test.c

test.c (text/x-csrc), 501 bytes, created by Andrew Aladjev on 2020-08-08 19:39:38 UTC

#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#ifndef O_PATH
#define O_PATH __O_PATH
#endif

int main () {
  int fd = open("/proc/self/exe", O_PATH);
  if (fd < 0) {
    return 1;
  }

  char path[512];
  sprintf(path, "/proc/self/fd/%d", fd);

  char buf[512];
  readlinkat(AT_FDCWD, path, buf, 512);
  close(fd);

  char *resolved_path = realpath("/proc/self/exe", NULL);
  fprintf(stderr, "resolved path %p\n", resolved_path);
  free(resolved_path);

  return 0;
}