[hurd] 21/23: Make netfs_S_io_reauthenticate handle allocation errors

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 1fa0cec1b643483918933b5d6a419e77d6e16c6d
Author: Samuel Thibault <address@hidden>
Date:   Sun Oct 11 22:14:18 2015 +0200

    Make netfs_S_io_reauthenticate handle allocation errors
    
    * libnetfs/io-reauthenticate.c (netfs_S_io_reauthenticate): Loop when
    netfs_make_protid fails with EINTR, return error when it fails otherwise.
---
 libnetfs/io-reauthenticate.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/libnetfs/io-reauthenticate.c b/libnetfs/io-reauthenticate.c
index 9192813..8ff4182 100644
--- a/libnetfs/io-reauthenticate.c
+++ b/libnetfs/io-reauthenticate.c
@@ -31,8 +31,18 @@ netfs_S_io_reauthenticate (struct protid *user, mach_port_t 
rend_port)
   if (!user)
     return EOPNOTSUPP;
 
+  /* This routine must carefully ignore EINTR because we
+     are a simpleroutine, so callers won't know to restart. */
+
   pthread_mutex_lock (&user->po->np->lock);
-  newpi = netfs_make_protid (user->po, 0);
+  do
+    newpi = netfs_make_protid (user->po, 0);
+  while (! newpi && errno == EINTR);
+  if (! newpi)
+    {
+      pthread_mutex_unlock (&user->po->np->lock);
+      return errno;
+    }
 
   newright = ports_get_send_right (newpi);
   assert (newright != MACH_PORT_NULL);

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