mergerfs/src/ugid_rwlock.ipp

/*
  Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>

#include <vector>

namespace mergerfs
{
  namespace ugid
  {
    uid_t currentuid;
    gid_t currentgid;
    pthread_rwlock_t rwlock;

    void
    init()
    {
      pthread_rwlockattr_t attr;

      pthread_rwlockattr_init(&attr);
# if defined PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
      pthread_rwlockattr_setkind_np(&attr,PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP);
# endif

      pthread_rwlock_init(&rwlock,&attr);

      currentuid = ::geteuid();
      currentgid = ::getegid();
    }
  }
}