116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
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/*
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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gcc -Wall hello.c `pkg-config fuse --cflags --libs` -o hello
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*/
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#define FUSE_USE_VERSION 26
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#include <fuse.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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char *kos_fuse_readdir(const char *path, off_t offset);
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void kos_fuse_init(int fd);
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static const char *hello_str = "Hello World!\n";
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static const char *hello_path = "/hello";
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static int hello_getattr(const char *path, struct stat *stbuf)
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{
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int res = 0;
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memset(stbuf, 0, sizeof(struct stat));
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if (strcmp(path, "/") == 0) {
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stbuf->st_mode = S_IFDIR | 0755;
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stbuf->st_nlink = 2;
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} else if (strcmp(path, hello_path) == 0) {
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stbuf->st_mode = S_IFREG | 0444;
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stbuf->st_nlink = 1;
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stbuf->st_size = strlen(hello_str);
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} else
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res = -ENOENT;
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return res;
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}
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static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi)
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{
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(void) offset;
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(void) fi;
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char *bdfe = kos_fuse_readdir(path, offset);
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// if (strcmp(path, "/") != 0)
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// return -ENOENT;
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uint32_t i = *(uint32_t*)(bdfe + 4);
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// int f = open("/tmp/t", O_RDWR | O_CREAT);
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// write(f, bdfe, 1000);
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// write(f, &i, 4);
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// close(f);
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bdfe += 0x20;
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for(; i>0; i--) {
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filler(buf, bdfe + 0x28, NULL, 0);
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bdfe += 304;
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}
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return 0;
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}
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static int hello_open(const char *path, struct fuse_file_info *fi)
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{
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if (strcmp(path, hello_path) != 0)
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return -ENOENT;
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if ((fi->flags & 3) != O_RDONLY)
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return -EACCES;
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return 0;
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}
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static int hello_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi)
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{
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size_t len;
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(void) fi;
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if(strcmp(path, hello_path) != 0)
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return -ENOENT;
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len = strlen(hello_str);
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if (offset < len) {
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if (offset + size > len)
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size = len - offset;
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memcpy(buf, hello_str + offset, size);
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} else
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size = 0;
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return size;
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}
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static struct fuse_operations hello_oper = {
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.getattr = hello_getattr,
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.readdir = hello_readdir,
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.open = hello_open,
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.read = hello_read,
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};
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int main(int argc, char *argv[])
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{
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int fd = open(argv[2], O_RDONLY);
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kos_fuse_init(fd);
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return fuse_main(argc-1, argv, &hello_oper, NULL);
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}
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