我正在尝试使用 JNA 创建到 FUSE 库的绑定(bind)，但我在路上遇到了障碍。我尽可能地最小化了代码，以使其在此处易于理解。

FUSE 库附带了一些用 C 编写的示例文件系统。其中最简单的是 hello.c .以下是其代码的最小化版本，只是文件系统函数中的一些打印:
hello.c :

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.

  gcc -Wall hello.c -o hello `pkg-config fuse --cflags --libs`
*/
#define FUSE_USE_VERSION 26

#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

static int hello_getattr(const char *path, struct stat *stbuf)
{
    printf("getattr was called\n");
    return 0;
}

static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi)
{
    printf("readdir was called\n");
    return 0;
}

static int hello_open(const char *path, struct fuse_file_info *fi)
{
    printf("open was called\n");
    return 0;
}

static int hello_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
{
    printf("read was called\n");
    return 0;
}

static struct fuse_operations hello_oper = {
    .getattr    = hello_getattr,
    .readdir    = hello_readdir,
    .open       = hello_open,
    .read       = hello_read,
};

int main(int argc, char *argv[])
{
    return fuse_main_real(argc, argv, &hello_oper, sizeof(hello_oper), NULL);
}

import com.sun.jna.Callback;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;

public class FuseTemp
{
    public static interface Fuse extends Library
    {
        int fuse_main_real(int argc, String[] argv, StructFuseOperations op, long size, Pointer user_data);
    }

    @SuppressWarnings("unused")
    public static class StructFuseOperations extends Structure
    {
        public static class ByReference extends StructFuseOperations implements Structure.ByReference
        {
        }

        public Callback getattr = new Callback()
        {
            public int callback(final String path, final Pointer stat)
            {
                System.out.println("getattr was called");
                return 0;
            }
        };
        public Callback readlink = null;
        public Callback mknod = null;
        public Callback mkdir = null;
        public Callback unlink = null;
        public Callback rmdir = null;
        public Callback symlink = null;
        public Callback rename = null;
        public Callback link = null;
        public Callback chmod = null;
        public Callback chown = null;
        public Callback truncate = null;
        public Callback utime = null;
        public Callback open = new Callback()
        {
            public int callback(final String path, final Pointer info)
            {
                System.out.println("open was called");
                return 0;
            }
        };
        public Callback read = new Callback()
        {
            public int callback(final String path, final Pointer buffer, final long size, final long offset, final Pointer fi)
            {
                System.out.println("read was called");
                return 0;
            }
        };
        public Callback write = null;
        public Callback statfs = null;
        public Callback flush = null;
        public Callback release = null;
        public Callback fsync = null;
        public Callback setxattr = null;
        public Callback getxattr = null;
        public Callback listxattr = null;
        public Callback removexattr = null;
        public Callback opendir = null;
        public Callback readdir = new Callback()
        {
            public int callback(final String path, final Pointer buffer, final Pointer filler, final long offset,
                    final Pointer fi)
            {
                System.out.println("readdir was called");
                return 0;
            }
        };
        public Callback releasedir = null;
        public Callback fsyncdir = null;
        public Callback init = null;
        public Callback destroy = null;
        public Callback access = null;
        public Callback create = null;
        public Callback ftruncate = null;
        public Callback fgetattr = null;
        public Callback lock = null;
        public Callback utimens = null;
        public Callback bmap = null;
        public int flag_nullpath_ok;
        public int flag_reserved;
        public Callback ioctl = null;
        public Callback poll = null;
    }

    public static void main(final String[] args)
    {
        final String[] actualArgs = { "-f", "/some/mount/point" };
        final Fuse fuse = (Fuse) Native.loadLibrary("fuse", Fuse.class);
        final StructFuseOperations.ByReference operations = new StructFuseOperations.ByReference();
        System.out.println("Mounting");
        final int result = fuse.fuse_main_real(actualArgs.length, actualArgs, operations, operations.size(), null);
        System.out.println("Result: " + result);
        System.out.println("Mounted");
    }
}

  File: `/some/mount/point'
  Size: 4096            Blocks: 8          IO Block: 4096   directory
Device: 803h/2051d      Inode: 540652      Links: 2
Access: (0777/drwxrwxrwx)  Uid: ( 1000/ myusername)   Gid: ( 1000/ myusername)

Mounting
fusermount: failed to access mountpoint /some/mount/point: Permission denied
Result: 1
Mounted
(program exits with return code 0)

fusermount: entry for /some/mountpoint not found in /etc/mtab

Mounting
Result: 1
Mounted
(program exits with return code 0)

getattr was called

getattr was called

fusermount: entry for /some/mount/point not found in /etc/mtab

最佳答案

找到了。虽然回想起来这个错误真的很愚蠢，但并不容易发现。

解决方案 : fuse fuse_main_real方法的第一个参数是一个参数列表。在这个列表中，它期望参数 0 是文件系统名称，或者一些有意义的程序名称。因此，而不是

final String[] actualArgs = { "-f", "/some/mount/point" };

final String[] actualArgs = { "programName", "-f", "/some/mount/point" };

--no-canonicalize -i -f -t fuse.(arg 0) -o (options) (mountpoints) ...

/bin/mount --no-canonicalize -i -f -t fuse.-f -o rw,nosuid,nodev /some/mount/point

execl("/bin/mount", "/bin/mount", "--no-canonicalize", "-i",
      "-f", "-t", type, "-o", opts, fsname, mnt, NULL);

关于java - 在 Java 中使用 FUSE 库；尝试复制 hello.c 示例，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8872821/