[ 리눅스 명령어 ] umask, link, symlink 실습관련 예제..

umask, link, symlink 실습관련 예제..

 #include 
#include 
#include 
#include 
#include 

int main()
{
        char *originalname = "test.txt";
        char *hardfilename = "test.txt.hard";
        char *softfilename = "test.txt.soft";

        int filedes, retval;

        mode_t oldmask;
        char buffer[1024];
        int nread;
        struct stat finfo;

        oldmask = umask(0377);

        filedes = open(originalname, O_CREAT, 0755);
        close(filedes);

        if(retval = access(originalname, W_OK) == -1)
        {
                printf("%s is not writable\n", originalname);
                chmod(originalname, 0644);
        }
        link(originalname, hardfilename);
        symlink(originalname, softfilename);

        rename(hardfilename, "newname.txt");

        nread = readlink(softfilename, buffer, 1024);
        write(1, buffer, nread);

        stat(originalname, &finfo);
        printf("file mode: %o \n", finfo.st_mode);
        printf("file size: %d\n", finfo.st_size);
        printf("Num of blocks: %d\n", finfo.st_blocks);
        return 0;

}

출처 : 리눅스 프로그래밍 ( 한빛 미디어) ㅎㅎ;;