[glibc] hurd: Respect existing FD_CLOEXEC in S_msg_set_fd

[glibc] hurd: Respect existing FD_CLOEXEC in S_msg_set_fd

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=89f1e04174a6b6548d19f7f301ddcc8ab91d91df

commit 89f1e04174a6b6548d19f7f301ddcc8ab91d91df
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Sat Apr 29 16:13:53 2023 +0300

    hurd: Respect existing FD_CLOEXEC in S_msg_set_fd
    
    If the process has set the close-on-exec flag for the file descriptor,
    it expects the file descriptor to get closed on exec, even if we replace
    what the file descriptor refers to.
    
    Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
    Message-Id: <20230429131354.2507443-6-bugaevc@gmail.com>

Diff:
---
 hurd/hurdmsg.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hurd/hurdmsg.c b/hurd/hurdmsg.c
index 896fb87cfa..8fde1f535d 100644
--- a/hurd/hurdmsg.c
+++ b/hurd/hurdmsg.c
@@ -323,7 +323,13 @@ _S_msg_set_fd (mach_port_t msgport, mach_port_t auth,
   AUTHCHECK;
 
   /* We consume the reference if successful.  */
-  err = HURD_FD_USE (which, (_hurd_port2fd (descriptor, port, 0), 0));
+  err = HURD_FD_USE (which,
+		     ({
+		       int flags = (descriptor->flags & FD_CLOEXEC)
+				   ? O_CLOEXEC : 0;
+		       _hurd_port2fd (descriptor, port, flags);
+		       0;
+		     }));
   if (err)
     return err;