gh-148575: Use /dev/fd/ to read the set of file descriptors on Cygwin (#148576)

diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index b7f39ea3d499e4cae355ae29b8053f6d683ce59a..9867f077faef7aa5c70b099d94ce53205f133151 100644 (file)
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -63,7 +63,7 @@
 # endif
 #endif
 
-#if defined(__FreeBSD__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__DragonFly__)
+#if defined(__CYGWIN__) || defined(__FreeBSD__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__DragonFly__)
 # define FD_DIR "/dev/fd"
 #else
 # define FD_DIR "/proc/self/fd"