LXR qemu/util/selfmap.c

   1/*
   2 * Utility function to get QEMU's own process map
   3 *
   4 * Copyright (c) 2020 Linaro Ltd
   5 *
   6 * SPDX-License-Identifier: GPL-2.0-or-later
   7 */
   8
   9#include "qemu/osdep.h"
  10#include "qemu/cutils.h"
  11#include "qemu/selfmap.h"
  12
  13GSList *read_self_maps(void)
  14{
  15    gchar *maps;
  16    GSList *map_info = NULL;
  17
  18    if (g_file_get_contents("/proc/self/maps", &maps, NULL, NULL)) {
  19        gchar **lines = g_strsplit(maps, "\n", 0);
  20        int i, entries = g_strv_length(lines);
  21
  22        for (i = 0; i < entries; i++) {
  23            gchar **fields = g_strsplit(lines[i], " ", 6);
  24            if (g_strv_length(fields) > 4) {
  25                MapInfo *e = g_new0(MapInfo, 1);
  26                int errors;
  27                const char *end;
  28
  29                errors  = qemu_strtoul(fields[0], &end, 16, &e->start);
  30                errors += qemu_strtoul(end + 1, NULL, 16, &e->end);
  31
  32                e->is_read  = fields[1][0] == 'r';
  33                e->is_write = fields[1][1] == 'w';
  34                e->is_exec  = fields[1][2] == 'x';
  35                e->is_priv  = fields[1][3] == 'p';
  36
  37                errors += qemu_strtoul(fields[2], NULL, 16, &e->offset);
  38                e->dev = g_strdup(fields[3]);
  39                errors += qemu_strtou64(fields[4], NULL, 10, &e->inode);
  40
  41                /*
  42                 * The last field may have leading spaces which we
  43                 * need to strip.
  44                 */
  45                if (g_strv_length(fields) == 6) {
  46                    e->path = g_strdup(g_strchug(fields[5]));
  47                }
  48                map_info = g_slist_prepend(map_info, e);
  49            }
  50
  51            g_strfreev(fields);
  52        }
  53        g_strfreev(lines);
  54        g_free(maps);
  55    }
  56
  57    /* ensure the map data is in the same order we collected it */
  58    return g_slist_reverse(map_info);
  59}
  60
  61/**
  62 * free_self_maps:
  63 * @info: a GSlist
  64 *
  65 * Free a list of MapInfo structures.
  66 */
  67static void free_info(gpointer data)
  68{
  69    MapInfo *e = (MapInfo *) data;
  70    g_free(e->dev);
  71    g_free(e->path);
  72    g_free(e);
  73}
  74
  75void free_self_maps(GSList *info)
  76{
  77    g_slist_free_full(info, &free_info);
  78}
  79