linux c获取所有进程信息

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

void list_processes() {
    DIR *proc_dir;
    struct dirent *entry;
    char path[256];
    FILE *status_file;
    char line[256];
    char pid_str[16];
    char name[256];

    proc_dir = opendir("/proc");
    if (proc_dir == NULL) {
        perror("Failed to open /proc directory");
        return;
    }

    while ((entry = readdir(proc_dir)) != NULL) {
        if (entry->d_type == DT_DIR && sscanf(entry->d_name, "%15s", pid_str) == 1) {
            // 构建 /proc/[pid]/status 文件的路径
            snprintf(path, sizeof(path), "/proc/%s/status", pid_str);

            status_file = fopen(path, "r");
            if (status_file == NULL) continue;

            // 读取 Name 行
            while (fgets(line, sizeof(line), status_file)) {
                if (strncmp(line, "Name:", 5) == 0) {
                    sscanf(line, "Name: %255s", name);
                    break;
                }
            }

            fclose(status_file);

            // 打印 PID 和进程名
            printf("PID: %s, Name: %s\n", pid_str, name);
        }
    }

    closedir(proc_dir);
}

int main() {
    list_processes();
    return 0;
}