include/cuse_lowlevel.h

   1 /*
   2   CUSE: Character device in Userspace
   3   Copyright (C) 2008-2009  SUSE Linux Products GmbH
   4   Copyright (C) 2008-2009  Tejun Heo <tj@kernel.org>
   5
   6   This program can be distributed under the terms of the GNU LGPLv2.
   7   See the file COPYING.LIB.
   8
   9   Read example/cusexmp.c for usages.
  10 */
  11
  12 #ifndef _CUSE_LOWLEVEL_H_
  13 #define _CUSE_LOWLEVEL_H_
  14
  15 #ifndef FUSE_USE_VERSION
  16 #define FUSE_USE_VERSION 29
  17 #endif
  18
  19 #include "fuse_lowlevel.h"
  20
  21 #include <fcntl.h>
  22 #include <sys/types.h>
  23 #include <sys/uio.h>
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29 #define CUSE_UNRESTRICTED_IOCTL         (1 << 0) /* use unrestricted ioctl */
  30
  31 struct fuse_session;
  32
  33 struct cuse_info {
  34         unsigned        dev_major;
  35         unsigned        dev_minor;
  36         unsigned        dev_info_argc;
  37         const char      **dev_info_argv;
  38         unsigned        flags;
  39 };
  40
  41 /*
  42  * Most ops behave almost identically to the matching fuse_lowlevel
  43  * ops except that they don't take @ino.
  44  *
  45  * init_done    : called after initialization is complete
  46  * read/write   : always direct IO, simultaneous operations allowed
  47  * ioctl        : might be in unrestricted mode depending on ci->flags
  48  */
  49 struct cuse_lowlevel_ops {
  50         void (*init) (void *userdata, struct fuse_conn_info *conn);
  51         void (*init_done) (void *userdata);
  52         void (*destroy) (void *userdata);
  53         void (*open) (fuse_req_t req, struct fuse_file_info *fi);
  54         void (*read) (fuse_req_t req, size_t size, off_t off,
  55                       struct fuse_file_info *fi);
  56         void (*write) (fuse_req_t req, const char *buf, size_t size, off_t off,
  57                        struct fuse_file_info *fi);
  58         void (*flush) (fuse_req_t req, struct fuse_file_info *fi);
  59         void (*release) (fuse_req_t req, struct fuse_file_info *fi);
  60         void (*fsync) (fuse_req_t req, int datasync, struct fuse_file_info *fi);
  61         void (*ioctl) (fuse_req_t req, int cmd, void *arg,
  62                        struct fuse_file_info *fi, unsigned int flags,
  63                        const void *in_buf, size_t in_bufsz, size_t out_bufsz);
  64         void (*poll) (fuse_req_t req, struct fuse_file_info *fi,
  65                       struct fuse_pollhandle *ph);
  66 };
  67
  68 struct fuse_session *cuse_lowlevel_new(struct fuse_args *args,
  69                                        const struct cuse_info *ci,
  70                                        const struct cuse_lowlevel_ops *clop,
  71                                        void *userdata);
  72
  73 struct fuse_session *cuse_lowlevel_setup(int argc, char *argv[],
  74                                          const struct cuse_info *ci,
  75                                          const struct cuse_lowlevel_ops *clop,
  76                                          int *multithreaded, void *userdata);
  77
  78 void cuse_lowlevel_teardown(struct fuse_session *se);
  79
  80 int cuse_lowlevel_main(int argc, char *argv[], const struct cuse_info *ci,
  81                        const struct cuse_lowlevel_ops *clop, void *userdata);
  82
  83 #ifdef __cplusplus
  84 }
  85 #endif
  86
  87 #endif /* _CUSE_LOWLEVEL_H_ */