smatch_mem_tracker.c

   1 /*
   2  * Copyright (C) 2018 Oracle.
   3  * Copyright 2019 Joyent, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  17  */
  18
  19 #include "smatch.h"
  20 #include <fcntl.h>
  21 #include <unistd.h>
  22 #ifdef __sun
  23 #include <sys/procfs.h>
  24 #endif
  25
  26 static int my_id;
  27
  28 static unsigned long max_size;
  29
  30 #ifdef __sun
  31 unsigned long get_mem_kb(void)
  32 {
  33         static int my_fd = -2;
  34         prpsinfo_t pbuf;
  35
  36         if (my_fd == -2) {
  37                 /* Do not repeatedly attempt this if it fails. */
  38                 my_fd = open("/proc/self/psinfo", O_RDONLY);
  39         }
  40         if (my_fd == -1) {
  41                 return (0);
  42         }
  43
  44         if (pread(my_fd, &pbuf, sizeof (pbuf), 0) != sizeof (pbuf)) {
  45                 return (0);
  46         }
  47
  48         return (pbuf.pr_rssize);
  49 }
  50 #else
  51 unsigned long get_mem_kb(void)
  52 {
  53         FILE *file;
  54         char buf[1024] = "0";
  55         unsigned long size;
  56
  57         file = fopen("/proc/self/statm", "r");
  58         if (!file)
  59                 return 0;
  60         fread(buf, 1, sizeof(buf), file);
  61         fclose(file);
  62
  63         size = strtoul(buf, NULL, 10);
  64         size = size * sysconf(_SC_PAGESIZE) / 1024;
  65         return size;
  66 }
  67 #endif
  68
  69 static void match_end_func(struct symbol *sym)
  70 {
  71         unsigned long size;
  72
  73         if (option_mem) {
  74                 size = get_mem_kb();
  75                 if (size > max_size)
  76                         max_size = size;
  77         }
  78 }
  79
  80 unsigned long get_max_memory(void)
  81 {
  82         return max_size;
  83 }
  84
  85 void register_mem_tracker(int id)
  86 {
  87         my_id = id;
  88
  89         add_hook(&match_end_func, END_FUNC_HOOK);
  90 }