Print hard link file number error.

[Userzxcvbvnm]

Environment

Windows 10 and Ubuntu 20.04 WAMR-1.2.3 and WAMR-1.2.3 amd64 and x86_64

Test case

The test case is uploaded as readlink.wasm, it is compiled form readlink.c. readlink-wasm.txt readlink-c.txt

One hard link file (Data/link/hello_hardlink.txt) is pointed to Data/hello.txt, and one soft link file(Data/link/hello_softlink.txt) is pointed to Data/hello.txt. And the expected hard link number is 1. And in wasi api (https://github.com/WebAssembly/wasi-libc/blob/main/libc-bottom-half/headers/public/wasi/api.h), nlink means number of hard linke to the file. /**

• Number of hard links to the file. */ __wasi_linkcount_t nlink;

Reproduce steps

using command iwasm --dir=./Data readlink.wasm .

Expected result

Successfully get the file fd. File Type: 4 Number of hard links to the file: 1 File Size: 33 bytes

Actual result

Successfully get the file fd. File Type: 4 Number of hard links to the file: 2 File Size: 33 bytes

[TianlongLiang]

Hi, I think it is expected and it is right to be 2. The Data/hello.txt itself is a hard link. This is because every file starts with a single hard link, which is the link from its directory entry to the inode representing the file's data. This first link is indeed the file itself. When you create additional hard links to that file, they all refer to the same underlying inode and therefore the same data, and the count of hard links increases accordingly.

You can try this C program, using gcc to compile it to native code and test it out, it should return 2 too.

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

int main(int argc, char *argv[]) {
    struct stat fileStat;
    if(argc != 2) {
        fprintf(stderr, "Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    if(stat(argv[1], &fileStat) < 0) {
        perror("Failed to get file stats");
        return 1;
    }

    printf("Number of hard links: %ld\n", (long) fileStat.st_nlink);
    return 0;
}

[yamt]

i agree this is not a bug.