ceph/src/common/fd.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2012 Inktank
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include "include/compat.h"
  16 #include "fd.h"
  17
  18 #include <sys/types.h>
  19 #include <unistd.h>
  20 #include <dirent.h>
  21 #include <errno.h>
  22
  23 #include "debug.h"
  24 #include "errno.h"
  25
  26 void dump_open_fds(CephContext *cct)
  27 {
  28   const char *fn = PROCPREFIX "/proc/self/fd";
  29   DIR *d = opendir(fn);
  30   if (!d) {
  31     lderr(cct) << "dump_open_fds unable to open " << fn << dendl;
  32     return;
  33   }
  34   struct dirent *de = nullptr;
  35
  36   int n = 0;
  37   while ((de = ::readdir(d))) {
  38     if (de->d_name[0] == '.')
  39       continue;
  40     char path[PATH_MAX];
  41     snprintf(path, sizeof(path), "%s/%s", fn, de->d_name);
  42     char target[PATH_MAX];
  43     ssize_t r = readlink(path, target, sizeof(target) - 1);
  44     if (r < 0) {
  45       r = -errno;
  46       lderr(cct) << "dump_open_fds unable to readlink " << path << ": " << cpp_strerror(r) << dendl;
  47       continue;
  48     }
  49     target[r] = 0;
  50     lderr(cct) << "dump_open_fds " << de->d_name << " -> " << target << dendl;
  51     n++;
  52   }
  53   lderr(cct) << "dump_open_fds dumped " << n << " open files" << dendl;
  54
  55   closedir(d);
  56 }