BUILD
-------------------------------------------------------------------------------
clang main.c -pthread -isystem /usr/local/dy/mongodb/include/libmongoc-1.0 -isystem /usr/local/dy/mongodb/include/libbson-1.0 \
    /usr/local/dy/mongodb/lib/libmongoc-1.0.a /usr/local/dy/mongodb/lib/libbson-1.0.a -ldl -lrt


RUN OUTPUT
-------------------------------------------------------------------------------
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault
jwang:~/temp/build_debug$ bin/mongo_c_test 
No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on 'localhost:27017']
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault
jwang:~/temp/build_debug$ bin/mongo_c_test 
No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on 'localhost:27017']
jwang:~/temp/build_debug$ bin/mongo_c_test 
Segmentation fault


SOURCE
-------------------------------------------------------------------------------

int main(int argc, char *argv[])
{
    (void)argc;
    (void)argv;
    mongoc_client_t *client;
    mongoc_database_t *database;
    mongoc_collection_t *collection;
    bson_t *command, reply, *insert;
    bson_error_t error;
    char *str;
    bool retval;

    /*
     * Required to initialize libmongoc's internals
     */
    mongoc_init();

    /*
     * Create a new client instance
     */
    client = mongoc_client_new("mongodb://localhost:27017");

    /*
     * Get a handle on the database "db_name" and collection "coll_name"
     */
    database = mongoc_client_get_database(client, "db_name");
    collection = mongoc_client_get_collection(client, "db_name", "coll_name");

    /*
     * Do work. This example pings the database, prints the result as JSON and
     * performs an insert
     */
    command = BCON_NEW("ping", BCON_INT32(1));

    retval = mongoc_client_command_simple(client, "admin", command, NULL, &reply, &error);

    if (!retval) {
        fprintf(stderr, "%s\n", error.message);
        return EXIT_FAILURE;
    }

    str = bson_as_json(&reply, NULL);
    fprintf(stdout, "%s\n", str);

    insert = BCON_NEW("hello", BCON_UTF8("world"));

    if (!mongoc_collection_insert(collection, MONGOC_INSERT_NONE, insert, NULL, &error)) {
        fprintf(stderr, "%s\n", error.message);
    }

    bson_destroy(insert);
    bson_destroy(&reply);
    bson_destroy(command);
    bson_free(str);

    /*
     * Release our handles and clean up libmongoc
     */
    mongoc_collection_destroy(collection);
    mongoc_database_destroy(database);
    mongoc_client_destroy(client);
    mongoc_cleanup();

    return 0;
}


LLDB
-------------------------------------------------------------------------------

(lldb) r
Process 1769739 launched: '/u/jwang/temp/build_debug/bin/mongo_c_test' (x86_64)
Process 1769739 stopped
* thread #1: tid = 1769739, 0x000000000044335b mongo_c_test`_mongoc_client_new_from_uri + 235, name = 'mongo_c_test', stop reason = signal SIGSEGV: invalid address (fault address: 0x7ffff80358e0)
    frame #0: 0x000000000044335b mongo_c_test`_mongoc_client_new_from_uri + 235
mongo_c_test`_mongoc_client_new_from_uri:
->  0x44335b <+235>: lock   
    0x44335c <+236>: incq   0x20(%rcx,%rax)
    0x443361 <+241>: movq   %rbx, %rax
    0x443364 <+244>: addq   $0x10, %rsp
(lldb) bt
* thread #1: tid = 1769739, 0x000000000044335b mongo_c_test`_mongoc_client_new_from_uri + 235, name = 'mongo_c_test', stop reason = signal SIGSEGV: invalid address (fault address: 0x7ffff80358e0)
  * frame #0: 0x000000000044335b mongo_c_test`_mongoc_client_new_from_uri + 235
    frame #1: 0x0000000000443247 mongo_c_test`mongoc_client_new + 55
    frame #2: 0x000000000044252a mongo_c_test`main(argc=1, argv=0x00007fffffffe0b8) + 58 at main.cpp:32
    frame #3: 0x00007ffff6a13b15 libc.so.6`__libc_start_main + 245
    frame #4: 0x0000000000442429 mongo_c_test`_start + 41
(lldb) f 0
frame #0: 0x000000000044335b mongo_c_test`_mongoc_client_new_from_uri + 235
mongo_c_test`_mongoc_client_new_from_uri:
->  0x44335b <+235>: lock   
    0x44335c <+236>: incq   0x20(%rcx,%rax)
    0x443361 <+241>: movq   %rbx, %rax
    0x443364 <+244>: addq   $0x10, %rsp
(lldb) f 1
frame #1: 0x0000000000443247 mongo_c_test`mongoc_client_new + 55
mongo_c_test`mongoc_client_new:
    0x443247 <+55>: movq   %rax, %r14
    0x44324a <+58>: movq   %rbx, %rdi
    0x44324d <+61>: callq  0x45dbf0                  ; mongoc_uri_destroy
    0x443252 <+66>: movq   %r14, %rax
(lldb) f 2
frame #2: 0x000000000044252a mongo_c_test`main(argc=1, argv=0x00007fffffffe0b8) + 58 at main.cpp:32
   29       /*
   30        * Create a new client instance
   31        */
-> 32       client = mongoc_client_new("mongodb://localhost:27017");
   33  
   34       /*
   35        * Get a handle on the database "db_name" and collection "coll_name"