wrapper/fdtable.c

   1 /*
   2  * wrapper/fdtable.c
   3  *
   4  * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; only
   9  * version 2.1 of the License.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <linux/version.h>
  22 #include <linux/spinlock.h>
  23 #include <wrapper/fdtable.h>
  24
  25 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))
  26
  27 /*
  28  * Reimplementation of iterate_fd() for kernels between 2.6.32 and 3.6
  29  * (inclusive).
  30  */
  31 int lttng_iterate_fd(struct files_struct *files,
  32                 unsigned int first,
  33                 int (*cb)(const void *, struct file *, unsigned int),
  34                 const void *ctx)
  35 {
  36         struct fdtable *fdt;
  37         struct file *filp;
  38         unsigned int i;
  39         int res = 0;
  40
  41         if (!files)
  42                 return 0;
  43         spin_lock(&files->file_lock);
  44         fdt = files_fdtable(files);
  45         for (i = 0; i < fdt->max_fds; i++) {
  46                 filp = fcheck_files(files, i);
  47                 if (!filp)
  48                         continue;
  49                 res = cb(ctx, filp, i);
  50                 if (res)
  51                         break;
  52         }
  53         spin_unlock(&files->file_lock);
  54         return res;
  55 }
  56
  57 #endif