1#include <dirent.h>
2#include <limits.h>
3#include <stdbool.h>
4#include <stdlib.h>
5#include <stdio.h>
6#include <sys/types.h>
7#include <sys/stat.h>
8#include <unistd.h>
9#include "strlist.h"
10#include <string.h>
11#include "thread_map.h"
12#include "util.h"
13
14
15static int filter(const struct dirent *dir)
16{
17 if (dir->d_name[0] == '.')
18 return 0;
19 else
20 return 1;
21}
22
23struct thread_map *thread_map__new_by_pid(pid_t pid)
24{
25 struct thread_map *threads;
26 char name[256];
27 int items;
28 struct dirent **namelist = NULL;
29 int i;
30
31 sprintf(name, "/proc/%d/task", pid);
32 items = scandir(name, &namelist, filter, NULL);
33 if (items <= 0)
34 return NULL;
35
36 threads = malloc(sizeof(*threads) + sizeof(pid_t) * items);
37 if (threads != NULL) {
38 for (i = 0; i < items; i++)
39 threads->map[i] = atoi(namelist[i]->d_name);
40 threads->nr = items;
41 }
42
43 for (i=0; i<items; i++)
44 zfree(&namelist[i]);
45 free(namelist);
46
47 return threads;
48}
49
50struct thread_map *thread_map__new_by_tid(pid_t tid)
51{
52 struct thread_map *threads = malloc(sizeof(*threads) + sizeof(pid_t));
53
54 if (threads != NULL) {
55 threads->map[0] = tid;
56 threads->nr = 1;
57 }
58
59 return threads;
60}
61
62struct thread_map *thread_map__new_by_uid(uid_t uid)
63{
64 DIR *proc;
65 int max_threads = 32, items, i;
66 char path[256];
67 struct dirent dirent, *next, **namelist = NULL;
68 struct thread_map *threads = malloc(sizeof(*threads) +
69 max_threads * sizeof(pid_t));
70 if (threads == NULL)
71 goto out;
72
73 proc = opendir("/proc");
74 if (proc == NULL)
75 goto out_free_threads;
76
77 threads->nr = 0;
78
79 while (!readdir_r(proc, &dirent, &next) && next) {
80 char *end;
81 bool grow = false;
82 struct stat st;
83 pid_t pid = strtol(dirent.d_name, &end, 10);
84
85 if (*end)
86 continue;
87
88 snprintf(path, sizeof(path), "/proc/%s", dirent.d_name);
89
90 if (stat(path, &st) != 0)
91 continue;
92
93 if (st.st_uid != uid)
94 continue;
95
96 snprintf(path, sizeof(path), "/proc/%d/task", pid);
97 items = scandir(path, &namelist, filter, NULL);
98 if (items <= 0)
99 goto out_free_closedir;
100
101 while (threads->nr + items >= max_threads) {
102 max_threads *= 2;
103 grow = true;
104 }
105
106 if (grow) {
107 struct thread_map *tmp;
108
109 tmp = realloc(threads, (sizeof(*threads) +
110 max_threads * sizeof(pid_t)));
111 if (tmp == NULL)
112 goto out_free_namelist;
113
114 threads = tmp;
115 }
116
117 for (i = 0; i < items; i++)
118 threads->map[threads->nr + i] = atoi(namelist[i]->d_name);
119
120 for (i = 0; i < items; i++)
121 zfree(&namelist[i]);
122 free(namelist);
123
124 threads->nr += items;
125 }
126
127out_closedir:
128 closedir(proc);
129out:
130 return threads;
131
132out_free_threads:
133 free(threads);
134 return NULL;
135
136out_free_namelist:
137 for (i = 0; i < items; i++)
138 zfree(&namelist[i]);
139 free(namelist);
140
141out_free_closedir:
142 zfree(&threads);
143 goto out_closedir;
144}
145
146struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
147{
148 if (pid != -1)
149 return thread_map__new_by_pid(pid);
150
151 if (tid == -1 && uid != UINT_MAX)
152 return thread_map__new_by_uid(uid);
153
154 return thread_map__new_by_tid(tid);
155}
156
157static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
158{
159 struct thread_map *threads = NULL, *nt;
160 char name[256];
161 int items, total_tasks = 0;
162 struct dirent **namelist = NULL;
163 int i, j = 0;
164 pid_t pid, prev_pid = INT_MAX;
165 char *end_ptr;
166 struct str_node *pos;
167 struct strlist *slist = strlist__new(false, pid_str);
168
169 if (!slist)
170 return NULL;
171
172 strlist__for_each(pos, slist) {
173 pid = strtol(pos->s, &end_ptr, 10);
174
175 if (pid == INT_MIN || pid == INT_MAX ||
176 (*end_ptr != '\0' && *end_ptr != ','))
177 goto out_free_threads;
178
179 if (pid == prev_pid)
180 continue;
181
182 sprintf(name, "/proc/%d/task", pid);
183 items = scandir(name, &namelist, filter, NULL);
184 if (items <= 0)
185 goto out_free_threads;
186
187 total_tasks += items;
188 nt = realloc(threads, (sizeof(*threads) +
189 sizeof(pid_t) * total_tasks));
190 if (nt == NULL)
191 goto out_free_namelist;
192
193 threads = nt;
194
195 for (i = 0; i < items; i++) {
196 threads->map[j++] = atoi(namelist[i]->d_name);
197 zfree(&namelist[i]);
198 }
199 threads->nr = total_tasks;
200 free(namelist);
201 }
202
203out:
204 strlist__delete(slist);
205 return threads;
206
207out_free_namelist:
208 for (i = 0; i < items; i++)
209 zfree(&namelist[i]);
210 free(namelist);
211
212out_free_threads:
213 zfree(&threads);
214 goto out;
215}
216
217static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
218{
219 struct thread_map *threads = NULL, *nt;
220 int ntasks = 0;
221 pid_t tid, prev_tid = INT_MAX;
222 char *end_ptr;
223 struct str_node *pos;
224 struct strlist *slist;
225
226
227 if (!tid_str) {
228 threads = malloc(sizeof(*threads) + sizeof(pid_t));
229 if (threads != NULL) {
230 threads->map[0] = -1;
231 threads->nr = 1;
232 }
233 return threads;
234 }
235
236 slist = strlist__new(false, tid_str);
237 if (!slist)
238 return NULL;
239
240 strlist__for_each(pos, slist) {
241 tid = strtol(pos->s, &end_ptr, 10);
242
243 if (tid == INT_MIN || tid == INT_MAX ||
244 (*end_ptr != '\0' && *end_ptr != ','))
245 goto out_free_threads;
246
247 if (tid == prev_tid)
248 continue;
249
250 ntasks++;
251 nt = realloc(threads, sizeof(*threads) + sizeof(pid_t) * ntasks);
252
253 if (nt == NULL)
254 goto out_free_threads;
255
256 threads = nt;
257 threads->map[ntasks - 1] = tid;
258 threads->nr = ntasks;
259 }
260out:
261 return threads;
262
263out_free_threads:
264 zfree(&threads);
265 goto out;
266}
267
268struct thread_map *thread_map__new_str(const char *pid, const char *tid,
269 uid_t uid)
270{
271 if (pid)
272 return thread_map__new_by_pid_str(pid);
273
274 if (!tid && uid != UINT_MAX)
275 return thread_map__new_by_uid(uid);
276
277 return thread_map__new_by_tid_str(tid);
278}
279
280void thread_map__delete(struct thread_map *threads)
281{
282 free(threads);
283}
284
285size_t thread_map__fprintf(struct thread_map *threads, FILE *fp)
286{
287 int i;
288 size_t printed = fprintf(fp, "%d thread%s: ",
289 threads->nr, threads->nr > 1 ? "s" : "");
290 for (i = 0; i < threads->nr; ++i)
291 printed += fprintf(fp, "%s%d", i ? ", " : "", threads->map[i]);
292
293 return printed + fprintf(fp, "\n");
294}
295
