Major - P3 I am observing strange behaviour in mongoc_gridfs_file_get_upload_date() in my 32-bit chroot system. On a 64-bit system, it seems to return credible results. On a 32-bit system, the returned results barely resemble "milliseconds since the UNIX epoch", if at all.
The code:
#include <mongoc.h> int main() { mongoc_client_t *client; mongoc_gridfs_t *gridfs; mongoc_gridfs_file_t *file; bson_error_t error; int64_t t; mongoc_init(); client = mongoc_client_new("mongodb://127.0.0.1"); BSON_ASSERT(client); gridfs = mongoc_client_get_gridfs(client, "test-gridfs", 0, &error); BSON_ASSERT(gridfs); file = mongoc_gridfs_create_file(gridfs, 0); BSON_ASSERT(file); t = mongoc_gridfs_file_get_upload_date(file); printf("upload_date: %lld\n", t); // This fails on "bad days" :-) BSON_ASSERT(t > 0); mongoc_gridfs_file_destroy(file); mongoc_gridfs_destroy(gridfs); mongoc_client_destroy(client); mongoc_cleanup(); return 0; }
The output on a 64-bit system:
$ ./a.out upload_date: 1486175015000 $ ./a.out upload_date: 1486175016000 $ ./a.out upload_date: 1486175017000 $ ./a.out upload_date: 1486175018000
Seems legit - ascending 64-bit millisecond timestamp value every time the program is run.
The output on a 32-bit system:
$ ./a.out upload_date: 116451584 $ ./a.out upload_date: 116452584 $ ./a.out upload_date: 116454584 $ ./a.out upload_date: 116457584 $ ./a.out upload_date: 116458584 $ ./a.out upload_date: 116460584 $ ./a.out upload_date: 116461584
Doesn't look like an ascending 64-bit millisecond timestamp at all. On "bad days", values can even be negative as some arbitrary internal bit distortion takes place.