#define _GNU_SOURCE
#include <dlfcn.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
/* Compatibility only: the container exposes our executable via /proc/self/exe. */
ssize_t readlink(const char *path, char *buf, size_t n) {
  static ssize_t (*real_readlink)(const char *, char *, size_t);
  if (!real_readlink) real_readlink = dlsym(RTLD_NEXT, "readlink");
  char own[80]; snprintf(own, sizeof own, "/proc/%d/exe", (int)getpid());
  return real_readlink(strcmp(path, own) == 0 ? "/proc/self/exe" : path, buf, n);
}