Merge initial version of selection I/O feature into develop (#1367)

1 files changed, 12 insertions, 1 deletions

diff --git a/src/H5.c b/src/H5.c
index 1585dd3..7142234 100644
--- a/src/H5.c
+++ b/src/H5.c
@@ -83,6 +83,8 @@ hbool_t H5_libinit_g = FALSE; /* Library hasn't been initialized */
 hbool_t H5_libterm_g = FALSE; /* Library isn't being shutdown */
 #endif
 
+hbool_t H5_use_selection_io_g = FALSE;
+
 #ifdef H5_HAVE_MPE
 hbool_t H5_MPEinit_g = FALSE; /* MPE Library hasn't been initialized */
 #endif
@@ -144,7 +146,8 @@ herr_t
 H5_init_library(void)
 {
     size_t i;
-    herr_t ret_value = SUCCEED;
+    char * env_use_select_io = NULL;
+    herr_t ret_value         = SUCCEED;
 
     FUNC_ENTER_NOAPI(FAIL)
 
@@ -288,6 +291,14 @@ H5_init_library(void)
     }
     /* clang-format on */
 
+    /* Check for HDF5_USE_SELECTION_IO env variable */
+    env_use_select_io = HDgetenv("HDF5_USE_SELECTION_IO");
+    if (NULL != env_use_select_io && HDstrcmp(env_use_select_io, "") && HDstrcmp(env_use_select_io, "0") &&
+        HDstrcmp(env_use_select_io, "no") && HDstrcmp(env_use_select_io, "No") &&
+        HDstrcmp(env_use_select_io, "NO") && HDstrcmp(env_use_select_io, "false") &&
+        HDstrcmp(env_use_select_io, "False") && HDstrcmp(env_use_select_io, "FALSE"))
+        H5_use_selection_io_g = TRUE;
+
     /* Debugging? */
     H5__debug_mask("-all");
     H5__debug_mask(HDgetenv("HDF5_DEBUG"));