umka/kofuse.c

#define FUSE_USE_VERSION 31

#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <assert.h>
#include "kocdecl.h"

static void *hello_init(struct fuse_conn_info *conn,
			struct fuse_config *cfg)
{
	(void) conn;
	cfg->kernel_cache = 1;
	return NULL;
}

static int hello_getattr(const char *path, struct stat *stbuf,
			 struct fuse_file_info *fi)
{
	(void) fi;
	int res = 0;

	memset(stbuf, 0, sizeof(struct stat));
	if (strcmp(path, "/") == 0) {
		stbuf->st_mode = S_IFDIR | 0755;
		stbuf->st_nlink = 2;
	} else if (strcmp(path+1, "blah") == 0) {
		stbuf->st_mode = S_IFREG | 0444;
		stbuf->st_nlink = 1;
		stbuf->st_size = strlen("blah");
	} else
		res = -ENOENT;

	return res;
}

static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
			 off_t offset, struct fuse_file_info *fi,
			 enum fuse_readdir_flags flags)
{
	(void) offset;
	(void) fi;
	(void) flags;

        char *bdfe = kos_fuse_readdir(path, offset);

//	if (strcmp(path, "/") != 0)
//		return -ENOENT;
        uint32_t i = *(uint32_t*)(bdfe + 4);
//        int f = open("/tmp/t", O_RDWR | O_CREAT);
//        write(f, bdfe, 1000);
//        write(f, &i, 4);
//        close(f);
        bdfe += 0x20;
        for(; i>0; i--) {
        	filler(buf, bdfe + 0x28, NULL, 0, 0);
                bdfe += 304;
        }

	return 0;
}

static int hello_open(const char *path, struct fuse_file_info *fi)
{
	if (strcmp(path+1, "blah") != 0)
		return -ENOENT;

	if ((fi->flags & O_ACCMODE) != O_RDONLY)
		return -EACCES;

	return 0;
}

static int hello_read(const char *path, char *buf, size_t size, off_t offset,
		      struct fuse_file_info *fi)
{
	size_t len;
	(void) fi;
	if(strcmp(path+1, "blah") != 0)
		return -ENOENT;

	len = strlen("blah");
	if (offset < len) {
		if (offset + size > len)
			size = len - offset;
		memcpy(buf, "blah" + offset, size);
	} else
		size = 0;

	return size;
}

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

int main(int argc, char *argv[])
{
        int fd = open(argv[2], O_RDONLY);
        kos_fuse_init(fd);
	return fuse_main(argc-1, argv, &hello_oper, NULL);
}