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/*
* Query soname of shared library.
* Copyright © 2015 Peter Colberg.
* Distributed under the MIT license.
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#define error(fmt, ...) fprintf(stderr, "%s: "fmt"\n", argv[0], ##__VA_ARGS__)
/*
* For a given symbol name, this program prints the path relative to /
* of the shared library containing that symbol. The program must be
* linked against the shared libraries to be queried for symbols, and
* compiled as a position-independent executable using -fPIE.
*/
int main(int argc, const char *const *argv)
{
Dl_info info;
void *sym;
if (argc != 2) {
fprintf(stderr, "Usage: %s SYMBOL\n", argv[0]);
return 1;
}
if (!(sym = dlsym(RTLD_DEFAULT, argv[1]))) {
fprintf(stderr, "%s\n", dlerror());
return 1;
}
if (dladdr(sym, &info) == 0) {
fprintf(stderr, "%s\n", dlerror());
return 1;
}
if (info.dli_saddr != sym) {
error("mismatching symbol name: %s", info.dli_sname);
return 1;
}
if (info.dli_fname[0] != '/') {
error("library name not an absolute path: %s", info.dli_fname);
return 1;
}
printf("%s", info.dli_fname + 1);
return 0;
}
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