linux getpwuid

#include <pwd.h>

struct passwd *getpwuid(uid_t uid);

struct passwd {
    char   *pw_name;    // 用户名
    char   *pw_passwd;  // 用户密码（通常为加密后的密码，现代系统中通常为空）
    uid_t   pw_uid;      // 用户 ID
    gid_t   pw_gid;      // 用户主组 ID
    char   *pw_gecos;   // 用户的全名或其他信息
    char   *pw_dir;     // 用户的主目录
    char   *pw_shell;   // 用户的默认 shell
};

#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>

int main() {
    uid_t uid = 1000; // 示例 UID
    struct passwd *pw = getpwuid(uid);
    if (pw == NULL) {
        perror("getpwuid"); // 打印错误信息
        return EXIT_FAILURE;
    }
    printf("User: %s\n", pw->pw_name);
    return EXIT_SUCCESS;
}

#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <unistd.h>

int main() {
    uid_t uid = getuid(); // 获取当前用户的 UID
    struct passwd *pw = getpwuid(uid);
    if (pw == NULL) {
        perror("getpwuid");
        return EXIT_FAILURE;
    }
    printf("User ID: %d\n", pw->pw_uid);
    printf("Username: %s\n", pw->pw_name);
    printf("Home Directory: %s\n", pw->pw_dir);
    printf("Shell: %s\n", pw->pw_shell);
    return EXIT_SUCCESS;
}