[PATCH] Cygwin: FIFO: avoid hang after exec
Ken Brown
kbrown@cornell.edu
Thu Apr 18 15:39:00 GMT 2019
Define fhandler:fifo::fixup_after_exec, which sets listen_client_thr
and lct_termination_evt to NULL. This forces the listen_client thread
to restart on the first attempt to read after an exec. Previously the
exec'd process could hang in fhandler_fifo::raw_read.
---
winsup/cygwin/fhandler.h | 1 +
winsup/cygwin/fhandler_fifo.cc | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 8fb176b24..da007ee45 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -1301,6 +1301,7 @@ public:
ssize_t __reg3 raw_write (const void *ptr, size_t ulen);
bool arm (HANDLE h);
void fixup_after_fork (HANDLE);
+ void fixup_after_exec ();
int __reg2 fstatvfs (struct statvfs *buf);
void clear_readahead ()
{
diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index 1d02adbaa..bc9c23998 100644
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -942,6 +942,15 @@ fhandler_fifo::fixup_after_fork (HANDLE parent)
fifo_client_unlock ();
}
+void
+fhandler_fifo::fixup_after_exec ()
+{
+ fhandler_base::fixup_after_exec ();
+ listen_client_thr = NULL;
+ lct_termination_evt = NULL;
+ fifo_client_unlock ();
+}
+
void
fhandler_fifo::set_close_on_exec (bool val)
{
--
2.17.0
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