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
pm_process_create(pm_kernel_t * ker,pid_t pid,pm_process_t ** proc_out)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
pm_process_usage(pm_process_t * proc,pm_memusage_t * usage_out)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
pm_process_pagemap_range(pm_process_t * proc,unsigned long low,unsigned long high,uint64_t ** range_out,size_t * len)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
pm_process_maps(pm_process_t * proc,pm_map_t *** maps_out,size_t * len)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
pm_process_workingset(pm_process_t * proc,pm_memusage_t * ws_out,int reset)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
pm_process_destroy(pm_process_t * proc)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
read_maps(pm_process_t * proc)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