compile

# To compile from the root of the c driver
scons
gcc -static -std=c99 -Wall query.c -I./src -L. -lbson -lmongoc -o query

query.c

/* query.c */

#include "bson.h"
#include "mongo.h"

int main() {
  bson b;
  bson_buffer bb;

  bson_buffer_init( &bb );

    {
      bson_buffer * query = bson_append_start_object( &bb, "$query");
        bson_buffer * spec = bson_append_start_object( &bb, "foo");
          bson_append_int( spec, "$gt", 1);
        bson_append_finish_object( spec );
      bson_append_finish_object( query );
    }

    {
      bson_buffer * sort = bson_append_start_object( &bb, "$sort");
        bson_append_int( sort, "foo", -1);
      bson_append_finish_object( sort );
    }

  bson_append_finish_object( &bb );

  bson_from_buffer( &b , &bb );
  bson_print( &b );

  const char * ns = "test.things";
  mongo_connection conn[1];

  mongo_connect( conn , NULL );

  mongo_cursor * cursor;
  cursor = mongo_find( conn , ns , &b , 0 , 0 , 0 , 0 );

  while (mongo_cursor_next(cursor)){
    bson_iterator it;
    bson_iterator_init(&it, cursor->current.data);
    bson_print(&(cursor->current));
  }

}