sysdeps/unix/sysv/linux/procutils.h

   1 /* Utilities functions to read/parse Linux procfs and sysfs.
   2    Copyright (C) 2023 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 _PROCUTILS_H
  20 #define _PROCUTILS_H
  21
  22 #include <stdbool.h>
  23
  24 typedef int (*procutils_closure_t) (const char *line, void *arg);
  25
  26 #define PROCUTILS_MAX_LINE_LEN 256
  27
  28 /* Open and read the path FILENAME, line per line, and call CLOSURE with
  29    argument ARG on each line.  The read is done with a static buffer,
  30    with non-cancellable calls, and the line is null terminated.
  31
  32    The CLOSURE should return 0 if the read should continue, otherwise the
  33    the function should stop and return early.
  34
  35    The '\n' is not included in the CLOSURE input argument and lines longer
  36    than PROCUTILS_MAX_LINE_LEN characteres are ignored.
  37
  38    It returns true in case the file is fully read or false if CLOSURE
  39    returns a value diferent than 0.  */
  40 bool procutils_read_file (const char *filename, procutils_closure_t closure,
  41                           void *arg) attribute_hidden;
  42
  43 #endif