从Unix中的用户名中获取UID和GID？ [英] Programatically getting UID and GID from username in Unix?

问题描述

我试图使用setuid（）和setgid（）设置一个程序的相应的ID从根下降特​​权，但使用它们我需要知道我想要更改的用户的uid和gid to。

是否有系统调用来执行此操作？我不想硬编码或从/ etc / passwd解析。

我也想编程，而不是使用：

id -u USERNAME

任何帮助将非常感谢

解决方案

查看 getpwnam（）和 getgrnam（）函数。

I'm trying to use setuid() and setgid() to set the respective id's of a program to drop privileges down from root, but to use them I need to know the uid and gid of the user I want to change to.

Is there a system call to do this? I don't want to hardcode it or parse from /etc/passwd .

Also I'd like to do this programatically rather than using:

id -u USERNAME

Any help would be greatly appreciated

解决方案

Have a look at the getpwnam() and getgrnam() functions.

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