src/hotspot/os/posix/os_posix.cpp

*** 174,184 ****
--- 174,198 ----
    // don't do anything on posix platforms
    return;
  }
  
  int os::create_file_for_heap(const char* dir) {
+   int fd;
  
+ #ifdef O_TMPFILE
+   char* native_dir = os::strdup(dir);
+   if (native_dir == NULL) {
+     vm_exit_during_initialization(err_msg("strdup failed during creation of backing file for heap (%s)", os::strerror(errno)));
+     return -1;
+   }
+   os::native_path(native_dir);
+   fd = os::open(dir, O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR);
+   os::free(native_dir);
+ 
+   if (fd == -1)
+ #endif
+   {
      const char name_template[] = "/jvmheap.XXXXXX";
  
      size_t fullname_len = strlen(dir) + strlen(name_template);
      char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
      if (fullname == NULL) {
*** 188,214 ****
    int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
    assert((size_t)n == fullname_len, "Unexpected number of characters in string");
  
    os::native_path(fullname);
  
-   // set the file creation mask.
-   mode_t file_mode = S_IRUSR | S_IWUSR;
- 
    // create a new file.
!   int fd = mkstemp(fullname);
  
    if (fd < 0) {
      warning("Could not create file for heap with template %s", fullname);
      os::free(fullname);
      return -1;
!   }
! 
    // delete the name from the filesystem. When 'fd' is closed, the file (and space) will be deleted.
    int ret = unlink(fullname);
    assert_with_errno(ret == 0, "unlink returned error");
  
    os::free(fullname);
    return fd;
  }
  
  static char* reserve_mmapped_memory(size_t bytes, char* requested_addr) {
    char * addr;
--- 202,227 ----
      int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
      assert((size_t)n == fullname_len, "Unexpected number of characters in string");
  
      os::native_path(fullname);
  
      // create a new file.
!     fd = mkstemp(fullname);
  
      if (fd < 0) {
        warning("Could not create file for heap with template %s", fullname);
        os::free(fullname);
        return -1;
!     } else {
        // delete the name from the filesystem. When 'fd' is closed, the file (and space) will be deleted.
        int ret = unlink(fullname);
        assert_with_errno(ret == 0, "unlink returned error");
+     }
  
      os::free(fullname);
+   }
+ 
    return fd;
  }
  
  static char* reserve_mmapped_memory(size_t bytes, char* requested_addr) {
    char * addr;