linux /proc 线程

#include <stdio.h>
#include <dirent.h>
#include <string.h>

int main() {
    DIR *proc = opendir("/proc");
    struct dirent *entry;

    if (proc == NULL) {
        perror("opendir /proc");
        return 1;
    }

    while ((entry = readdir(proc)) != NULL) {
        if (entry->d_type == DT_DIR && entry->d_name[0] >= '0' && entry->d_name[0] <= '9') {
            char path[256];
            snprintf(path, sizeof(path), "/proc/%s/task", entry->d_name);
            DIR *task_dir = opendir(path);
            if (task_dir) {
                int thread_count = 0;
                struct dirent *task_entry;
                while ((task_entry = readdir(task_dir)) != NULL) {
                    if (task_entry->d_type == DT_DIR && task_entry->d_name[0] != '.') {
                        thread_count++;
                    }
                }
                closedir(task_dir);
                printf("PID: %s, Thread Count: %d
", entry->d_name, thread_count);
            }
        }
    }

    closedir(proc);
    return 0;
}