example/null.c

/*
    FUSE: Filesystem in Userspace
    Copyright (C) 2001  Miklos Szeredi (mszeredi@inf.bme.hu)

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

#include <fuse.h>

#include <unistd.h>
#include <time.h>
#include <errno.h>

#define UNUSED __attribute__((unused))

static int null_getattr(const char *path, struct stat *stbuf)
{
    if(strcmp(path, "/") != 0)
        return -ENOENT;
    
    stbuf->st_mode = S_IFREG | 0644;
    stbuf->st_nlink = 1;
    stbuf->st_uid = getuid();
    stbuf->st_gid = getgid();
    stbuf->st_size = (1 << 30); /* 1G */
    stbuf->st_blocks = 0;
    stbuf->st_atime = stbuf->st_mtime = stbuf->st_ctime = time(NULL);

    return 0;
}

static int null_truncate(const char *path, off_t UNUSED(size))
{
    if(strcmp(path, "/") != 0)
        return -ENOENT;

    return 0;
}

static int null_open(const char *path, int UNUSED(flags))
{
    if(strcmp(path, "/") != 0)
        return -ENOENT;

    return 0;
}

static int null_read(const char *path, char *UNUSED(buf), size_t size,
                     off_t UNUSED(offset))
{
    if(strcmp(path, "/") != 0)
        return -ENOENT;

    return size;
}

static int null_write(const char *path, const char *UNUSED(buf), size_t size,
                     off_t UNUSED(offset))
{
    if(strcmp(path, "/") != 0)
        return -ENOENT;

    return size;
}

static int null_statfs(struct statfs *st)
{
    return st->f_blocks = st->f_bavail = st->f_bsize = st->f_files =
	st->f_ffree = st->f_namelen = 0;
}

static struct fuse_operations null_oper = {
    getattr:	null_getattr,
    readlink:	NULL,
    getdir:     NULL,
    mknod:	NULL,
    mkdir:	NULL,
    symlink:	NULL,
    unlink:	NULL,
    rmdir:	NULL,
    rename:     NULL,
    link:	NULL,
    chmod:	NULL,
    chown:	NULL,
    truncate:	null_truncate,
    utime:	NULL,
    open:	null_open,
    read:	null_read,
    write:	null_write,
    statfs:	null_statfs,
};

int main(int argc, char *argv[])
{
    fuse_main(argc, argv, &null_oper);
    return 0;
}