170 lines
3.3 KiB
C
170 lines
3.3 KiB
C
#include <dirent.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "thread_map.h"
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/* Skip "." and ".." directories */
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static int filter(const struct dirent *dir)
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{
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if (dir->d_name[0] == '.')
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return 0;
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else
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return 1;
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}
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struct thread_map *thread_map__new_by_pid(pid_t pid)
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{
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struct thread_map *threads;
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char name[256];
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int items;
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struct dirent **namelist = NULL;
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int i;
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sprintf(name, "/proc/%d/task", pid);
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items = scandir(name, &namelist, filter, NULL);
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if (items <= 0)
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return NULL;
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threads = malloc(sizeof(*threads) + sizeof(pid_t) * items);
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if (threads != NULL) {
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for (i = 0; i < items; i++)
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threads->map[i] = atoi(namelist[i]->d_name);
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threads->nr = items;
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}
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for (i=0; i<items; i++)
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free(namelist[i]);
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free(namelist);
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return threads;
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}
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struct thread_map *thread_map__new_by_tid(pid_t tid)
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{
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struct thread_map *threads = malloc(sizeof(*threads) + sizeof(pid_t));
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if (threads != NULL) {
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threads->map[0] = tid;
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threads->nr = 1;
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}
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return threads;
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}
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struct thread_map *thread_map__new_by_uid(uid_t uid)
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{
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DIR *proc;
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int max_threads = 32, items, i;
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char path[256];
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struct dirent dirent, *next, **namelist = NULL;
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struct thread_map *threads = malloc(sizeof(*threads) +
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max_threads * sizeof(pid_t));
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if (threads == NULL)
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goto out;
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proc = opendir("/proc");
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if (proc == NULL)
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goto out_free_threads;
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threads->nr = 0;
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while (!readdir_r(proc, &dirent, &next) && next) {
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char *end;
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bool grow = false;
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struct stat st;
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pid_t pid = strtol(dirent.d_name, &end, 10);
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if (*end) /* only interested in proper numerical dirents */
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continue;
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snprintf(path, sizeof(path), "/proc/%s", dirent.d_name);
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if (stat(path, &st) != 0)
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continue;
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if (st.st_uid != uid)
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continue;
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snprintf(path, sizeof(path), "/proc/%d/task", pid);
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items = scandir(path, &namelist, filter, NULL);
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if (items <= 0)
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goto out_free_closedir;
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while (threads->nr + items >= max_threads) {
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max_threads *= 2;
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grow = true;
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}
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if (grow) {
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struct thread_map *tmp;
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tmp = realloc(threads, (sizeof(*threads) +
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max_threads * sizeof(pid_t)));
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if (tmp == NULL)
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goto out_free_namelist;
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threads = tmp;
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}
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for (i = 0; i < items; i++)
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threads->map[threads->nr + i] = atoi(namelist[i]->d_name);
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for (i = 0; i < items; i++)
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free(namelist[i]);
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free(namelist);
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threads->nr += items;
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}
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out_closedir:
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closedir(proc);
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out:
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return threads;
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out_free_threads:
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free(threads);
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return NULL;
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out_free_namelist:
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for (i = 0; i < items; i++)
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free(namelist[i]);
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free(namelist);
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out_free_closedir:
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free(threads);
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threads = NULL;
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goto out_closedir;
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}
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struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
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{
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if (pid != -1)
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return thread_map__new_by_pid(pid);
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if (tid == -1 && uid != UINT_MAX)
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return thread_map__new_by_uid(uid);
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return thread_map__new_by_tid(tid);
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}
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void thread_map__delete(struct thread_map *threads)
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{
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free(threads);
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}
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size_t thread_map__fprintf(struct thread_map *threads, FILE *fp)
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{
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int i;
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size_t printed = fprintf(fp, "%d thread%s: ",
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threads->nr, threads->nr > 1 ? "s" : "");
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for (i = 0; i < threads->nr; ++i)
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printed += fprintf(fp, "%s%d", i ? ", " : "", threads->map[i]);
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return printed + fprintf(fp, "\n");
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}
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