Merge branch 'baseline' into refs/top-bases/tschwinge/Roger_Whittaker

Conflicts:
	configure
	configure.in
	elf/rtld.c
	misc/syslog.c
	sysdeps/gnu/configure
	sysdeps/gnu/configure.in
	sysdeps/mach/hurd/accept4.c
	sysdeps/mach/hurd/bits/posix_opt.h
	sysdeps/mach/hurd/dup3.c
	sysdeps/mach/hurd/i386/init-first.c
	sysdeps/mach/hurd/kernel-features.h
	sysdeps/mach/hurd/readlinkat.c

2 files changed, 103 insertions, 20 deletions

diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index 10aecb8604..a924d40844 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996-2004, 2007-2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 1996-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -744,6 +744,10 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
 
       if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME)
 	{
+	  /* A CNAME could also have a TTL entry.  */
+	  if (ttlp != NULL && ttl < *ttlp)
+	      *ttlp = ttl;
+
 	  if (ap >= &host_data->aliases[MAX_NR_ALIASES - 1])
 	    continue;
 	  n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf);
@@ -905,7 +909,10 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
 	    {
 	      register int nn;
 
-	      if (ttlp != NULL)
+	      /* We compose a single hostent out of the entire chain of
+	         entries, so the TTL of the hostent is essentially the lowest
+		 TTL in the chain.  */
+	      if (ttlp != NULL && ttl < *ttlp)
 		*ttlp = ttl;
 	      if (canonp != NULL)
 		*canonp = bp;
@@ -1081,6 +1088,11 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
       if (type == T_CNAME)
 	{
 	  char tbuf[MAXDNAME];
+
+	  /* A CNAME could also have a TTL entry.  */
+	  if (ttlp != NULL && ttl < *ttlp)
+	      *ttlp = ttl;
+
 	  n = dn_expand (answer->buf, end_of_message, cp, tbuf, sizeof tbuf);
 	  if (__builtin_expect (n < 0 || res_hnok (tbuf) == 0, 0))
 	    {
@@ -1161,7 +1173,10 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
 
       if (*firstp)
 	{
-	  if (ttlp != NULL)
+	  /* We compose a single hostent out of the entire chain of
+	     entries, so the TTL of the hostent is essentially the lowest
+	     TTL in the chain.  */
+	  if (ttlp != NULL && ttl < *ttlp)
 	    *ttlp = ttl;
 
 	  (*pat)->name = canon ?: h_name;
diff --git a/resolv/res_send.c b/resolv/res_send.c
index a001c1e753..0a28cd784b 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -1013,8 +1013,9 @@ send_dg(res_state statp,
 		seconds /= statp->nscount;
 	if (seconds <= 0)
 		seconds = 1;
-	bool single_request = (statp->options & RES_SNGLKUP) != 0;
 	bool single_request_reopen = (statp->options & RES_SNGLKUPREOP) != 0;
+	bool single_request = (((statp->options & RES_SNGLKUP) != 0)
+			       | single_request_reopen);
 	int save_gotsomewhere = *gotsomewhere;
 
 	int retval;
@@ -1100,24 +1101,91 @@ send_dg(res_state statp,
 	}
 	__set_errno (0);
 	if (pfd[0].revents & POLLOUT) {
-		ssize_t sr;
-		if (nwritten != 0)
-		  sr = send (pfd[0].fd, buf2, buflen2, MSG_NOSIGNAL);
-		else
-		  sr = send (pfd[0].fd, buf, buflen, MSG_NOSIGNAL);
+#ifndef __ASSUME_SENDMMSG
+		static int have_sendmmsg;
+#else
+# define have_sendmmsg 1
+#endif
+		if (have_sendmmsg >= 0 && nwritten == 0 && buf2 != NULL
+		    && !single_request)
+		  {
+		    struct iovec iov[2];
+		    struct mmsghdr reqs[2];
+		    reqs[0].msg_hdr.msg_name = NULL;
+		    reqs[0].msg_hdr.msg_namelen = 0;
+		    reqs[0].msg_hdr.msg_iov = &iov[0];
+		    reqs[0].msg_hdr.msg_iovlen = 1;
+		    iov[0].iov_base = (void *) buf;
+		    iov[0].iov_len = buflen;
+		    reqs[0].msg_hdr.msg_control = NULL;
+		    reqs[0].msg_hdr.msg_controllen = 0;
+
+		    reqs[1].msg_hdr.msg_name = NULL;
+		    reqs[1].msg_hdr.msg_namelen = 0;
+		    reqs[1].msg_hdr.msg_iov = &iov[1];
+		    reqs[1].msg_hdr.msg_iovlen = 1;
+		    iov[1].iov_base = (void *) buf2;
+		    iov[1].iov_len = buflen2;
+		    reqs[1].msg_hdr.msg_control = NULL;
+		    reqs[1].msg_hdr.msg_controllen = 0;
+
+		    int ndg = sendmmsg (pfd[0].fd, reqs, 2, MSG_NOSIGNAL);
+		    if (__builtin_expect (ndg == 2, 1))
+		      {
+			if (reqs[0].msg_len != buflen
+			    || reqs[1].msg_len != buflen2)
+			  goto fail_sendmmsg;
 
-		if (sr != buflen) {
-			if (errno == EINTR || errno == EAGAIN)
-				goto recompute_resend;
-			Perror(statp, stderr, "send", errno);
+			pfd[0].events = POLLIN;
+			nwritten += 2;
+		      }
+		    else if (ndg == 1 && reqs[0].msg_len == buflen)
+		      goto just_one;
+		    else if (ndg < 0 && (errno == EINTR || errno == EAGAIN))
+		      goto recompute_resend;
+		    else
+		      {
+#ifndef __ASSUME_SENDMMSG
+			if (__builtin_expect (have_sendmmsg == 0, 0))
+			  {
+			    if (ndg < 0 && errno == ENOSYS)
+			      {
+				have_sendmmsg = -1;
+				goto try_send;
+			      }
+			    have_sendmmsg = 1;
+			  }
+#endif
+
+		      fail_sendmmsg:
+			Perror(statp, stderr, "sendmmsg", errno);
 			goto err_out;
-		}
-		if (nwritten != 0 || buf2 == NULL
-		    || single_request || single_request_reopen)
-		  pfd[0].events = POLLIN;
+		      }
+		  }
 		else
-		  pfd[0].events = POLLIN | POLLOUT;
-		++nwritten;
+		  {
+		    ssize_t sr;
+#ifndef __ASSUME_SENDMMSG
+		  try_send:
+#endif
+		    if (nwritten != 0)
+		      sr = send (pfd[0].fd, buf2, buflen2, MSG_NOSIGNAL);
+		    else
+		      sr = send (pfd[0].fd, buf, buflen, MSG_NOSIGNAL);
+
+		    if (sr != (nwritten != 0 ? buflen2 : buflen)) {
+		      if (errno == EINTR || errno == EAGAIN)
+			goto recompute_resend;
+		      Perror(statp, stderr, "send", errno);
+		      goto err_out;
+		    }
+		  just_one:
+		    if (nwritten != 0 || buf2 == NULL || single_request)
+		      pfd[0].events = POLLIN;
+		    else
+		      pfd[0].events = POLLIN | POLLOUT;
+		    ++nwritten;
+		  }
 		goto wait;
 	} else if (pfd[0].revents & POLLIN) {
 		int *thisanssizp;
@@ -1327,7 +1395,7 @@ send_dg(res_state statp,
 			recvresp2 = 1;
 		/* Repeat waiting if we have a second answer to arrive.  */
 		if ((recvresp1 & recvresp2) == 0) {
-			if (single_request || single_request_reopen) {
+			if (single_request) {
 				pfd[0].events = POLLOUT;
 				if (single_request_reopen) {
 					__res_iclose (statp, false);