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/* eurephia_getsym.c -- Retrieves symbols from dlopened libraries
*
* GPLv2 only - Copyright (C) 2008 - 2012
* David Sommerseth <dazo@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* @file eurephia_getsym.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2008-08-10
*
* @brief Helper functions for handling dynamic loaded objects (.so files)
*
*/
#include <stdio.h>
#include <dlfcn.h>
#include <eurephia_context.h>
#include "eurephia_log.h"
/**
* Retrieves a function pointer to a given function name
*
* @param ctx eurephiaCTX
* @param dlh Handler which dlopen() returned
* @param symnam Name of the function to find
*
* @return Returns a pointer to the function if it was found, otherwise NULL is returned.
*/
void *eGetSym_optional(eurephiaCTX *ctx, void *dlh, const char *symnam)
{
if( ctx->fatal_error > 0 ) {
return NULL;
}
DEBUG(ctx, 30, "Locating driver function '%s'", symnam);
return dlsym(dlh, symnam);
}
/**
* Similar to @eGetSym_optional(), but will trigger a panic error if symnam isn't found.
*
* @param ctx eurephiaCTX
* @param dlh Handler which dlopen() returned
* @param symnam Name of the function to find
*
* @return Returns a pointer to the function if it was found, otherwise NULL is returned.
*/
void *eGetSym(eurephiaCTX *ctx, void *dlh, const char *symnam) {
void *func = NULL;
if( ctx->fatal_error > 0 ) {
return NULL;
}
func = eGetSym_optional(ctx, dlh, symnam);
if( func == NULL ) {
eurephia_log(ctx, LOG_PANIC, 0, "Could not find needed '%s' function in driver", symnam);
ctx->fatal_error = 1;
}
return func;
}
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