Access mode difference ?

[orangeC23]

Steps to reproduce

(1)The c file is :

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/uio.h>

int main() {
    const char* file_name = "Data/mydir";
    int open_style= O_RDONLY;
    int fd = get_fd(file_name, open_style);
    fd_prestat_dir_name6MppH24h5k(fd);
    snapshot(fd);
    return 0;
}

int fd_prestat_dir_name6MppH24h5k (int fd) {
    return fd_prestat_dir_name(fd);
}

int get_fd(const char* file_name, int open_style){
    // Open a file for reading
    int fd = open(file_name, open_style);
    if (fd == -1) {
        perror("Failed to open the file");
        return 1;
    }

    return fd;
}

int fd_prestat_dir_name(int fd) {
    printf("Enter fd_prestat_dir_name\n");

    int flags = fcntl(fd, F_GETFL);

    if (flags == -1) {
        perror("Error getting file descriptor flags");
        return 1;
    }

    printf("flags: %d\n", flags);

    if (flags & O_RDONLY){
        printf("Access Mode: O_RDONLY\n");
    }
    if (flags & O_WRONLY){
        printf("Access Mode: O_WRONLY\n");
    }
    if (flags & O_RDWR){
        printf("Access Mode: O_RDWR\n");
    }
    if (flags & O_APPEND){
        printf("Access Mode: O_APPEND\n");
    }
    if (flags & O_NONBLOCK){
        printf("Access Mode: O_NONBLOCK\n");
    }
    if (flags & O_SYNC){
        printf("Access Mode: O_SYNC\n");
    }
    if (flags & O_DSYNC){
        printf("Access Mode: O_DSYNC\n");
    }
    if (flags & O_RSYNC){
        printf("Access Mode: O_RSYNC\n");
    }

    printf("Leave fd_prestat_dir_name\n");
    return fd;
}

int snapshot(int myfd){   
    printf("Enter snapshot\n");

    struct stat file_info;
    if (fstat(myfd, &file_info) == -1) {
        perror("Error getting file attributes");
        close(myfd);
        return 1;
    }

    printf("File Size: %lld bytes \n", (long long)file_info.st_size);

    off_t cur_offset = lseek(myfd, 0, SEEK_CUR);
    if (cur_offset == -1) {
        perror("Error getting current offset");
    }
    printf("Current offset: %lld \n", (long long)cur_offset);

    if (close(myfd) == -1) {
        perror("Error closing file");
        return 1;
    }

    printf("Leave snapshot\n");
}

(2) compile the c file into wasm: ./wasi-sdk-16.0/bin/clang --target=wasm32-unkown-wasi --sysroot=./wasi-sdk-16.0/share/wasi-sysroot test.c -o test.wasm (3)exeute open.wasm wasmer run --dir=./Data test.wasm The permission of Data/mydir is 0700, user1 create the Data/mydir file and user1 execute the Wasm file.

Expected behavior

wasmtime, wazero, wamr, wasmedge print:

Enter fd_prestat_dir_name
flags: 67108864
Access Mode: O_RDONLY
Access Mode: O_RDWR
Leave fd_prestat_dir_name
Enter snapshot
File Size: 4096 bytes 
Error getting current offset: Bad file descriptor
Current offset: -1 
Leave snapshot

Actual behavior

wasmer prints:

Enter fd_prestat_dir_name
flags: 335544320
Access Mode: O_RDONLY
Access Mode: O_WRONLY
Access Mode: O_RDWR
Leave fd_prestat_dir_name
Enter snapshot
File Size: 4096 bytes 
Current offset: 0 
Leave snapshot

I'm not sure whether the difference between wasmer and other runtimes could pose a bug or only difference? Could you please provide some suggestion? Thanks a lot !

version

wasmer 4.2.2

ubuntu 20.04

[Arshia001]

probably related to #4259 and #4265.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.