8286869: unify os::dir_is_empty across posix platforms

Backport-of: 9ab29b6c07d0995127ba647b2eab1c694e236661

src/hotspot/os/aix/os_aix.cpp

@@ -2573,25 +2573,6 @@ bool os::message_box(const char* title, const char* message) {
   return buf[0] == 'y' || buf[0] == 'Y';
 }
 
-// Is a (classpath) directory empty?
-bool os::dir_is_empty(const char* path) {
-  DIR *dir = NULL;
-  struct dirent *ptr;
-
-  dir = opendir(path);
-  if (dir == NULL) return true;
-
-  /* Scan the directory */
-  bool result = true;
-  while (result && (ptr = readdir(dir)) != NULL) {
-    if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
-      result = false;
-    }
-  }
-  closedir(dir);
-  return result;
-}
-
 // This code originates from JDK's sysOpen and open64_w
 // from src/solaris/hpi/src/system_md.c
 

src/hotspot/os/bsd/os_bsd.cpp

@@ -2302,25 +2302,6 @@ int os::compare_file_modified_times(const char* file1, const char* file2) {
   return diff;
 }
 
-// Is a (classpath) directory empty?
-bool os::dir_is_empty(const char* path) {
-  DIR *dir = NULL;
-  struct dirent *ptr;
-
-  dir = opendir(path);
-  if (dir == NULL) return true;
-
-  // Scan the directory
-  bool result = true;
-  while (result && (ptr = readdir(dir)) != NULL) {
-    if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
-      result = false;
-    }
-  }
-  closedir(dir);
-  return result;
-}
-
 // This code originates from JDK's sysOpen and open64_w
 // from src/solaris/hpi/src/system_md.c
 

src/hotspot/os/linux/os_linux.cpp

@@ -4926,25 +4926,6 @@ bool os::message_box(const char* title, const char* message) {
   return buf[0] == 'y' || buf[0] == 'Y';
 }
 
-// Is a (classpath) directory empty?
-bool os::dir_is_empty(const char* path) {
-  DIR *dir = NULL;
-  struct dirent *ptr;
-
-  dir = opendir(path);
-  if (dir == NULL) return true;
-
-  // Scan the directory
-  bool result = true;
-  while (result && (ptr = readdir(dir)) != NULL) {
-    if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
-      result = false;
-    }
-  }
-  closedir(dir);
-  return result;
-}
-
 // This code originates from JDK's sysOpen and open64_w
 // from src/solaris/hpi/src/system_md.c
 

src/hotspot/os/posix/os_posix.cpp

@@ -236,6 +236,25 @@ int os::create_file_for_heap(const char* dir) {
   return fd;
 }
 
+// Is a (classpath) directory empty?
+bool os::dir_is_empty(const char* path) {
+  DIR *dir = NULL;
+  struct dirent *ptr;
+
+  dir = ::opendir(path);
+  if (dir == NULL) return true;
+
+  // Scan the directory
+  bool result = true;
+  while (result && (ptr = ::readdir(dir)) != NULL) {
+    if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
+      result = false;
+    }
+  }
+  ::closedir(dir);
+  return result;
+}
+
 static char* reserve_mmapped_memory(size_t bytes, char* requested_addr) {
   char * addr;
   int flags = MAP_PRIVATE NOT_AIX( | MAP_NORESERVE ) | MAP_ANONYMOUS;