diff options
Diffstat (limited to 'example/hello_ll.c')
| -rw-r--r-- | example/hello_ll.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/example/hello_ll.c b/example/hello_ll.c deleted file mode 100644 index 51b452c..0000000 --- a/example/hello_ll.c +++ /dev/null @@ -1,222 +0,0 @@ -/* - 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. -*/ - -/** @file - * - * minimal example filesystem using low-level API - * - * Compile with: - * - * gcc -Wall hello_ll.c `pkg-config fuse3 --cflags --libs` -o hello_ll - * - * ## Source code ## - * \include hello_ll.c - */ - -#define FUSE_USE_VERSION 31 - -#include <fuse_lowlevel.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <fcntl.h> -#include <unistd.h> -#include <assert.h> - -static const char *hello_str = "Hello World!\n"; -static const char *hello_name = "hello"; - -static int hello_stat(fuse_ino_t ino, struct stat *stbuf) -{ - stbuf->st_ino = ino; - switch (ino) { - case 1: - stbuf->st_mode = S_IFDIR | 0755; - stbuf->st_nlink = 2; - break; - - case 2: - stbuf->st_mode = S_IFREG | 0444; - stbuf->st_nlink = 1; - stbuf->st_size = strlen(hello_str); - break; - - default: - return -1; - } - return 0; -} - -static void hello_ll_getattr(fuse_req_t req, fuse_ino_t ino, - struct fuse_file_info *fi) -{ - struct stat stbuf; - - (void) fi; - - memset(&stbuf, 0, sizeof(stbuf)); - if (hello_stat(ino, &stbuf) == -1) - fuse_reply_err(req, ENOENT); - else - fuse_reply_attr(req, &stbuf, 1.0); -} - -static void hello_ll_lookup(fuse_req_t req, fuse_ino_t parent, const char *name) -{ - struct fuse_entry_param e; - - if (parent != 1 || strcmp(name, hello_name) != 0) - fuse_reply_err(req, ENOENT); - else { - memset(&e, 0, sizeof(e)); - e.ino = 2; - e.attr_timeout = 1.0; - e.entry_timeout = 1.0; - hello_stat(e.ino, &e.attr); - - fuse_reply_entry(req, &e); - } -} - -struct dirbuf { - char *p; - size_t size; -}; - -static void dirbuf_add(fuse_req_t req, struct dirbuf *b, const char *name, - fuse_ino_t ino) -{ - struct stat stbuf; - size_t oldsize = b->size; - b->size += fuse_add_direntry(req, NULL, 0, name, NULL, 0); - b->p = (char *) realloc(b->p, b->size); - memset(&stbuf, 0, sizeof(stbuf)); - stbuf.st_ino = ino; - fuse_add_direntry(req, b->p + oldsize, b->size - oldsize, name, &stbuf, - b->size); -} - -#define min(x, y) ((x) < (y) ? (x) : (y)) - -static int reply_buf_limited(fuse_req_t req, const char *buf, size_t bufsize, - off_t off, size_t maxsize) -{ - if (off < bufsize) - return fuse_reply_buf(req, buf + off, - min(bufsize - off, maxsize)); - else - return fuse_reply_buf(req, NULL, 0); -} - -static void hello_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size, - off_t off, struct fuse_file_info *fi) -{ - (void) fi; - - if (ino != 1) - fuse_reply_err(req, ENOTDIR); - else { - struct dirbuf b; - - memset(&b, 0, sizeof(b)); - dirbuf_add(req, &b, ".", 1); - dirbuf_add(req, &b, "..", 1); - dirbuf_add(req, &b, hello_name, 2); - reply_buf_limited(req, b.p, b.size, off, size); - free(b.p); - } -} - -static void hello_ll_open(fuse_req_t req, fuse_ino_t ino, - struct fuse_file_info *fi) -{ - if (ino != 2) - fuse_reply_err(req, EISDIR); - else if ((fi->flags & O_ACCMODE) != O_RDONLY) - fuse_reply_err(req, EACCES); - else - fuse_reply_open(req, fi); -} - -static void hello_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size, - off_t off, struct fuse_file_info *fi) -{ - (void) fi; - - assert(ino == 2); - reply_buf_limited(req, hello_str, strlen(hello_str), off, size); -} - -static struct fuse_lowlevel_ops hello_ll_oper = { - .lookup = hello_ll_lookup, - .getattr = hello_ll_getattr, - .readdir = hello_ll_readdir, - .open = hello_ll_open, - .read = hello_ll_read, -}; - -int main(int argc, char *argv[]) -{ - struct fuse_args args = FUSE_ARGS_INIT(argc, argv); - struct fuse_session *se; - struct fuse_cmdline_opts opts; - int ret = -1; - - if (fuse_parse_cmdline(&args, &opts) != 0) - return 1; - if (opts.show_help) { - printf("usage: %s [options] <mountpoint>\n\n", argv[0]); - fuse_cmdline_help(); - fuse_lowlevel_help(); - ret = 0; - goto err_out1; - } else if (opts.show_version) { - printf("FUSE library version %s\n", fuse_pkgversion()); - fuse_lowlevel_version(); - ret = 0; - goto err_out1; - } - - if(opts.mountpoint == NULL) { - printf("usage: %s [options] <mountpoint>\n", argv[0]); - printf(" %s --help\n", argv[0]); - ret = 1; - goto err_out1; - } - - se = fuse_session_new(&args, &hello_ll_oper, - sizeof(hello_ll_oper), NULL); - if (se == NULL) - goto err_out1; - - if (fuse_set_signal_handlers(se) != 0) - goto err_out2; - - if (fuse_session_mount(se, opts.mountpoint) != 0) - goto err_out3; - - fuse_daemonize(opts.foreground); - - /* Block until ctrl+c or fusermount -u */ - if (opts.singlethread) - ret = fuse_session_loop(se); - else - ret = fuse_session_loop_mt(se, opts.clone_fd); - - fuse_session_unmount(se); -err_out3: - fuse_remove_signal_handlers(se); -err_out2: - fuse_session_destroy(se); -err_out1: - free(opts.mountpoint); - fuse_opt_free_args(&args); - - return ret ? 1 : 0; -} |