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acl_get_fd.c

/*
  File: acl_get_fd.c

  Copyright (C) 1999, 2000
  Andreas Gruenbacher, <a.gruenbacher@computer.org>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <attr/xattr.h>
#include <acl/libacl.h>
#include "libacl.h"
#include "__acl_from_xattr.h"

#include "byteorder.h"
#include "acl_ea.h"


/* 23.4.15 */
acl_t
acl_get_fd(int fd)
{
      const size_t size_guess = acl_ea_size(16);
      char *ext_acl_p = alloca(size_guess);
      int retval;

      if (!ext_acl_p)
            return NULL;
      retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p, size_guess);
      if (retval == -1 && errno == ERANGE) {
            retval = fgetxattr(fd, ACL_EA_ACCESS, NULL, 0);
            if (retval > 0) {
                  ext_acl_p = alloca(retval);
                  if (!ext_acl_p)
                        return NULL;
                  retval = fgetxattr(fd, ACL_EA_ACCESS, ext_acl_p,retval);
            }
      }
      if (retval > 0) {
            acl_t acl = __acl_from_xattr(ext_acl_p, retval);
            return acl;
      } else if (retval == 0 || errno == ENOATTR || errno == ENODATA) {
            struct stat st;

            if (fstat(fd, &st) == 0)
                  return acl_from_mode(st.st_mode);
            else
                  return NULL;
      } else
            return NULL;
}


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