HDFS-5365. Fix libhdfs compile error on FreeBSD9. Contributed by Radim Kolar.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1533283 13f79535-47bb-0310-9956-ffa450edef68

Author: cnauroth

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -369,6 +369,8 @@ Release 2.3.0 - UNRELEASED
     HDFS-5336. DataNode should not output 'StartupProgress' metrics.
     (Akira Ajisaka via cnauroth)
 
+    HDFS-5365. Fix libhdfs compile error on FreeBSD9. (Radim Kolar via cnauroth)
+
 Release 2.2.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/CMakeLists.txt

@@ -62,6 +62,11 @@ endfunction()
 INCLUDE(CheckCSourceCompiles)
 CHECK_C_SOURCE_COMPILES("int main(void) { static __thread int i = 0; return 0; }" HAVE_BETTER_TLS)
 
+# Check if we need to link dl library to get dlopen.
+# dlopen on Linux is in separate library but on FreeBSD its in libc
+INCLUDE(CheckLibraryExists)
+CHECK_LIBRARY_EXISTS(dl dlopen "" NEED_LINK_DL)
+
 find_package(JNI REQUIRED)
 if (NOT GENERATED_JAVAH)
     # Must identify where the generated headers have been placed
@@ -89,9 +94,13 @@ add_dual_library(hdfs
     main/native/libhdfs/jni_helper.c
     main/native/libhdfs/hdfs.c
 )
+if (NEED_LINK_DL)
+   set(LIB_DL dl)
+endif(NEED_LINK_DL)
+
 target_link_dual_libraries(hdfs
     ${JAVA_JVM_LIBRARY}
-    dl
+    ${LIB_DL}
     pthread
 )
 dual_output_directory(hdfs target/usr/local/lib)

hadoop-hdfs-project/hadoop-hdfs/src/main/native/util/posix_util.c

@@ -27,6 +27,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <limits.h>
 
 static pthread_mutex_t gTempdirLock = PTHREAD_MUTEX_INITIALIZER;