File Descriptor Counts on Linux

gistfile1.c

#ifndef NDEBUG
#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/resource.h>
int _debug_get_num_fds() {
     int fd_count = 0;
     struct dirent *dp = NULL;
     DIR *dir = opendir("/proc/self/fd");
     while ((dp = readdir(dir)) != NULL) {
          ++fd_count;
     }
     closedir(dir);
     return fd_count;
}
#endif