[glibc] hurd: Make _hurd_intr_rpc_mach_msg avoid returning MACH_SEND_INTERRUPTED

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8f22e36238c94e2a89da624e03c224895f9dd691

commit 8f22e36238c94e2a89da624e03c224895f9dd691
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Tue Nov 14 02:03:35 2023 +0100

    hurd: Make _hurd_intr_rpc_mach_msg avoid returning MACH_SEND_INTERRUPTED
    
    When the given options do not include MACH_SEND_INTERRUPT,
    _hurd_intr_rpc_mach_msg (aka mach_msg) is not supposed to return
    MACH_SEND_INTERRUPTED.  In such a case we thus have to retry sending the
    message.
    
    This was observed to fix various occurrences of spurious
    "(ipc/send) interrupted" errors when running haskell programs.

Diff:
---
 hurd/intr-msg.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hurd/intr-msg.c b/hurd/intr-msg.c
index bc1f43d383..98f588f206 100644
--- a/hurd/intr-msg.c
+++ b/hurd/intr-msg.c
@@ -143,6 +143,12 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
 	     XXX */
 	  goto retry_receive;
 	}
+      if (!(option & MACH_SEND_INTERRUPT))
+	{
+	  option = user_option;
+	  timeout = user_timeout;
+	  goto message;
+	}
       /* FALLTHROUGH */
 
       /* These are the other codes that mean a pseudo-receive modified