Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 1 | #include <dirent.h> |
Arnaldo Carvalho de Melo | 0d37aa3 | 2012-01-19 14:08:15 -0200 | [diff] [blame^] | 2 | #include <limits.h> |
| 3 | #include <stdbool.h> |
Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 4 | #include <stdlib.h> |
| 5 | #include <stdio.h> |
Arnaldo Carvalho de Melo | 0d37aa3 | 2012-01-19 14:08:15 -0200 | [diff] [blame^] | 6 | #include <sys/types.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <unistd.h> |
Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 9 | #include "thread_map.h" |
| 10 | |
| 11 | /* Skip "." and ".." directories */ |
| 12 | static int filter(const struct dirent *dir) |
| 13 | { |
| 14 | if (dir->d_name[0] == '.') |
| 15 | return 0; |
| 16 | else |
| 17 | return 1; |
| 18 | } |
| 19 | |
| 20 | struct thread_map *thread_map__new_by_pid(pid_t pid) |
| 21 | { |
| 22 | struct thread_map *threads; |
| 23 | char name[256]; |
| 24 | int items; |
| 25 | struct dirent **namelist = NULL; |
| 26 | int i; |
| 27 | |
| 28 | sprintf(name, "/proc/%d/task", pid); |
| 29 | items = scandir(name, &namelist, filter, NULL); |
| 30 | if (items <= 0) |
Arnaldo Carvalho de Melo | 0d37aa3 | 2012-01-19 14:08:15 -0200 | [diff] [blame^] | 31 | return NULL; |
Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 32 | |
| 33 | threads = malloc(sizeof(*threads) + sizeof(pid_t) * items); |
| 34 | if (threads != NULL) { |
| 35 | for (i = 0; i < items; i++) |
| 36 | threads->map[i] = atoi(namelist[i]->d_name); |
| 37 | threads->nr = items; |
| 38 | } |
| 39 | |
| 40 | for (i=0; i<items; i++) |
| 41 | free(namelist[i]); |
| 42 | free(namelist); |
| 43 | |
| 44 | return threads; |
| 45 | } |
| 46 | |
| 47 | struct thread_map *thread_map__new_by_tid(pid_t tid) |
| 48 | { |
| 49 | struct thread_map *threads = malloc(sizeof(*threads) + sizeof(pid_t)); |
| 50 | |
| 51 | if (threads != NULL) { |
| 52 | threads->map[0] = tid; |
| 53 | threads->nr = 1; |
| 54 | } |
| 55 | |
| 56 | return threads; |
| 57 | } |
| 58 | |
Arnaldo Carvalho de Melo | 0d37aa3 | 2012-01-19 14:08:15 -0200 | [diff] [blame^] | 59 | struct thread_map *thread_map__new_by_uid(uid_t uid) |
| 60 | { |
| 61 | DIR *proc; |
| 62 | int max_threads = 32, items, i; |
| 63 | char path[256]; |
| 64 | struct dirent dirent, *next, **namelist = NULL; |
| 65 | struct thread_map *threads = malloc(sizeof(*threads) + |
| 66 | max_threads * sizeof(pid_t)); |
| 67 | if (threads == NULL) |
| 68 | goto out; |
| 69 | |
| 70 | proc = opendir("/proc"); |
| 71 | if (proc == NULL) |
| 72 | goto out_free_threads; |
| 73 | |
| 74 | threads->nr = 0; |
| 75 | |
| 76 | while (!readdir_r(proc, &dirent, &next) && next) { |
| 77 | char *end; |
| 78 | bool grow = false; |
| 79 | struct stat st; |
| 80 | pid_t pid = strtol(dirent.d_name, &end, 10); |
| 81 | |
| 82 | if (*end) /* only interested in proper numerical dirents */ |
| 83 | continue; |
| 84 | |
| 85 | snprintf(path, sizeof(path), "/proc/%s", dirent.d_name); |
| 86 | |
| 87 | if (stat(path, &st) != 0) |
| 88 | continue; |
| 89 | |
| 90 | if (st.st_uid != uid) |
| 91 | continue; |
| 92 | |
| 93 | snprintf(path, sizeof(path), "/proc/%d/task", pid); |
| 94 | items = scandir(path, &namelist, filter, NULL); |
| 95 | if (items <= 0) |
| 96 | goto out_free_closedir; |
| 97 | |
| 98 | while (threads->nr + items >= max_threads) { |
| 99 | max_threads *= 2; |
| 100 | grow = true; |
| 101 | } |
| 102 | |
| 103 | if (grow) { |
| 104 | struct thread_map *tmp; |
| 105 | |
| 106 | tmp = realloc(threads, (sizeof(*threads) + |
| 107 | max_threads * sizeof(pid_t))); |
| 108 | if (tmp == NULL) |
| 109 | goto out_free_namelist; |
| 110 | |
| 111 | threads = tmp; |
| 112 | } |
| 113 | |
| 114 | for (i = 0; i < items; i++) |
| 115 | threads->map[threads->nr + i] = atoi(namelist[i]->d_name); |
| 116 | |
| 117 | for (i = 0; i < items; i++) |
| 118 | free(namelist[i]); |
| 119 | free(namelist); |
| 120 | |
| 121 | threads->nr += items; |
| 122 | } |
| 123 | |
| 124 | out_closedir: |
| 125 | closedir(proc); |
| 126 | out: |
| 127 | return threads; |
| 128 | |
| 129 | out_free_threads: |
| 130 | free(threads); |
| 131 | return NULL; |
| 132 | |
| 133 | out_free_namelist: |
| 134 | for (i = 0; i < items; i++) |
| 135 | free(namelist[i]); |
| 136 | free(namelist); |
| 137 | |
| 138 | out_free_closedir: |
| 139 | free(threads); |
| 140 | threads = NULL; |
| 141 | goto out_closedir; |
| 142 | } |
| 143 | |
| 144 | struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid) |
Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 145 | { |
| 146 | if (pid != -1) |
| 147 | return thread_map__new_by_pid(pid); |
Arnaldo Carvalho de Melo | 0d37aa3 | 2012-01-19 14:08:15 -0200 | [diff] [blame^] | 148 | |
| 149 | if (tid == -1 && uid != UINT_MAX) |
| 150 | return thread_map__new_by_uid(uid); |
| 151 | |
Arnaldo Carvalho de Melo | fd78260 | 2011-01-18 15:15:24 -0200 | [diff] [blame] | 152 | return thread_map__new_by_tid(tid); |
| 153 | } |
| 154 | |
| 155 | void thread_map__delete(struct thread_map *threads) |
| 156 | { |
| 157 | free(threads); |
| 158 | } |
Arnaldo Carvalho de Melo | 9ae7d33 | 2012-01-19 14:07:23 -0200 | [diff] [blame] | 159 | |
| 160 | size_t thread_map__fprintf(struct thread_map *threads, FILE *fp) |
| 161 | { |
| 162 | int i; |
| 163 | size_t printed = fprintf(fp, "%d thread%s: ", |
| 164 | threads->nr, threads->nr > 1 ? "s" : ""); |
| 165 | for (i = 0; i < threads->nr; ++i) |
| 166 | printed += fprintf(fp, "%s%d", i ? ", " : "", threads->map[i]); |
| 167 | |
| 168 | return printed + fprintf(fp, "\n"); |
| 169 | } |