[newlib-cygwin] Cygwin: pipe: Restore blocking mode for cygwin process at startup.

[newlib-cygwin] Cygwin: pipe: Restore blocking mode for cygwin process at startup.

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=90788821b7d8f48e7f5e31fed68e54856a97b577

commit 90788821b7d8f48e7f5e31fed68e54856a97b577
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Wed Nov 17 17:08:05 2021 +0900

    Cygwin: pipe: Restore blocking mode for cygwin process at startup.
    
    - Set blocking mode properly at startup of cygwin process. This is
      needed if the cygwin process is executed from non-cygwin process.

Diff:
---
 winsup/cygwin/dtable.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/winsup/cygwin/dtable.cc b/winsup/cygwin/dtable.cc
index d57cbb355..e54db4446 100644
--- a/winsup/cygwin/dtable.cc
+++ b/winsup/cygwin/dtable.cc
@@ -410,6 +410,9 @@ dtable::init_std_file_from_handle (int fd, HANDLE handle)
 	{
 	  fhandler_pipe *fhp = (fhandler_pipe *) fh;
 	  fhp->set_pipe_buf_size ();
+	  /* Set read pipe always to nonblocking */
+	  fhp->set_pipe_non_blocking (fhp->get_device () == FH_PIPER ?
+				      true : fhp->is_nonblocking ());
 	}
 
       if (!fh->open_setup (openflags))