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Open with O_WRONLY | * bug get with Read/Write #4889

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@Userzxcvbvnm

Description

@Userzxcvbvnm

Describe the bug

wasmer fail to print the file size of hard link file.

Steps to reproduce

(1)The test case is :


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

int get_fd(const char *filename, int flags) {
    int fd = open(filename, flags);
    
    if (fd == -1) {
        printf("Get file descriptor of file %s failed!\n", filename);
        return -1;
    } else {
        printf("Get file descriptor of file %s succeed!\n", filename);
        return fd;
    }
}

void closebyfd(int fd) {
    if (close(fd) == -1) {
        printf("Close the file %d by descriptor failed!\n", fd);
    }
}

void fd_fdstat_get_00002_yBbmO(int fd) {
    printf("Enter function fd_fdstat_get_00002_yBbmO\n");

    int flags = fcntl(fd, F_GETFL);
    if (flags == -1) {
        printf("Error getting file descriptor flags\n");
        return;
    }

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

    int access_mode = flags & O_ACCMODE;

    
    if (access_mode == O_RDONLY) {
        printf("Access mode: Read Only\n");
    }
    if (access_mode == O_WRONLY) {
        printf("Access mode: Write Only\n");
    }
    if (access_mode == O_RDWR) {
        printf("Access mode: Read/Write\n");
    }
    if (flags & O_TRUNC) {
        printf("Flag: O_TRUNC\n");
    }
    if (flags & O_APPEND) {
        printf("Flag: O_APPEND\n");
    }
    if (flags & O_CREAT) {
        printf("Flag: O_CREAT\n");
    }
    if (flags & O_NONBLOCK) {
        printf("Flag: Non-blocking\n");
    }
    if (flags & O_SYNC) {
        printf("Flag: Synchronous Write\n");
    }
    if (flags & O_DSYNC) {
        printf("Flag: Data Synchronization Write\n");
    }
}

int main() {
    int fd = get_fd("subdir_1/subdir_2/subdir_3/subdir_4/subfile_2", O_WRONLY);
    if (fd == -1) {
        return -1;
    }

    fd_fdstat_get_00002_yBbmO(fd);

    closebyfd(fd);

    return 0;
}



(2)compile to wasm:./wasi-sdk-21.0/bin/clang --target=wasm32-unkown-wasi --sysroot=./wasi-sdk-21.0/share/wasi-sysroot test.c -o test.wasm

(3)Running wasm:
(Before run the Wasm file, subdir_1/subdir_2/subdir_3/subdir_4/subfile_2 exists.)
wasmer run --dir=. test.wasm

Expected behavior

print:

Get file descriptor of file subdir_1/subdir_2/subdir_3/subdir_4/subfile_2 succeed!
Enter function fd_fdstat_get_00002_yBbmO
File descriptor flags: 268435456
Access mode: Write Only

This is what wasmtime, WAMR and WasmEdge do.

Actual behavior

wasmer print:

Get file descriptor of file subdir_1/subdir_2/subdir_3/subdir_4/subfile_2 succeed!
Enter function fd_fdstat_get_00002_yBbmO
File descriptor flags: 335544320
Access mode: Read/Write

Additional context

Ubuntu 20.04
x86_64
wasmer-4.2.2

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bugSomething isn't workingpriority-highHigh priority issue📦 lib-vfsAbout wasmer-vfs

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