Socratic Challenge

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Problems Encountered During Learning and Solutions via GPT

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Practical Application of stat and opendir/readdir

[Images showing the practice with stat, opendir, readdir are included.]

Code Practice

Using the stat Structure

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

int main() {
    struct stat fileStat;

    // Retrieving file attributes
    if (stat("myfile.txt", &fileStat) == 0) {
        printf("File Size: %ld bytes\n", fileStat.st_size);
        printf("Number of Links: %ld\n", fileStat.st_nlink);
        printf("File Inode: %ld\n", fileStat.st_ino);
        printf("Owner UID: %d\n", fileStat.st_uid);
        printf("Owner GID: %d\n", fileStat.st_gid);
        printf("File Type and Mode: %o\n", fileStat.st_mode);
        printf("Last Access Time: %ld\n", fileStat.st_atime);
        printf("Last Modification Time: %ld\n", fileStat.st_mtime);
        printf("Last Status Change Time: %ld\n", fileStat.st_ctime);
    } else {
        perror("stat");
    }

    return 0;
}

Retrieving File Inode Number

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

int main() {
    struct stat fileStat;

    // Retrieving file attributes
    if (stat("myfile.txt", &fileStat) == 0) {
        printf("File Inode: %ld\n", fileStat.st_ino);
    } else {
        perror("stat");
    }

    return 0;
}

Using opendir and readdir

#include <stdio.h>
#include <dirent.h>

int main() {
    DIR *dir;
    struct dirent *entry;

    dir = opendir("/home/yuanyi/study");
    if (dir == NULL) {
        perror("opendir");
        return 1;
    }

    while ((entry = readdir(dir))) {
        printf("%s\n", entry->d_name);
    }

    closedir(dir);
    return 0;
}

Example: redalink for Symbolic Links

#include <stdio.h>
#include <unistd.h>

int main() {
    char linkname[1024];
    ssize_t len;

    // Reading the target path of a symbolic link
    len = readlink("mysymlink", linkname, sizeof(linkname) - 1);
    if (len != -1) {
        linkname[len] = '\0';  // Adding null terminator
        printf("Symbolic Link Target: %s\n", linkname);
    } else {
        perror("readlink");
        return 1;
    }

    return 0;
}