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/*
* exec.c
*
* Created on: Aug 14, 2008
* Author: Stefan Bucur <stefanb@zytor.com>
*/
#include <sys/module.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "exec.h"
#define DBG_PRINT(fmt, args...) fprintf(stderr, "[EXEC] " fmt, ##args)
static struct elf_module *mod_root = NULL;
static char *module_get_fullname(const char *name) {
static char name_buff[MODULE_NAME_SIZE];
strcpy(name_buff, EXEC_DIRECTORY);
strcat(name_buff, name);
return name_buff;
}
int exec_init() {
int res;
res = modules_init();
if (res != 0)
return res;
// Load the root module
mod_root = module_alloc(module_get_fullname(EXEC_ROOT_NAME));
if (mod_root == NULL)
return -1;
res = module_load_shallow(mod_root);
if (res != 0) {
mod_root = NULL;
return res;
}
return 0;
}
int load_library(const char *name) {
int res;
struct elf_module *module = module_alloc(module_get_fullname(name));
if (module == NULL)
return -1;
res = module_load(module);
if (res != 0) {
return res;
}
if (*(module->init_func) != NULL) {
res = (*(module->init_func))();
DBG_PRINT("Initialization function returned: %d\n", res);
} else {
DBG_PRINT("No initialization function present.\n");
}
if (res != 0) {
module_unload(module);
return res;
}
return 0;
}
int unload_library(const char *name) {
int res;
struct elf_module *module = module_find(module_get_fullname(name));
if (module == NULL)
return -1;
if (*(module->exit_func) != NULL) {
(*(module->exit_func))();
}
res = module_unload(module);
return res;
}
int spawnv(const char *name, const char **argv) {
int res, ret_val;
struct elf_module *module = module_alloc(module_get_fullname(name));
if (module == NULL)
return -1;
res = module_load(module);
if (res != 0) {
return res;
}
if (*(module->main_func) != NULL) {
const char **last_arg = argv;
while (*last_arg != NULL)
last_arg++;
ret_val = (*(module->main_func))(last_arg - argv, argv);
} else {
// We can't execute without a main function
module_unload(module);
return -1;
}
res = module_unload(module);
if (res != 0) {
return res;
}
return ((unsigned int)ret_val & 0xFF);
}
int spawnl(const char *name, const char *arg, ...) {
/*
* NOTE: We assume the standard ABI specification for the i386
* architecture. This code may not work if used in other
* circumstances, including non-variadic functions, different
* architectures and calling conventions.
*/
return spawnv(name, &arg);
}
void exec_term() {
modules_term();
}
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