newmask.c

嵌入式Linux程序设计与应用案例 电子书源码 中国电力出版社

/*************
//name : newmask.c
//author : pyy
//date : 2007-11-22
****************/

#include<sys/stat.h>
#include<sys/types.h>
#include<stdio.h>
#include<stdlib.h>

int main()
{
    mode_t new_mask=0222, old_mask;
    old_mask = umask(new_mask);
    printf("file1 ... \n");
    printf("old mask is %#o\n",old_mask);
    printf("new mask is %#o\n",new_mask);
    system("touch file1");

    new_mask=0002;
    old_mask = umask(new_mask);
    printf("file2 ... \n");
    printf("old mask is %#o\n",old_mask);
    printf("new mask is %#o\n",new_mask);
    system("touch file2");

     
    new_mask=0022;
    old_mask = umask(new_mask);
    printf("file3 ... \n");
    printf("old mask is %#o\n",old_mask);
    printf("new mask is %#o\n",new_mask);
    system("touch file3");
    exit(0);

}