[perl #77672] avoid a file handle redirection race

With multiple threads (and Win32 fork() is implemented in terms of
threads), Win32's popen() code had a race condition where a different
thread could write to the stdout (or read from the stdin) handle setup
for a child process.

Avoid this by using the Win32 API to supply the I/O handles instead of
redirecting them in the current process.

1 files changed, 1 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index 46649619e3..e7d6b1d520 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -5472,6 +5472,7 @@ t/uni/upper.t			See if Unicode casing works
 t/uni/variables.t		See that the rules for variable names work
 t/uni/write.t			See if Unicode formats work
 t/win32/fs.t			Test Win32 link for compatibility
+t/win32/popen.t			Test for stdout races in backticks, etc
 t/win32/runenv.t		Test if Win* perl honors its env variables
 t/win32/signal.t		Test Win32 signal emulation
 t/win32/system.t		See if system works in Win*