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#ifndef FUSEAPP_H
#define FUSEAPP_H
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <typeinfo>
#include <exception>
#include <stdio.h>
#include <errno.h>
class FuseAppBase {
public:
FuseAppBase();
virtual ~FuseAppBase() = 0;
virtual void * init (struct fuse_conn_info * info);
virtual int opt_parse(void *, const char * arg, int key, struct fuse_args *);
virtual int access(const char *, int);
virtual int chmod(const char *, mode_t);
virtual int chown(const char *, uid_t, gid_t);
virtual int create(const char *, mode_t, struct fuse_file_info *);
virtual int fgetattr(const char *, struct stat *, struct fuse_file_info *);
virtual int flush(const char *, struct fuse_file_info *);
virtual int fsync(const char *, int, struct fuse_file_info *);
virtual int fsyncdir(const char *, int, struct fuse_file_info *);
virtual int ftruncate(const char *, off_t, struct fuse_file_info *);
virtual int getattr(const char *, struct stat *);
virtual int getxattr(const char *, const char *, char *, size_t);
virtual int link(const char *, const char *);
virtual int listxattr(const char *, char *, size_t);
virtual int mkdir(const char *, mode_t);
virtual int mknod(const char *, mode_t, dev_t);
virtual int open(const char *, struct fuse_file_info *);
virtual int opendir(const char *, struct fuse_file_info *);
virtual int read(const char *, char *, size_t, off_t, struct fuse_file_info *);
virtual int readdir(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *);
virtual int readlink(const char *, char *, size_t);
virtual int release(const char *, struct fuse_file_info *);
virtual int releasedir(const char *, struct fuse_file_info *);
virtual int removexattr(const char *, const char *);
virtual int rename(const char *, const char *);
virtual int rmdir(const char *);
virtual int setxattr(const char *, const char *, const char *, size_t, int);
virtual int statfs(const char *, struct statvfs *);
virtual int symlink(const char *, const char *);
virtual int truncate(const char *, off_t);
virtual int unlink(const char *);
virtual int write(const char *, const char *, size_t, off_t, struct fuse_file_info *);
virtual int lock(const char *, struct fuse_file_info *, int cmd, struct flock *);
virtual int utimens(const char *, const struct timespec tv[2]);
virtual int bmap(const char *, size_t blocksize, uint64_t *idx);
virtual int ioctl(const char *, int cmd, void *arg, struct fuse_file_info *, unsigned int flags, void * data);
virtual int poll(const char *, struct fuse_file_info *, struct fuse_pollhandle *, unsigned *);
virtual int write_buf(const char *, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *);
virtual int read_buf(const char *, struct fuse_bufvec **bufp, size_t size, off_t off, struct fuse_file_info *);
virtual int flock(const char *, struct fuse_file_info *, int op);
virtual int fallocate(const char *, int, off_t, off_t, struct fuse_file_info *);
virtual int onError(const std::exception & err) throw();
#define IFIMPL(func) typeid(&FuseAppBase::func) == typeid(&FuseApp::func) ? NULL :
template <typename FuseApp>
static int run(int & argc, char** & argv, FuseApp * fa)
{
auto args = runint(argc, argv, fa);
struct fuse_operations operations = {
IFIMPL(getattr) fuseCall<const char *, struct stat *>::helper<&FuseAppBase::getattr>,
IFIMPL(readlink) fuseCall<const char *, char *, size_t>::helper<&FuseAppBase::readlink>,
NULL, // getdir deprecated
IFIMPL(mknod) fuseCall<const char *, mode_t, dev_t>::helper<&FuseAppBase::mknod>,
IFIMPL(mkdir) fuseCall<const char *, mode_t>::helper<&FuseAppBase::mkdir>,
IFIMPL(unlink) fuseCall<const char *>::helper<&FuseAppBase::unlink>,
IFIMPL(rmdir) fuseCall<const char *>::helper<&FuseAppBase::rmdir>,
IFIMPL(symlink) fuseCall<const char *, const char *>::helper<&FuseAppBase::symlink>,
IFIMPL(rename) fuseCall<const char *, const char *>::helper<&FuseAppBase::rename>,
IFIMPL(link) fuseCall<const char *, const char *>::helper<&FuseAppBase::link>,
IFIMPL(chmod) fuseCall<const char *, mode_t>::helper<&FuseAppBase::chmod>,
IFIMPL(chown) fuseCall<const char *, uid_t, gid_t>::helper<&FuseAppBase::chown>,
IFIMPL(truncate) fuseCall<const char *, off_t>::helper<&FuseAppBase::truncate>,
NULL, // utime deprecated
IFIMPL(open) fuseCall<const char *, struct fuse_file_info *>::helper<&FuseAppBase::open>,
IFIMPL(read) fuseCall<const char *, char *, size_t, off_t, struct fuse_file_info *>::helper<&FuseAppBase::read>,
IFIMPL(write) fuseCall<const char *, const char *, size_t, off_t, struct fuse_file_info *>::helper<&FuseAppBase::write>,
IFIMPL(statfs) fuseCall<const char *, struct statvfs *>::helper<&FuseAppBase::statfs>,
IFIMPL(flush) fuseCall<const char *, struct fuse_file_info *>::helper<&FuseAppBase::flush>,
IFIMPL(release) fuseCall<const char *, struct fuse_file_info *>::helper<&FuseAppBase::release>,
IFIMPL(fsync) fuseCall<const char *, int, struct fuse_file_info *>::helper<&FuseAppBase::fsync>,
IFIMPL(setxattr) fuseCall<const char *, const char *, const char *, size_t, int>::helper<&FuseAppBase::setxattr>,
IFIMPL(getxattr) fuseCall<const char *, const char *, char *, size_t>::helper<&FuseAppBase::getxattr>,
IFIMPL(listxattr) fuseCall<const char *, char *, size_t>::helper<&FuseAppBase::listxattr>,
IFIMPL(removexattr) fuseCall<const char *, const char *>::helper<&FuseAppBase::removexattr>,
IFIMPL(opendir) fuseCall<const char *, struct fuse_file_info *>::helper<&FuseAppBase::opendir>,
IFIMPL(readdir) fuseCall<const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *>::helper<&FuseAppBase::readdir>,
IFIMPL(releasedir) fuseCall<const char *, struct fuse_file_info *>::helper<&FuseAppBase::releasedir>,
IFIMPL(fsyncdir) fuseCall<const char *, int, struct fuse_file_info *>::helper<&FuseAppBase::fsyncdir>,
fuseInit,
fuseDestroy,
IFIMPL(access) fuseCall<const char *, int>::helper<&FuseAppBase::access>,
IFIMPL(create) fuseCall<const char *, mode_t, struct fuse_file_info *>::helper<&FuseAppBase::create>,
IFIMPL(fgetattr) fuseCall<const char *, off_t, struct fuse_file_info *>::helper<&FuseAppBase::ftruncate>,
IFIMPL(fgetattr) fuseCall<const char *, struct stat *, struct fuse_file_info *>::helper<&FuseAppBase::fgetattr>,
#if (FUSE_MINOR_VERSION >= 6)
IFIMPL(lock) fuseCall<const char *, struct fuse_file_info *, int, struct flock *>::helper<&FuseAppBase::lock>,
IFIMPL(utimens) fuseCall<const char *, const struct timespec [2]>::helper<&FuseAppBase::utimens>,
IFIMPL(bmap) fuseCall<const char *, size_t, uint64_t *>::helper<&FuseAppBase::bmap>,
#if (FUSE_MINOR_VERSION >= 8)
0, // flag_nullpath_ok
#if (FUSE_MINOR_VERSION >= 9)
0, // flag_nopath
0, // flag_utime_omit_ok
#endif
0, // flag_reserved
IFIMPL(ioctl) fuseCall<const char *, int, void *, struct fuse_file_info *, unsigned int, void *>::helper<&FuseAppBase::ioctl>,
IFIMPL(poll) fuseCall<const char *, struct fuse_file_info *, struct fuse_pollhandle *, unsigned *>::helper<&FuseAppBase::poll>,
#if (FUSE_MINOR_VERSION >= 9)
IFIMPL(write_buf) fuseCall<const char *, struct fuse_bufvec *, off_t, struct fuse_file_info *>::helper<&FuseAppBase::write_buf>,
IFIMPL(read_buf) fuseCall<const char *, struct fuse_bufvec **, size_t, off_t, struct fuse_file_info *>::helper<&FuseAppBase::read_buf>,
IFIMPL(flock) fuseCall<const char *, struct fuse_file_info *, int>::helper<&FuseAppBase::flock>,
IFIMPL(fallocate) fuseCall<const char *, int, off_t, off_t, struct fuse_file_info *>::helper<&FuseAppBase::fallocate>,
#endif
#endif
#endif
};
return fuse_main(args.argc, args.argv, &operations, fa);
}
private:
static struct fuse_args runint(int &, char ** &, FuseAppBase *);
static void * fuseInit(struct fuse_conn_info *conn);
static void fuseDestroy(void *);
template <typename... Args>
class fuseCall {
public:
template <int (FuseAppBase::*f)(Args...)>
static int helper(Args ... a)
{
try {
return (fuseApp->*f)(a...);
}
catch (const std::exception & ex) {
if (int rtn = fuseApp->onError(ex)) {
return rtn;
}
return helper<f>(a...);
}
catch (...) {
fprintf(stderr, "Unknown exception calling %s\n", typeid(f).name());
return -ENOSYS;
}
}
};
static FuseAppBase * fuseApp;
};
#endif
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