support/descriptors.h

   1 /* Monitoring file descriptor usage.
   2    Copyright (C) 2018-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef SUPPORT_DESCRIPTORS_H
  20 #define SUPPORT_DESCRIPTORS_H
  21
  22 #include <stdio.h>
  23
  24 /* Opaque pointer, for capturing file descriptor lists.  */
  25 struct support_descriptors;
  26
  27 /* Record the currently open file descriptors and store them in the
  28    returned list.  Terminate the process if the listing operation
  29    fails.  */
  30 struct support_descriptors *support_descriptors_list (void);
  31
  32 /* Deallocate the list of descriptors.  */
  33 void support_descriptors_free (struct support_descriptors *);
  34
  35 /* Write the list of descriptors to STREAM, adding PREFIX to each
  36    line.  */
  37 void support_descriptors_dump (struct support_descriptors *,
  38                                const char *prefix, FILE *stream);
  39
  40 /* Check for file descriptor leaks and other file descriptor changes:
  41    Compare the current list of descriptors with the passed list.
  42    Record a test failure if there are additional open descriptors,
  43    descriptors have been closed, or if a change in file descriptor can
  44    be detected.  */
  45 void support_descriptors_check (struct support_descriptors *);
  46
  47 #endif /* SUPPORT_DESCRIPTORS_H */