diff options
Diffstat (limited to 'example-26/hello_ll.c')
| -rw-r--r-- | example-26/hello_ll.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/example-26/hello_ll.c b/example-26/hello_ll.c new file mode 100644 index 000000000..934e9a720 --- /dev/null +++ b/example-26/hello_ll.c @@ -0,0 +1,180 @@ +/* + FUSE: Filesystem in Userspace + Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> + + This program can be distributed under the terms of the GNU GPL. + See the file COPYING. + + gcc -Wall `pkg-config fuse --cflags --libs` hello_ll.c -o hello_ll +*/ + +#define FUSE_USE_VERSION 26 + +#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 & 3) != 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_chan *ch; + char *mountpoint; + int err = -1; + + if (fuse_parse_cmdline(&args, &mountpoint, NULL, NULL) != -1 && + (ch = fuse_mount(mountpoint, &args)) != NULL) { + struct fuse_session *se; + + se = fuse_lowlevel_new(&args, &hello_ll_oper, sizeof(hello_ll_oper), + NULL); + if (se != NULL) { + if (fuse_set_signal_handlers(se) != -1) { + fuse_session_add_chan(se, ch); + err = fuse_session_loop(se); + fuse_remove_signal_handlers(se); + fuse_session_remove_chan(ch); + } + fuse_session_destroy(se); + } + fuse_unmount(mountpoint, ch); + } + fuse_opt_free_args(&args); + + return err ? 1 : 0; +} |