1 /*
   2  * Copyright (C) 2018 Oracle.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17 
  18 #include "smatch.h"
  19 #include <fcntl.h>
  20 #include <unistd.h>
  21 #include <sys/procfs.h>
  22 
  23 static int my_id;
  24 static int my_fd = -2;
  25 
  26 static unsigned long max_size;
  27 
  28 unsigned long get_mem_kb(void)
  29 {
  30         prpsinfo_t pbuf;
  31 
  32         if (my_fd == -2) {
  33                 /* Do not repeatedly attempt this if it fails. */
  34                 my_fd = open("/proc/self/psinfo", O_RDONLY);
  35         }
  36         if (my_fd == -1) {
  37                 return (0);
  38         }
  39 
  40         if (pread(my_fd, &pbuf, sizeof (pbuf), 0) != sizeof (pbuf)) {
  41                 return (0);
  42         }
  43 
  44         return (pbuf.pr_rssize);
  45 }
  46 
  47 static void match_end_func(struct symbol *sym)
  48 {
  49         unsigned long size;
  50 
  51         if (option_mem) {
  52                 size = get_mem_kb();
  53                 if (size > max_size)
  54                         max_size = size;
  55         }
  56 }
  57 
  58 unsigned long get_max_memory(void)
  59 {
  60         return max_size;
  61 }
  62 
  63 void register_mem_tracker(int id)
  64 {
  65         my_id = id;
  66 
  67         add_hook(&match_end_func, END_FUNC_HOOK);
  68 }