wrapper/fdtable.c

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  * wrapper/fdtable.c
   3  *
   4  * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #include <linux/version.h>
   8 #include <linux/spinlock.h>
   9 #include <wrapper/fdtable.h>
  10
  11 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0))
  12
  13 /*
  14  * Reimplementation of iterate_fd() for kernels between 2.6.32 and 3.6
  15  * (inclusive).
  16  */
  17 int lttng_iterate_fd(struct files_struct *files,
  18                 unsigned int first,
  19                 int (*cb)(const void *, struct file *, unsigned int),
  20                 const void *ctx)
  21 {
  22         struct fdtable *fdt;
  23         struct file *filp;
  24         unsigned int i;
  25         int res = 0;
  26
  27         if (!files)
  28                 return 0;
  29         spin_lock(&files->file_lock);
  30         fdt = files_fdtable(files);
  31         for (i = 0; i < fdt->max_fds; i++) {
  32                 filp = fcheck_files(files, i);
  33                 if (!filp)
  34                         continue;
  35                 res = cb(ctx, filp, i);
  36                 if (res)
  37                         break;
  38         }
  39         spin_unlock(&files->file_lock);
  40         return res;
  41 }
  42
  43 #endif