Add support for H5Aiterate. Add h5dsm_attr_iter.c example for this.

Added minor comments to other areas.

1 files changed, 104 insertions, 0 deletions

diff --git a/examples/h5dsm_attr_iter.c b/examples/h5dsm_attr_iter.c
new file mode 100644
index 0000000..c29926e
--- /dev/null
+++ b/examples/h5dsm_attr_iter.c
@@ -0,0 +1,104 @@
+#include "h5dsm_example.h"
+
+int od_test_g;
+
+herr_t iter_cb(hid_t loc_id, const char *attr_name, const H5A_info_t *ainfo,
+        void *op_data) {
+    /* Print attribute name and size */
+    printf("%s: %d bytes\n", attr_name, (int)ainfo->data_size);
+
+    /* Check op_data */
+    if(op_data != &od_test_g)
+        PRINTF_ERROR("op_data incorrect");
+
+    return 0;
+
+error:
+    return -1;
+}
+
+int main(int argc, char *argv[]) {
+    uuid_t pool_uuid;
+    char *pool_grp = NULL;
+    hid_t file = -1, obj = -1, fapl = -1;
+    hsize_t num_attr = 0;
+    herr_t ret;
+    H5VL_daosm_snap_id_t snap_id;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc < 5 || argc > 6)
+        PRINTF_ERROR("argc must be 5 or 6\n");
+
+    /* Parse UUID */
+    if(0 != uuid_parse(argv[1], pool_uuid))
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLdaosm_init(MPI_COMM_WORLD, pool_uuid, pool_grp) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_daosm(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open snapshot if specified */
+    if(argc == 6) {
+        snap_id = (H5VL_daosm_snap_id_t)atoi(argv[5]);
+        printf("Opening snapshot %llu\n", (long long unsigned)snap_id);
+        if(H5Pset_daosm_snap_open(fapl, snap_id) < 0)
+            ERROR;
+    } /* end if */
+
+    /* Open file */
+    if((file = H5Fopen(argv[2], H5F_ACC_RDONLY, fapl)) < 0)
+        ERROR;
+
+    /* Open object */
+    if(!strcmp(argv[3], "-d") || !strcmp(argv[3], "-D")) {
+        if((obj = H5Dopen2(file, argv[4], H5P_DEFAULT)) < 0)
+            ERROR;
+    }
+    else {
+        if(strcmp(argv[3], "-g") && strcmp(argv[3], "-G"))
+            PRINTF_ERROR("argv[3] must be -d, -D, -g, or -G\n");
+        if((obj = H5Gopen2(file, argv[4], H5P_DEFAULT)) < 0)
+            ERROR;
+    }
+
+    printf("Iterating over attributes\n");
+
+    /* Iterate */
+    if((ret = H5Aiterate(obj, H5_INDEX_NAME, H5_ITER_NATIVE, &num_attr, iter_cb, &od_test_g)) < 0)
+        ERROR;
+
+    printf("Complete.  Number of attributes: %d\n", (int)num_attr);
+
+    /* Close */
+    if(H5Oclose(obj) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Oclose(obj);
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+