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dlsym/
dlsym.c (
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#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
/*
* test this program using:
*
* ./dlsym subject incr
* ./dlsym subject decr
*/
int (*bfcn)(int); /* prototype of fcn to be called in lib */
int main(int argc, char *argv[]) {
dlerror(); /* clear */
if (argc < 2) {
fprintf(stderr,"usage: %s <solib> [<symbol>]\n", argv[0]);
exit(-1);
}
char *lib = argv[1];
char *sym = (argc > 2) ? argv[2] : "incr";
void *handle = dlopen(lib, RTLD_LAZY);
if (!handle) {
fprintf(stderr, "dlopen failed: %s\n", dlerror());
exit(-1);
}
void *addr = dlsym(handle,sym);
bfcn=addr;
int rc=(*bfcn)(1);
printf("rc is %d\n",rc);
dlclose(handle);
}
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