LXR linux/tools/perf/util/thread

   1#include <dirent.h>
   2#include <stdlib.h>
   3#include <stdio.h>
   4#include "thread_map.h"
   5
   6/* Skip "." and ".." directories */
   7static int filter(const struct dirent *dir)
   8{
   9        if (dir->d_name[0] == '.')
  10                return 0;
  11        else
  12                return 1;
  13}
  14
  15struct thread_map *thread_map__new_by_pid(pid_t pid)
  16{
  17        struct thread_map *threads;
  18        char name[256];
  19        int items;
  20        struct dirent **namelist = NULL;
  21        int i;
  22
  23        sprintf(name, "/proc/%d/task", pid);
  24        items = scandir(name, &namelist, filter, NULL);
  25        if (items <= 0)
  26                return NULL;
  27
  28        threads = malloc(sizeof(*threads) + sizeof(pid_t) * items);
  29        if (threads != NULL) {
  30                for (i = 0; i < items; i++)
  31                        threads->map[i] = atoi(namelist[i]->d_name);
  32                threads->nr = items;
  33        }
  34
  35        for (i=0; i<items; i++)
  36                free(namelist[i]);
  37        free(namelist);
  38
  39        return threads;
  40}
  41
  42struct thread_map *thread_map__new_by_tid(pid_t tid)
  43{
  44        struct thread_map *threads = malloc(sizeof(*threads) + sizeof(pid_t));
  45
  46        if (threads != NULL) {
  47                threads->map[0] = tid;
  48                threads->nr     = 1;
  49        }
  50
  51        return threads;
  52}
  53
  54struct thread_map *thread_map__new(pid_t pid, pid_t tid)
  55{
  56        if (pid != -1)
  57                return thread_map__new_by_pid(pid);
  58        return thread_map__new_by_tid(tid);
  59}
  60
  61void thread_map__delete(struct thread_map *threads)
  62{
  63        free(threads);
  64}
  65