src/engine.c

   1 /*
   2  *  UI Gadget
   3  *
   4  * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
   5  *
   6  * Contact: Jayoun Lee <airjany@samsung.com>
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  * http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  *
  20  */
  21
  22 #include <linux/limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <dlfcn.h>
  28 #include <unistd.h>
  29 #include <sys/types.h>
  30
  31 #include "ug-engine.h"
  32 #include "ug-dbg.h"
  33
  34 #define UG_ENGINE_INIT_SYM "UG_ENGINE_INIT"
  35 #define UG_ENGINE_EXIT_SYM "UG_ENGINE_EXIT"
  36
  37 enum ug_engine_type {
  38         UG_ENGINE_EFL = 0x00,
  39 };
  40
  41 static int file_exist(const char *filename)
  42 {
  43         FILE *file;
  44
  45         file = fopen(filename, "r");
  46         if (file)
  47         {
  48                 fclose(file);
  49                 return 0;
  50         }
  51         return -1;
  52 }
  53
  54 struct ug_engine *ug_engine_load()
  55 {
  56         void *handle;
  57         struct ug_engine *engine;
  58         char engine_file[PATH_MAX];
  59         enum ug_engine_type type = UG_ENGINE_EFL;
  60         int (*engine_init)(struct ug_engine_ops *ops);
  61
  62         engine = calloc(1, sizeof(struct ug_engine));
  63
  64         if (!engine) {
  65                 errno = ENOMEM;
  66                 return NULL;
  67         }
  68
  69         if (type == UG_ENGINE_EFL) { /* UG_ENGINE_EFL is default*/
  70                 if (snprintf(engine_file, PATH_MAX, "/usr/lib/libui-gadget-1-efl-engine.so") < 0){
  71                         goto engine_free;
  72                 }
  73                 else if (file_exist(engine_file) < 0) {
  74                         goto engine_free;
  75                 }
  76         }
  77         else
  78                 goto engine_free;
  79
  80         handle = dlopen(engine_file, RTLD_LAZY);
  81         if (!handle) {
  82                 _ERR("dlopen failed: %s\n", dlerror());
  83                 goto engine_free;
  84         }
  85
  86         engine_init = dlsym(handle, UG_ENGINE_INIT_SYM);
  87         if (!engine_init) {
  88                 _ERR("dlsym failed: %s\n", dlerror());
  89                 goto engine_dlclose;
  90         }
  91
  92         if (engine_init(&engine->ops))
  93                 goto engine_dlclose;
  94
  95         engine->handle = handle;
  96         return engine;
  97
  98 engine_dlclose:
  99         dlclose(handle);
 100
 101 engine_free:
 102         free(engine);
 103         return NULL;
 104 }
 105
 106 int ug_engine_unload(struct ug_engine *engine)
 107 {
 108         void (*engine_exit)(struct ug_engine_ops *ops);
 109
 110         if (!engine) {
 111                 errno = EINVAL;
 112                 return -1;
 113         }
 114
 115         if (engine->handle) {
 116                 engine_exit = dlsym(engine->handle, UG_ENGINE_EXIT_SYM);
 117                 if (engine_exit)
 118                         engine_exit(&engine->ops);
 119                 else
 120                         _ERR("dlsym failed: %s\n", dlerror());
 121
 122                 dlclose(engine->handle);
 123         }
 124
 125         free(engine);
 126         return 0;
 127 }