#define FUSE_USE_VERSION FUSE_MAKE_VERSION(3, 4)
#include <fuse.h>
#include <fuse_lowlevel.h> /* for fuse_cmdline_help */

#if (FUSE_VERSION < FUSE_MAKE_VERSION(3, 4))
#error This package requires libfuse >= v3.4
#endif

#define SHAREFS_MEDIA_RW_ID (1 << 10) - 1 /* owning gid presented to userspace */
#define SHAREFS_PERM_DIR 0700             /* permission bits for directories presented to userspace */
#define SHAREFS_PERM_REG 0600             /* permission bits for regular files presented to userspace */
#define SHAREFS_FORBIDDEN_FLAGS O_DIRECT  /* these open flags are cleared unconditionally */

/* sharefs_private is populated by sharefs_init and contains process-wide context */
struct sharefs_private {
    int dirfd;               /* source dirfd opened during sharefs_init */
    bool init_failed;        /* whether sharefs_init failed */
    uintptr_t source_handle; /* cgo handle of pathname to open for dirfd, freed during sharefs_init */
    uintptr_t setuid;        /* uid to set by sharefs_init when running as root */
    uintptr_t setgid;        /* gid to set by sharefs_init when running as root */
};

int sharefs_getattr(const char *pathname, struct stat *statbuf, struct fuse_file_info *fi);
int sharefs_readdir(const char *pathname, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi, enum fuse_readdir_flags flags);
int sharefs_mkdir(const char *pathname, mode_t mode);
int sharefs_unlink(const char *pathname);
int sharefs_rmdir(const char *pathname);
int sharefs_rename(const char *oldpath, const char *newpath, unsigned int flags);
int sharefs_truncate(const char *pathname, off_t length, struct fuse_file_info *fi);
int sharefs_utimens(const char *pathname, const struct timespec times[2], struct fuse_file_info *fi);
int sharefs_create(const char *pathname, mode_t mode, struct fuse_file_info *fi);
int sharefs_open(const char *pathname, struct fuse_file_info *fi);
int sharefs_read(const char *pathname, char *buf, size_t count, off_t offset, struct fuse_file_info *fi);
int sharefs_write(const char *pathname, const char *buf, size_t count, off_t offset, struct fuse_file_info *fi);
int sharefs_statfs(const char *pathname, struct statvfs *statbuf);
int sharefs_release(const char *pathname, struct fuse_file_info *fi);
int sharefs_fsync(const char *pathname, int datasync, struct fuse_file_info *fi);