如何在Posix上使用C创建具有正确权限的目录 [英] How to create directory with right permissions using C on Posix

问题描述

我试图编写一个简单的C程序来创建目录(一个mkdir克隆).这是我到目前为止的内容:

I am trying to write a simple C program that creates directories (a mkdir clone.). This is what I have so far:

#include <stdlib.h>
#include <sys/stat.h> // mkdir
#include <stdio.h> // perror

mode_t getumask()
{
    mode_t mask = umask(0);
    umask (mask);
    return mask;
}

int main(int argc, const char *argv[])
{
    mode_t mask = getumask();
    printf("%i",mask);

    if (mkdir("trial",mask) == -1) {
        perror(argv[0]);
        exit(EXIT_FAILURE);
    }
    return 0;
}

此代码使用d---------创建目录，但我希望它像mkdir一样使用drwxr-xr-x创建目录?我在这里做什么错了?

This code creates directory with d--------- but I want it to create it with drwxr-xr-x like mkdir do? What am I doing wrong here?

这是适合我的解决方案:

This is the working solution for me:

int main(int argc, const char *argv[])
{
    if (mkdir("trial",0777) == -1) {
        perror(argv[0]);
        exit(EXIT_FAILURE);
    }
    return 0;
}

根据umask设置权限的权限会自动处理.因此，我只需要调用具有完全权限的mkdir即可，并且根据当前的umask将其切碎.

Setting right permissions according to umask is automatically handled. So I only needed to call mkdir with full permissions, and that gets chopped according to current umask.

推荐答案

正如Eric所说，umask是您获得的实际权限模式的补充.因此，您应该将0777-mask传递给mkdir()，而不是将遮罩本身传递给mkdir().

As Eric says, umask is the complement of the actual permission mode you get. So instead of passing mask itself to mkdir(), you should pass 0777-mask to mkdir().

这篇关于如何在Posix上使用C创建具有正确权限的目录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！