在Linux中获取主目录 [英] Get home directory in Linux

问题描述

我需要一种在Linux上运行的C ++程序中获取用户主目录的方法.如果相同的代码可以在Unix上运行，那就太好了.我不想使用HOME环境值.

I need a way to get user home directory in C++ program running on Linux. If the same code works on Unix, it would be nice. I don't want to use HOME environment value.

AFAIK，根主目录为/root.如果我的程序是由root用户运行的，可以在此目录中创建一些文件/文件夹吗?

AFAIK, root home directory is /root. Is it OK to create some files/folders in this directory, in the case my program is running by root user?

推荐答案

您需要getuid获取当前用户的用户ID，然后需要getpwuid获取该用户的密码条目(包括主目录)用户:

You need getuid to get the user id of the current user and then getpwuid to get the password entry (which includes the home directory) of that user:

#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>

struct passwd *pw = getpwuid(getuid());

const char *homedir = pw->pw_dir;

注意:如果在线程化应用程序中需要此功能，则将改为使用getpwuid_r.

Note: if you need this in a threaded application, you'll want to use getpwuid_r instead.

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