# ./pullrev.sh 1738229

https://bugzilla.redhat.com/show_bug.cgi?id=1225116

As for mod_auth_digest, fix to use anonymous SHM by default.

http://svn.apache.org/viewvc?view=revision&revision=1738229

--- httpd-2.4.18/modules/lua/mod_lua.c
+++ httpd-2.4.18/modules/lua/mod_lua.c
@@ -83,6 +83,8 @@
     int broken;
 } lua_filter_ctx;
 
+#define DEFAULT_LUA_SHMFILE "lua_ivm_shm"
+
 apr_global_mutex_t *lua_ivm_mutex;
 apr_shm_t *lua_ivm_shm;
 char *lua_ivm_shmfile;
@@ -1995,7 +1997,6 @@
                              apr_pool_t *ptemp, server_rec *s)
 {
     apr_pool_t **pool;
-    const char *tempdir;
     apr_status_t rs;
 
     lua_ssl_val = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
@@ -2011,21 +2012,20 @@
         return HTTP_INTERNAL_SERVER_ERROR;
     }
 
-    /* Create shared memory space */
-    rs = apr_temp_dir_get(&tempdir, pconf);
-    if (rs != APR_SUCCESS) {
-        ap_log_error(APLOG_MARK, APLOG_ERR, rs, s, APLOGNO(02664)
-                 "mod_lua IVM: Failed to find temporary directory");
-        return HTTP_INTERNAL_SERVER_ERROR;
+    /* Create shared memory space, anonymous first if possible. */
+    rs = apr_shm_create(&lua_ivm_shm, sizeof pool, NULL, pconf);
+    if (APR_STATUS_IS_ENOTIMPL(rs)) {
+        /* Fall back to filename-based; nuke any left-over first. */
+        lua_ivm_shmfile = ap_runtime_dir_relative(pconf, DEFAULT_LUA_SHMFILE);
+
+        apr_shm_remove(lua_ivm_shmfile, pconf);
+        
+        rs = apr_shm_create(&lua_ivm_shm, sizeof pool, lua_ivm_shmfile, pconf);
     }
-    lua_ivm_shmfile = apr_psprintf(pconf, "%s/httpd_lua_shm.%ld", tempdir,
-                           (long int)getpid());
-    rs = apr_shm_create(&lua_ivm_shm, sizeof(apr_pool_t**),
-                    (const char *) lua_ivm_shmfile, pconf);
     if (rs != APR_SUCCESS) {
         ap_log_error(APLOG_MARK, APLOG_ERR, rs, s, APLOGNO(02665)
             "mod_lua: Failed to create shared memory segment on file %s",
-                     lua_ivm_shmfile);
+                     lua_ivm_shmfile ? lua_ivm_shmfile : "(anonymous)");
         return HTTP_INTERNAL_SERVER_ERROR;
     }
     pool = (apr_pool_t **)apr_shm_baseaddr_get(lua_ivm_shm);