html#faq.programming.building-cygwin