in case HDF5_VOL_CONNECTOR is set without value

Author: wkliao

src/e3sm_io.c

@@ -39,8 +39,8 @@ void check_connector_env(e3sm_io_config *cfg) {
         cfg->env_log_passthru = 1;
 
     env_str = getenv("HDF5_VOL_CONNECTOR");
-    if (env_str == NULL)
-        /* env HDF5_VOL_CONNECTOR is not set */
+    if (env_str == NULL || env_str[0] == '\0')
+        /* env HDF5_VOL_CONNECTOR is not set or set with ni value */
         return;
 
     if (strstr(env_str, "under_vol=512") != NULL || strstr(env_str, "async ") != NULL)
@@ -50,6 +50,8 @@ void check_connector_env(e3sm_io_config *cfg) {
 
     env_str = strdup(env_str);
     char *connector = strtok(env_str, "  \t\n\r");
+    if (connector == NULL) return;
+
     if (strcmp(connector, "LOG") == 0) {
         /* if LOG is set in HDF5_VOL_CONNECTOR */
         cfg->env_log = 1;

test.sh

@@ -137,6 +137,7 @@ for API in "${APIS[@]}" ; do
         CMD="${RUN} ${EXEC} -k -a ${ap[0]} -r 2 -x ${ap[1]} -y 2 -o ${OUT_FILE} ${IN_FILE}"
         echo "CMD = ${CMD}"
         ${CMD}
+
         # run read operations (currently support pnetcdf, netcdf4 and canonical only)
         # Disable read for netcdf4 as it is extremely slow.
         if test "x${ap[1]}" = xcanonical && test "x${ap[0]}" == xpnetcdf ; then