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#include <stdio.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <assert.h>
#include <dirent.h>
#include <string.h>
struct plugin_list
{
char *name;
void *handle;
struct plugin_list *next;
};
struct plugin_list *plugins = NULL;
struct plugin_list **next = &plugins;
static void *load_plugin(const char *name)
{
for (struct plugin_list *ptr = plugins; ptr != NULL; ptr = ptr->next) {
if (strcmp(ptr->name, name) == 0)
return ptr->handle;
}
size_t len = strlen(name);
char dependency_file_name[1 + 1 + 7 + 1 + len + 1 + 12 + 1 + 3 + 1];
sprintf(dependency_file_name, "./plugins/%s/dependencies.txt", name);
FILE *dependency_file = fopen(dependency_file_name, "r");
if (dependency_file) {
char dependency[BUFSIZ];
while (fscanf(dependency_file, "%s", dependency) != EOF)
load_plugin(dependency);
fclose(dependency_file);
}
char library_name[1 + 1 + 7 + 1 + len + 1 + len + 1 + 2 + 1];
sprintf(library_name, "./plugins/%s/%s.so", name, name);
void *handle = dlopen(library_name, RTLD_NOW | RTLD_GLOBAL);
if (! handle) {
printf("%s\n", dlerror());
exit(EXIT_FAILURE);
}
char *namebuf = malloc(len + 1);
strcpy(namebuf, name);
*next = malloc(sizeof(struct plugin_list));
**next = (struct plugin_list) {
.name = namebuf,
.handle = handle,
.next = NULL,
};
next = &(*next)->next;
printf("Loaded %s\n", name);
return handle;
}
int main()
{
void *main_plugin = load_plugin("game");
DIR *dir = opendir("plugins");
assert(dir);
struct dirent *dp;
while (dp = readdir(dir))
if (dp->d_name[0] != '.')
load_plugin(dp->d_name);
closedir(dir);
void (*game_func)() = dlsym(main_plugin, "game");
assert(game_func);
game_func();
}
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