From 0104faa2803775d4f1b2c1115f4b6a8025252041 Mon Sep 17 00:00:00 2001
From: Brian Aker <brian@tangent.org>
Date: Mon, 19 Nov 2007 19:19:40 -0800
Subject: [PATCH] Fixed thread issue on Linux with gethostbyname_r().

---
 ChangeLog               |  1 +
 configure.ac            |  2 +-
 lib/memcached_connect.c | 17 ++++++++++++++++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 022ee4ee..6bb0ee1c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,7 @@
     from memcached errors (aka convert ints to strings)
   * Fixed type in MEMCACHED_HOST_LOOKUP_FAILURE
   * Fixed bug where hostname might not be null terminated
+  * Moved to using gethostbyname_r() on Linux to solve thread safety issue
 
 0.9 Thu Nov 15 07:44:00 PST 2007
   * fix for when no servers are definied.
diff --git a/configure.ac b/configure.ac
index 71a8ba53..db73e65c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,5 +68,5 @@ fi
 
 AC_C_CONST
 AC_TYPE_SIZE_T
-AC_CHECK_HEADERS(limits.h syslimits.h)
+AC_CHECK_FUNC(gethostbyname_r, AC_DEFINE([HAVE_GETHOSTBYNAME_R], [], [Looking for gethostbyname_r]))
 AC_OUTPUT(Makefile src/Makefile tests/Makefile docs/Makefile lib/Makefile include/Makefile support/Makefile support/libmemcached.pc support/libmemcached.spec)
diff --git a/lib/memcached_connect.c b/lib/memcached_connect.c
index f323e79f..1a7cde16 100644
--- a/lib/memcached_connect.c
+++ b/lib/memcached_connect.c
@@ -10,16 +10,31 @@
 static memcached_return set_hostinfo(memcached_server_st *server)
 {
   struct hostent *h;
-
+#ifdef HAVE_GETHOSTBYNAME_R
+  struct hostent h_static;
+  char buffer[SMALL_STRING_LEN];
+  int tmp_error;
+
+  if (gethostbyname_r(server->hostname,
+                      &h_static, buffer, SMALL_STRING_LEN, 
+                      &h, &tmp_error))
+  {
+    WATCHPOINT_STRING(server->hostname);
+    WATCHPOINT_STRING(hstrerror(tmp_error));
+    return MEMCACHED_HOST_LOOKUP_FAILURE;
+  }
+#else
   if ((h= gethostbyname(server->hostname)) == NULL)
   {
     WATCHPOINT_STRING(server->hostname);
     WATCHPOINT_STRING(hstrerror(h_errno));
     return MEMCACHED_HOST_LOOKUP_FAILURE;
   }
+#endif
 
   server->servAddr.sin_family= h->h_addrtype;
   memcpy((char *) &server->servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
+
   server->servAddr.sin_port = htons(server->port);
 
   return MEMCACHED_SUCCESS;
-- 
2.30.2