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Takashi Yano e9c96f0a6d Cygwin: pipe: Avoid deadlock for non-cygwin writer. 
- As mentioned in commit message of the commit b531d6b0, if multiple
  writers including non-cygwin app exist, the non-cygwin app cannot
  detect pipe closure on the read side when the pipe is created by
  system account or the the pipe creator is running as service.
  This is because query_hdl which is held in write side also is a
  read end of the pipe, so the pipe is still alive for the non-cygwin
  app even after the reader is closed.

  To avoid this problem, this patch lets all processes in the same
  process group close query_hdl using newly introduced internal signal
  __SIGNONCYGCHLD when non-cygwin app is started.

  Addresses: https://cygwin.com/pipermail/cygwin/2022-March/251097.html
 		2022-04-02 01:03:15 +09:00
..
CVSChangeLogs.old
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cygserver Cygwin: Allow using CFLAGS also for C++ files 2021-08-26 22:21:53 +02:00
cygwin Cygwin: pipe: Avoid deadlock for non-cygwin writer. 2022-04-02 01:03:15 +09:00
doc Cygwin: update 3.4 release text 2022-03-01 16:27:10 +01:00
testsuite Cygwin: do not build MinGW testsuite/cygrun --with-cross-bootstrap 2022-01-10 09:59:08 -05:00
utils Cygwin: Fix gmondump formatting goofs 2022-03-17 10:14:23 +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 winsup: disable fortify source 2022-03-16 22:03:33 -04:00
autogen.sh Cygwin: autogen.sh: Allow running from any directory 2021-05-06 10:56:20 +02:00
configure.ac Cygwin: Fix configure help for --{en,dis}able-doc option 2022-01-19 13:00:42 +00:00

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
You might especially be interested in

https://cygwin.com/faq/faq.html#faq.programming.building-cygwin