diff options
Diffstat (limited to 'example/ioctl.c')
| -rw-r--r-- | example/ioctl.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/example/ioctl.c b/example/ioctl.c deleted file mode 100644 index eab3061..0000000 --- a/example/ioctl.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - FUSE fioc: FUSE ioctl example - Copyright (C) 2008 SUSE Linux Products GmbH - Copyright (C) 2008 Tejun Heo <teheo@suse.de> - - This program can be distributed under the terms of the GNU GPL. - See the file COPYING. -*/ - -/** @file - * @tableofcontents - * - * This example illustrates how to write a FUSE file system that can - * process (a restricted set of) ioctls. It can be tested with the - * ioctl_client.c program. - * - * Compile with: - * - * gcc -Wall ioctl.c `pkg-config fuse3 --cflags --libs` -o ioctl - * - * ## Source code ## - * \include ioctl.c - */ - -#define FUSE_USE_VERSION 31 - -#include <fuse.h> -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <unistd.h> -#include <time.h> -#include <errno.h> - -#include "ioctl.h" - -#define FIOC_NAME "fioc" - -enum { - FIOC_NONE, - FIOC_ROOT, - FIOC_FILE, -}; - -static void *fioc_buf; -static size_t fioc_size; - -static int fioc_resize(size_t new_size) -{ - void *new_buf; - - if (new_size == fioc_size) - return 0; - - new_buf = realloc(fioc_buf, new_size); - if (!new_buf && new_size) - return -ENOMEM; - - if (new_size > fioc_size) - memset(new_buf + fioc_size, 0, new_size - fioc_size); - - fioc_buf = new_buf; - fioc_size = new_size; - - return 0; -} - -static int fioc_expand(size_t new_size) -{ - if (new_size > fioc_size) - return fioc_resize(new_size); - return 0; -} - -static int fioc_file_type(const char *path) -{ - if (strcmp(path, "/") == 0) - return FIOC_ROOT; - if (strcmp(path, "/" FIOC_NAME) == 0) - return FIOC_FILE; - return FIOC_NONE; -} - -static int fioc_getattr(const char *path, struct stat *stbuf, - struct fuse_file_info *fi) -{ - (void) fi; - stbuf->st_uid = getuid(); - stbuf->st_gid = getgid(); - stbuf->st_atime = stbuf->st_mtime = time(NULL); - - switch (fioc_file_type(path)) { - case FIOC_ROOT: - stbuf->st_mode = S_IFDIR | 0755; - stbuf->st_nlink = 2; - break; - case FIOC_FILE: - stbuf->st_mode = S_IFREG | 0644; - stbuf->st_nlink = 1; - stbuf->st_size = fioc_size; - break; - case FIOC_NONE: - return -ENOENT; - } - - return 0; -} - -static int fioc_open(const char *path, struct fuse_file_info *fi) -{ - (void) fi; - - if (fioc_file_type(path) != FIOC_NONE) - return 0; - return -ENOENT; -} - -static int fioc_do_read(char *buf, size_t size, off_t offset) -{ - if (offset >= fioc_size) - return 0; - - if (size > fioc_size - offset) - size = fioc_size - offset; - - memcpy(buf, fioc_buf + offset, size); - - return size; -} - -static int fioc_read(const char *path, char *buf, size_t size, - off_t offset, struct fuse_file_info *fi) -{ - (void) fi; - - if (fioc_file_type(path) != FIOC_FILE) - return -EINVAL; - - return fioc_do_read(buf, size, offset); -} - -static int fioc_do_write(const char *buf, size_t size, off_t offset) -{ - if (fioc_expand(offset + size)) - return -ENOMEM; - - memcpy(fioc_buf + offset, buf, size); - - return size; -} - -static int fioc_write(const char *path, const char *buf, size_t size, - off_t offset, struct fuse_file_info *fi) -{ - (void) fi; - - if (fioc_file_type(path) != FIOC_FILE) - return -EINVAL; - - return fioc_do_write(buf, size, offset); -} - -static int fioc_truncate(const char *path, off_t size, - struct fuse_file_info *fi) -{ - (void) fi; - if (fioc_file_type(path) != FIOC_FILE) - return -EINVAL; - - return fioc_resize(size); -} - -static int fioc_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) fi; - (void) offset; - (void) flags; - - if (fioc_file_type(path) != FIOC_ROOT) - return -ENOENT; - - filler(buf, ".", NULL, 0, 0); - filler(buf, "..", NULL, 0, 0); - filler(buf, FIOC_NAME, NULL, 0, 0); - - return 0; -} - -static int fioc_ioctl(const char *path, unsigned int cmd, void *arg, - struct fuse_file_info *fi, unsigned int flags, void *data) -{ - (void) arg; - (void) fi; - (void) flags; - - if (fioc_file_type(path) != FIOC_FILE) - return -EINVAL; - - if (flags & FUSE_IOCTL_COMPAT) - return -ENOSYS; - - switch (cmd) { - case FIOC_GET_SIZE: - *(size_t *)data = fioc_size; - return 0; - - case FIOC_SET_SIZE: - fioc_resize(*(size_t *)data); - return 0; - } - - return -EINVAL; -} - -static struct fuse_operations fioc_oper = { - .getattr = fioc_getattr, - .readdir = fioc_readdir, - .truncate = fioc_truncate, - .open = fioc_open, - .read = fioc_read, - .write = fioc_write, - .ioctl = fioc_ioctl, -}; - -int main(int argc, char *argv[]) -{ - return fuse_main(argc, argv, &fioc_oper, NULL); -} |