7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined

Summary: Change get_temp_directory() back to /tmp and %TEMP% like it always was and where the tools expect it to be.
Reviewed-by: phh, dcubed, kamg, alanb

src/os/linux/vm/os_linux.cpp

@@ -1610,10 +1610,9 @@ int os::current_process_id() {
 
 const char* os::dll_file_extension() { return ".so"; }
 
-const char* os::get_temp_directory() {
-  const char *prop = Arguments::get_property("java.io.tmpdir");
-  return prop == NULL ? "/tmp" : prop;
-}
+// This must be hard coded because it's the system's temporary
+// directory not the java application's temp directory, ala java.io.tmpdir.
+const char* os::get_temp_directory() { return "/tmp"; }
 
 static bool file_exists(const char* filename) {
   struct stat statbuf;

src/os/solaris/vm/os_solaris.cpp

@@ -1884,10 +1884,9 @@ void os::set_error_file(const char *logfile) {}
 
 const char* os::dll_file_extension() { return ".so"; }
 
-const char* os::get_temp_directory() {
-  const char *prop = Arguments::get_property("java.io.tmpdir");
-  return prop == NULL ? "/tmp" : prop;
-}
+// This must be hard coded because it's the system's temporary
+// directory not the java application's temp directory, ala java.io.tmpdir.
+const char* os::get_temp_directory() { return "/tmp"; }
 
 static bool file_exists(const char* filename) {
   struct stat statbuf;

src/os/windows/vm/os_windows.cpp

@@ -1044,9 +1044,9 @@ os::closedir(DIR *dirp)
     return 0;
 }
 
+// This must be hard coded because it's the system's temporary
+// directory not the java application's temp directory, ala java.io.tmpdir.
 const char* os::get_temp_directory() {
-  const char *prop = Arguments::get_property("java.io.tmpdir");
-  if (prop != 0) return prop;
   static char path_buf[MAX_PATH];
   if (GetTempPath(MAX_PATH, path_buf)>0)
     return path_buf;

src/share/vm/utilities/vmError.cpp

@@ -874,11 +874,13 @@ void VMError::report_and_die() {
       }
 
       if (fd == -1) {
-        // try temp directory
         const char * tmpdir = os::get_temp_directory();
-        jio_snprintf(buffer, sizeof(buffer), "%s%shs_err_pid%u.log",
-                     tmpdir, os::file_separator(), os::current_process_id());
-        fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+        // try temp directory if it exists.
+        if (tmpdir != NULL && tmpdir[0] != '\0') {
+          jio_snprintf(buffer, sizeof(buffer), "%s%shs_err_pid%u.log",
+                       tmpdir, os::file_separator(), os::current_process_id());
+          fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+        }
       }
 
       if (fd != -1) {