#ifndef __wasi_libc_h
#define __wasi_libc_h

#include <__typedef_off_t.h>
#include <__struct_timespec.h>
#include <unistd.h>

#ifdef __cplusplus
extern "C" {
#endif

struct stat;
struct timespec;

/// Populate libc's preopen tables. This is normally done automatically
/// just before it's needed, however if you call `__wasi_fd_renumber` or
/// `__wasi_fd_close` directly, and you need the preopens to be accurate
/// afterward, you should call this before doing so.
void __wasilibc_populate_preopens(void);

/// Register the given pre-opened file descriptor under the given path.
///
/// This function does not take ownership of `prefix` (it makes its own copy).
int __wasilibc_register_preopened_fd(int fd, const char *prefix);

/// Renumber `fd` to `newfd`; similar to `dup2` but does a move rather than a
/// copy.
int __wasilibc_fd_renumber(int fd, int newfd)
    __attribute__((__warn_unused_result__));

/// Like `unlinkat`, but without depending on `__wasi_path_remove_directory`.
int __wasilibc_unlinkat(int fd, const char *path)
    __attribute__((__warn_unused_result__));

/// An `*at` version of rmdir.
int __wasilibc_rmdirat(int fd, const char *path)
    __attribute__((__warn_unused_result__));

/// Like `open`, but without the varargs in the signature.
int __wasilibc_open_nomode(const char *path, int oflag);

/// Like `openat`, but without the varargs in the signature.
int __wasilibc_openat_nomode(int fd, const char *path, int oflag);

/// Return the current file offset. Like `lseek(fd, 0, SEEK_CUR)`, but without
/// depending on `lseek`.
off_t __wasilibc_tell(int fd)
    __attribute__((__warn_unused_result__));

/* Non-`at` forms of various `*at` functions. */
int __wasilibc_access(const char *pathname, int mode, int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_stat(const char *__restrict pathname, struct stat *__restrict statbuf, int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_utimens(const char *pathname, const struct timespec times[2], int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_link(const char *oldpath, const char *newpath, int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_link_oldat(int olddirfd, const char *oldpath, const char *newpath, int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_link_newat(const char *oldpath, int newdirfd, const char *newpath, int flags)
    __attribute__((__warn_unused_result__));
int __wasilibc_rename_oldat(int olddirfd, const char *oldpath, const char *newpath)
    __attribute__((__warn_unused_result__));
int __wasilibc_rename_newat(const char *oldpath, int newdirfd, const char *newpath)
    __attribute__((__warn_unused_result__));

/// Enable busywait in futex on current thread.
void __wasilibc_enable_futex_busywait_on_current_thread(void);

/// Fill a buffer with random bytes
int __wasilibc_random(void* buffer, size_t len)
   __attribute__((__warn_unused_result__));

#ifdef __cplusplus
}
#endif

#endif
