src/os/bsd/vm/attachListener_bsd.cpp

rev 4897 : 7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
Reviewed-by: duke

*** 435,444 ****
--- 435,466 ----
    thread->check_and_wait_while_suspended();
  
    return op;
  }
  
+ 
+ // Performs initialization at vm startup
+ // For BSD we remove any stale .java_pid file which could cause
+ // an attaching process to think we are ready to recieve on the
+ // domain socket before we are properly initialized
+ 
+ void AttachListener::vm_start() {
+   char fn[UNIX_PATH_MAX];
+   struct stat64 st;
+   int ret;
+ 
+   snprintf(fn, UNIX_PATH_MAX, "%s/.java_pid%d",
+            os::get_temp_directory(), os::current_process_id());
+   RESTARTABLE(::stat64(fn, &st), ret);
+   if (ret == 0) {
+     ret = ::unlink(fn);
+     if(ret == -1) {
+       debug_only(warning("failed to remove stale attach pid file at %s", fn));
+     }
+   }
+ }
+ 
  int AttachListener::pd_init() {
    JavaThread* thread = JavaThread::current();
    ThreadBlockInVM tbivm(thread);
  
    thread->set_suspend_equivalent();
*** 467,481 ****
  // or /tmp then this is the trigger to start the attach mechanism
  bool AttachListener::is_init_trigger() {
    if (init_at_startup() || is_initialized()) {
      return false;               // initialized at startup or already initialized
    }
!   char path[PATH_MAX + 1];
    int ret;
    struct stat st;
  
!   snprintf(path, PATH_MAX + 1, "%s/.attach_pid%d",
             os::get_temp_directory(), os::current_process_id());
    RESTARTABLE(::stat(path, &st), ret);
    if (ret == 0) {
      // simple check to avoid starting the attach mechanism when
      // a bogus user creates the file
--- 489,503 ----
  // or /tmp then this is the trigger to start the attach mechanism
  bool AttachListener::is_init_trigger() {
    if (init_at_startup() || is_initialized()) {
      return false;               // initialized at startup or already initialized
    }
!   char path[UNIX_PATH_MAX];
    int ret;
    struct stat st;
  
!   snprintf(path, UNIX_PATH_MAX, "%s/.attach_pid%d",
             os::get_temp_directory(), os::current_process_id());
    RESTARTABLE(::stat(path, &st), ret);
    if (ret == 0) {
      // simple check to avoid starting the attach mechanism when
      // a bogus user creates the file