1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/pkg/devices/util/src/dl.cc Mon May 28 23:44:25 2018 +0200
1.3 @@ -0,0 +1,50 @@
1.4 +/*
1.5 + * Dynamic loading support.
1.6 + *
1.7 + * (c) 2018 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include <l4/devices/dl.h>
1.26 +#include <dlfcn.h>
1.27 +#include <stdio.h>
1.28 +
1.29 +void *load_function(const char *filename, const char *function)
1.30 +{
1.31 + char libname[64];
1.32 + FILE *f = fopen(filename, "r");
1.33 + size_t nread;
1.34 + void *handle;
1.35 +
1.36 + /* Obtain the library name from the file. */
1.37 +
1.38 + if (f == NULL) return 0;
1.39 +
1.40 + nread = fread(libname, sizeof(char), 63, f);
1.41 + fclose(f);
1.42 +
1.43 + if (ferror(f)) return 0;
1.44 +
1.45 + libname[nread] = '\0';
1.46 +
1.47 + /* Obtain the linked data. */
1.48 +
1.49 + handle = dlopen(libname, RTLD_NOW);
1.50 + if (handle == NULL) return 0;
1.51 +
1.52 + return dlsym(handle, function);
1.53 +}