目标C和操作系统用户类型 [英] Objective C and OS user type

问题描述

有没有办法通过目标C获取当前登录的用户类型（root，admin或normal）？

Is there any way to get currently logged in user type (root, admin or normal) through objective C?

我知道 NSFullUserName

I know about NSFullUserName() which gives user name, but how to retrieve user type?

感谢。

推荐答案

您可以使用 getpwnam 或 getpwuid 检索用户组使用 getgrgid 从gid获取组名称。

You can retrieve the user group using getpwnam or getpwuid then use getgrgid to get the group name from the gid.

这些是标准库中的C函数。

These are C functions in the standard library.

- 编辑：以下是一个简短的，编码不良的C示例---

-- Here is a short, poorly coded C example ---

例如，在终端中的mac os应该使用make（如果你命名文件 getpwnam_example.c 你可以做 $ make getpwnam_example 在与c文件相同的目录中）。

Here is a small example, on mac os in the terminal it should build using make (if you name the file getpwnam_example.c you can do $ make getpwnam_example in the same directory as the c file).

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <strings.h>
#include <pwd.h>
#include <grp.h>

int main(int argc, char **argv) {

    uid_t current_user_id = getuid();
    printf("My Current UID is %d\n", current_user_id);

    struct passwd *pwentry = getpwuid(current_user_id);
    printf("My Current Name is %s\n", pwentry->pw_gecos);
    printf("My Current Group ID is %d\n", pwentry->pw_gid);

    struct group *grentry = getgrgid(getgid());
    printf("My Current Group Name is %s\n", grentry->gr_name);

    printf("Am I an admin? ");
    struct group *admin_group = getgrnam("admin");
    while(*admin_group->gr_mem != NULL) {
        if (strcmp(pwentry->pw_name, *admin_group->gr_mem) == 0) {
            printf("yes!\n");
        }
        admin_group->gr_mem++;
    }

    return 0;
}

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