[BZ #14889]

        * sunrpc/rpc/svc.h (__svc_accept_failed): New prototype.
        * sunrpc/svc.c: Include time.h.
        (__svc_accept_failed): New function.
        * sunrpc/svc_tcp.c (rendezvous_request): If the accept fails for
        any reason other than EINTR, call __svc_accept_failed.
        * sunrpc/svc_udp.c (svcudp_recv): Similarly.
        * sunrpc/svc_unix.c (rendezvous_request): Similarly.

5 files changed, 110 insertions, 2 deletions

diff --git a/sunrpc/rpc/svc.h b/sunrpc/rpc/svc.h
index 54d1ac14f1..58a5f7da95 100644
--- a/sunrpc/rpc/svc.h
+++ b/sunrpc/rpc/svc.h
@@ -1,6 +1,23 @@
 /*
  * svc.h, Server-side remote procedure call interface.
  *
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the GNU C Library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -316,4 +333,5 @@ extern SVCXPRT *svcunix_create (int __sock, u_int __sendsize, u_int __recvsize,
 
 __END_DECLS
 
+extern void __svc_accept_failed (void) attribute_hidden;
 #endif /* rpc/svc.h */
diff --git a/sunrpc/svc.c b/sunrpc/svc.c
index 103770a42c..736d4a974c 100644
--- a/sunrpc/svc.c
+++ b/sunrpc/svc.c
@@ -4,6 +4,23 @@
  * There are two sets of procedures here.  The xprt routines are
  * for handling transport handles.  The svc routines handle the
  * list of service routines.
+ *  Copyright (C) 2002-2012 Free Software Foundation, Inc.
+ *  This file is part of the GNU C Library.
+ *  Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+ *
+ *  The GNU C Library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  The GNU C Library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with the GNU C Library; if not, see
+ *  <http://www.gnu.org/licenses/>.
  *
  * Copyright (c) 2010, Oracle America, Inc.
  *
@@ -41,6 +58,7 @@
 #include <rpc/svc.h>
 #include <rpc/pmap_clnt.h>
 #include <sys/poll.h>
+#include <time.h>
 
 #ifdef _RPC_THREAD_SAFE_
 #define xports RPC_THREAD_VARIABLE(svc_xports_s)
@@ -544,6 +562,21 @@ svc_getreq_common (const int fd)
 }
 libc_hidden_nolink_sunrpc (svc_getreq_common, GLIBC_2_2)
 
+/* If there are no file descriptors available, then accept will fail.
+   We want to delay here so the connection request can be dequeued;
+   otherwise we can bounce between polling and accepting, never giving the
+   request a chance to dequeue and eating an enormous amount of cpu time
+   in svc_run if we're polling on many file descriptors.  */
+void
+__svc_accept_failed (void)
+{
+  if (errno == EMFILE)
+    {
+      struct timespec ts = { .tv_sec = 0, .tv_nsec = 50000000 };
+      __nanosleep (&ts, NULL);
+    }
+}
+
 #ifdef _RPC_THREAD_SAFE_
 
 void
diff --git a/sunrpc/svc_tcp.c b/sunrpc/svc_tcp.c
index eb615494d8..1fdb0ad2da 100644
--- a/sunrpc/svc_tcp.c
+++ b/sunrpc/svc_tcp.c
@@ -1,6 +1,23 @@
 /*
  * svc_tcp.c, Server side for TCP/IP based RPC.
  *
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the GNU C Library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -247,6 +264,7 @@ again:
     {
       if (errno == EINTR)
 	goto again;
+      __svc_accept_failed ();
       return FALSE;
     }
   /*
diff --git a/sunrpc/svc_udp.c b/sunrpc/svc_udp.c
index 6c4d75a814..3324e2a13e 100644
--- a/sunrpc/svc_udp.c
+++ b/sunrpc/svc_udp.c
@@ -3,6 +3,23 @@
  * Server side for UDP/IP based RPC.  (Does some caching in the hopes of
  * achieving execute-at-most-once semantics.)
  *
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the GNU C Library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -277,8 +294,12 @@ again:
 		       (int) su->su_iosz, 0,
 		       (struct sockaddr *) &(xprt->xp_raddr), &len);
   xprt->xp_addrlen = len;
-  if (rlen == -1 && errno == EINTR)
-    goto again;
+  if (rlen == -1)
+    {
+      if (errno == EINTR)
+	goto again;
+      __svc_accept_failed ();
+    }
   if (rlen < 16)		/* < 4 32-bit ints? */
     return FALSE;
   xdrs->x_op = XDR_DECODE;
diff --git a/sunrpc/svc_unix.c b/sunrpc/svc_unix.c
index 94507b2403..5c3184a5f5 100644
--- a/sunrpc/svc_unix.c
+++ b/sunrpc/svc_unix.c
@@ -1,6 +1,23 @@
 /*
  * svc_unix.c, Server side for TCP/IP based RPC.
  *
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the GNU C Library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ *
  * Copyright (c) 2010, Oracle America, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -244,6 +261,7 @@ again:
     {
       if (errno == EINTR)
 	goto again;
+      __svc_accept_failed ();
       return FALSE;
     }
   /*