1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <errno.h> 18 #include <fcntl.h> 19 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <unistd.h> 23 24 #include <pagemap/pagemap.h> 25 26 #include "pm_map.h" 27 28 static int read_maps(pm_process_t *proc); 29 30 #define MAX_FILENAME 64 31 32 int pm_process_create(pm_kernel_t *ker, pid_t pid, pm_process_t **proc_out) { 33 pm_process_t *proc; 34 char filename[MAX_FILENAME]; 35 int error; 36 37 if (!ker || !proc_out) 38 return -1; 39 40 proc = calloc(1, sizeof(*proc)); 41 if (!proc) 42 return errno; 43 44 proc->ker = ker; 45 proc->pid = pid; 46 47 error = snprintf(filename, MAX_FILENAME, "/proc/%d/pagemap", pid); 48 if (error < 0 || error >= MAX_FILENAME) { 49 error = (error < 0) ? (errno) : (-1); 50 free(proc); 51 return error; 52 } 53 54 proc->pagemap_fd = open(filename, O_RDONLY); 55 if (proc->pagemap_fd < 0) { 56 error = errno; 57 free(proc); 58 return error; 59 } 60 61 error = read_maps(proc); 62 if (error) { 63 free(proc); 64 return error; 65 } 66 67 *proc_out = proc; 68 69 return 0; 70 } 71 72 int pm_process_usage(pm_process_t *proc, pm_memusage_t *usage_out) { 73 pm_memusage_t usage, map_usage; 74 int error; 75 int i; 76 77 if (!proc || !usage_out) 78 return -1; 79 80 pm_memusage_zero(&usage); 81 82 for (i = 0; i < proc->num_maps; i++) { 83 error = pm_map_usage(proc->maps[i], &map_usage); 84 if (error) return error; 85 86 pm_memusage_add(&usage, &map_usage); 87 } 88 89 memcpy(usage_out, &usage, sizeof(pm_memusage_t)); 90 91 return 0; 92 } 93 94 int pm_process_pagemap_range(pm_process_t *proc, 95 unsigned long low, unsigned long high, 96 uint64_t **range_out, size_t *len) { 97 int firstpage, numpages; 98 uint64_t *range; 99 off_t off; 100 int error; 101 102 if (!proc || (low >= high) || !range_out || !len) 103 return -1; 104 105 firstpage = low / proc->ker->pagesize; 106 numpages = (high - low) / proc->ker->pagesize; 107 108 range = malloc(numpages * sizeof(uint64_t)); 109 if (!range) 110 return errno; 111 112 off = lseek(proc->pagemap_fd, firstpage * sizeof(uint64_t), SEEK_SET); 113 if (off == (off_t)-1) { 114 error = errno; 115 free(range); 116 return error; 117 } 118 error = read(proc->pagemap_fd, (char*)range, numpages * sizeof(uint64_t)); 119 if (error < numpages * sizeof(uint64_t)) { 120 error = (error < 0) ? errno : -1; 121 free(range); 122 return error; 123 } 124 125 *range_out = range; 126 *len = numpages; 127 128 return 0; 129 } 130 131 int pm_process_maps(pm_process_t *proc, pm_map_t ***maps_out, size_t *len) { 132 pm_map_t **maps; 133 134 if (!proc || !maps_out || !len) 135 return -1; 136 137 if (proc->num_maps) { 138 maps = malloc(proc->num_maps * sizeof(pm_map_t*)); 139 if (!maps) 140 return errno; 141 142 memcpy(maps, proc->maps, proc->num_maps * sizeof(pm_map_t*)); 143 144 *maps_out = maps; 145 } else { 146 *maps_out = NULL; 147 } 148 *len = proc->num_maps; 149 150 return 0; 151 } 152 153 int pm_process_workingset(pm_process_t *proc, 154 pm_memusage_t *ws_out, int reset) { 155 pm_memusage_t ws, map_ws; 156 char filename[MAX_FILENAME]; 157 int fd; 158 int i, j; 159 int error; 160 161 if (!proc) 162 return -1; 163 164 if (ws_out) { 165 pm_memusage_zero(&ws); 166 for (i = 0; i < proc->num_maps; i++) { 167 error = pm_map_workingset(proc->maps[i], &map_ws); 168 if (error) return error; 169 170 pm_memusage_add(&ws, &map_ws); 171 } 172 173 memcpy(ws_out, &ws, sizeof(ws)); 174 } 175 176 if (reset) { 177 error = snprintf(filename, MAX_FILENAME, "/proc/%d/clear_refs", 178 proc->pid); 179 if (error < 0 || error >= MAX_FILENAME) { 180 return (error < 0) ? (errno) : (-1); 181 } 182 183 fd = open(filename, O_WRONLY); 184 if (fd < 0) 185 return errno; 186 187 write(fd, "1\n", strlen("1\n")); 188 189 close(fd); 190 } 191 192 return 0; 193 } 194 195 int pm_process_destroy(pm_process_t *proc) { 196 if (!proc) 197 return -1; 198 199 free(proc->maps); 200 close(proc->pagemap_fd); 201 free(proc); 202 203 return 0; 204 } 205 206 #define INITIAL_MAPS 10 207 #define MAX_LINE 256 208 #define MAX_PERMS 5 209 210 /* 211 * #define FOO 123 212 * S(FOO) => "123" 213 */ 214 #define _S(n) #n 215 #define S(n) _S(n) 216 217 static int read_maps(pm_process_t *proc) { 218 char filename[MAX_FILENAME]; 219 char line[MAX_LINE], name[MAX_LINE], perms[MAX_PERMS]; 220 FILE *maps_f; 221 pm_map_t *map, **maps, **new_maps; 222 int maps_count, maps_size; 223 int error; 224 225 if (!proc) 226 return -1; 227 228 maps = calloc(INITIAL_MAPS, sizeof(pm_map_t*)); 229 if (!maps) 230 return errno; 231 maps_count = 0; maps_size = INITIAL_MAPS; 232 233 error = snprintf(filename, MAX_FILENAME, "/proc/%d/maps", proc->pid); 234 if (error < 0 || error >= MAX_FILENAME) 235 return (error < 0) ? (errno) : (-1); 236 237 maps_f = fopen(filename, "r"); 238 if (!maps_f) 239 return errno; 240 241 while (fgets(line, MAX_LINE, maps_f)) { 242 if (maps_count >= maps_size) { 243 new_maps = realloc(maps, 2 * maps_size * sizeof(pm_map_t*)); 244 if (!new_maps) { 245 error = errno; 246 free(maps); 247 fclose(maps_f); 248 return error; 249 } 250 maps = new_maps; 251 maps_size *= 2; 252 } 253 254 maps[maps_count] = map = calloc(1, sizeof(*map)); 255 256 map->proc = proc; 257 258 sscanf(line, "%lx-%lx %s %lx %*s %*d %" S(MAX_LINE) "s", 259 &map->start, &map->end, perms, &map->offset, name); 260 261 map->name = malloc(strlen(name) + 1); 262 if (!map->name) { 263 error = errno; 264 for (; maps_count > 0; maps_count--) 265 pm_map_destroy(maps[maps_count]); 266 free(maps); 267 return error; 268 } 269 strcpy(map->name, name); 270 if (perms[0] == 'r') map->flags |= PM_MAP_READ; 271 if (perms[1] == 'w') map->flags |= PM_MAP_WRITE; 272 if (perms[2] == 'x') map->flags |= PM_MAP_EXEC; 273 274 maps_count++; 275 } 276 277 fclose(maps_f); 278 279 new_maps = realloc(maps, maps_count * sizeof(pm_map_t*)); 280 if (maps_count && !new_maps) { 281 error = errno; 282 free(maps); 283 return error; 284 } 285 286 proc->maps = new_maps; 287 proc->num_maps = maps_count; 288 289 return 0; 290 } 291
