1 /* 2 * Dynamic loading support. 3 * 4 * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #include <l4/devices/dl.h> 23 #include <dlfcn.h> 24 #include <stdio.h> 25 26 void *load_function(const char *filename, const char *function) 27 { 28 char libname[64]; 29 FILE *f = fopen(filename, "r"); 30 size_t nread; 31 void *handle; 32 33 /* Obtain the library name from the file. */ 34 35 if (f == NULL) return 0; 36 37 nread = fread(libname, sizeof(char), 63, f); 38 fclose(f); 39 40 if (ferror(f)) return 0; 41 42 libname[nread] = '\0'; 43 44 /* Obtain the linked data. */ 45 46 handle = dlopen(libname, RTLD_NOW); 47 if (handle == NULL) return 0; 48 49 return dlsym(handle, function); 50 }