mirror of https://gitee.com/openkylin/linux.git
298 lines
5.8 KiB
C
298 lines
5.8 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 "strlist.h"
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#include <string.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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static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
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{
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struct thread_map *threads = NULL, *nt;
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char name[256];
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int items, total_tasks = 0;
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struct dirent **namelist = NULL;
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int i, j = 0;
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pid_t pid, prev_pid = INT_MAX;
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char *end_ptr;
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struct str_node *pos;
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struct strlist *slist = strlist__new(false, pid_str);
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if (!slist)
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return NULL;
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strlist__for_each(pos, slist) {
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pid = strtol(pos->s, &end_ptr, 10);
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if (pid == INT_MIN || pid == INT_MAX ||
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(*end_ptr != '\0' && *end_ptr != ','))
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goto out_free_threads;
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if (pid == prev_pid)
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continue;
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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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goto out_free_threads;
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total_tasks += items;
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nt = realloc(threads, (sizeof(*threads) +
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sizeof(pid_t) * total_tasks));
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if (nt == NULL)
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goto out_free_threads;
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threads = nt;
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if (threads) {
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for (i = 0; i < items; i++)
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threads->map[j++] = atoi(namelist[i]->d_name);
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threads->nr = total_tasks;
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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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if (!threads)
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break;
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}
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out:
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strlist__delete(slist);
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return threads;
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out_free_threads:
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free(threads);
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threads = NULL;
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goto out;
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}
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static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
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{
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struct thread_map *threads = NULL, *nt;
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int ntasks = 0;
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pid_t tid, prev_tid = INT_MAX;
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char *end_ptr;
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struct str_node *pos;
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struct strlist *slist;
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/* perf-stat expects threads to be generated even if tid not given */
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if (!tid_str) {
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threads = malloc(sizeof(*threads) + sizeof(pid_t));
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if (threads != NULL) {
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threads->map[1] = -1;
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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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slist = strlist__new(false, tid_str);
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if (!slist)
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return NULL;
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strlist__for_each(pos, slist) {
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tid = strtol(pos->s, &end_ptr, 10);
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if (tid == INT_MIN || tid == INT_MAX ||
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(*end_ptr != '\0' && *end_ptr != ','))
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goto out_free_threads;
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if (tid == prev_tid)
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continue;
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ntasks++;
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nt = realloc(threads, sizeof(*threads) + sizeof(pid_t) * ntasks);
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if (nt == NULL)
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goto out_free_threads;
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threads = nt;
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threads->map[ntasks - 1] = tid;
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threads->nr = ntasks;
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}
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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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threads = NULL;
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goto out;
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}
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struct thread_map *thread_map__new_str(const char *pid, const char *tid,
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uid_t uid)
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{
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if (pid)
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return thread_map__new_by_pid_str(pid);
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if (!tid && uid != UINT_MAX)
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return thread_map__new_by_uid(uid);
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return thread_map__new_by_tid_str(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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