Files
adler32
ahash
aho_corasick
ansi_term
antidote
anyhow
arc_swap
arrayvec
async_speed_limit
async_stream
async_stream_impl
async_trait
atty
aws
backtrace
backtrace_sys
backup
base64
batch_system
bitfield
bitflags
block_buffer
boolinator
bstr
byteorder
bytes
bzip2_sys
cargo_metadata
cdc
cfg_if
chrono
chrono_tz
clap
cloud
codec
collections
concurrency_manager
configuration
configuration_derive
const_fn
const_random
const_random_macro
coprocessor_plugin_api
cpuid_bool
crc32fast
crc64fast
crossbeam
crossbeam_channel
crossbeam_deque
crossbeam_epoch
crossbeam_queue
crossbeam_skiplist
crossbeam_utils
crypto_mac
darling
darling_core
darling_macro
dashmap
debugid
derive_more
digest
dirs
dirs_sys
doc_comment
dtoa
either
encoding_rs
encryption
encryption_export
engine_panic
engine_rocks
engine_test
engine_traits
engine_traits_tests
error_code
error_code_gen
example_plugin
external_storage
external_storage_export
fail
failure
failure_derive
farmhash
file_system
filetime
flate2
fnv
foreign_types
foreign_types_shared
fs2
futures
futures_channel
futures_core
futures_executor
futures_io
futures_macro
futures_sink
futures_task
futures_timer
futures_util
async_await
compat
future
io
lock
sink
stream
task
fuzz
fxhash
gcp
generic_array
getrandom
getset
grpcio
grpcio_health
grpcio_sys
h2
heck
hex
hmac
http
http_body
httparse
httpdate
hyper
hyper_openssl
hyper_tls
ident_case
idna
indexmap
inferno
inotify
inotify_sys
instant
into_other
iovec
ipnet
ipnetwork
itertools
itoa
keys
kvproto
lazy_static
lazycell
libc
libflate
libflate_lz77
libloading
librocksdb_sys
libtitan_sys
libz_sys
linked_hash_map
linked_hash_set
lock_api
log
log_wrappers
lz4_sys
match_template
matches
md5
memchr
memmap
memoffset
memory_trace_macros
mime
mime_guess
mio
mio_extras
mio_uds
more_asserts
murmur3
native_tls
net2
nix
nodrop
nom
notify
num
num_complex
num_cpus
num_derive
num_format
num_integer
num_iter
num_rational
num_traits
once_cell
opaque_debug
openssl
openssl_probe
openssl_sys
ordered_float
panic_hook
parking_lot
parking_lot_core
paste
paste_impl
pd_client
percent_encoding
pest
pin_project
pin_project_lite
pin_utils
pnet_base
pnet_datalink
pnet_sys
pprof
ppv_lite86
proc_macro2
proc_macro_error
proc_macro_error_attr
proc_macro_hack
proc_macro_nested
procfs
procinfo
profiler
prometheus
prometheus_static_metric
promptly
prost
prost_derive
protobuf
quick_xml
quote
raft
raft_engine
raft_log_engine
raft_proto
raftstore
rand
rand_chacha
rand_core
rand_isaac
rayon
rayon_core
regex
regex_automata
regex_syntax
remove_dir_all
reqwest
resolved_ts
rev_lines
rgb
ring
rle_decode_fast
rocksdb
rusoto_core
rusoto_credential
rusoto_kms
rusoto_s3
rusoto_signature
rusoto_sts
rustc_demangle
rustyline
ryu
safemem
same_file
scopeguard
security
semver
semver_parser
serde
serde_derive
serde_ignored
serde_json
serde_urlencoded
serde_with
serde_with_macros
server
sha2
shlex
signal
signal_hook_registry
slab
slog
slog_async
slog_derive
slog_global
slog_json
slog_term
smallvec
snappy_sys
socket2
spin
sst_importer
stable_deref_trait
standback
static_assertions
str_stack
strsim
structopt
structopt_derive
strum
strum_macros
subtle
symbolic_common
symbolic_demangle
syn
syn_mid
synstructure
sysinfo
take_mut
tame_gcs
tame_oauth
tempfile
term
test_backup
test_coprocessor
test_pd
test_raftstore
test_sst_importer
test_storage
test_util
textwrap
thiserror
thiserror_impl
thread_local
tidb_query_aggr
tidb_query_codegen
tidb_query_common
tidb_query_datatype
tidb_query_executors
tidb_query_expr
tikv
coprocessor
coprocessor_v2
import
server
storage
tikv_alloc
tikv_ctl
tikv_jemalloc_ctl
tikv_jemalloc_sys
tikv_jemallocator
tikv_kv
tikv_server
tikv_util
time
time_macros
time_macros_impl
tipb
tipb_helper
tokio
fs
future
io
loom
macros
net
park
process
runtime
signal
stream
sync
task
time
util
tokio_executor
tokio_macros
tokio_openssl
tokio_timer
tokio_tls
tokio_util
toml
tower_service
tracing
tracing_core
try_lock
twoway
twox_hash
txn_types
typenum
ucd_trie
unchecked_index
unicase
unicode_bidi
unicode_normalization
unicode_segmentation
unicode_width
unicode_xid
untrusted
url
utf8parse
uuid
vec_map
vlog
walkdir
want
xml
yatp
zeroize
zstd_sys
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
//! A memory-safer wrapper around system dynamic library loading primitives.
//!
//! Using this library allows loading [dynamic libraries](struct.Library.html) (also known as
//! shared libraries) and use functions & global variables contained within the libraries.
//!
//! `libloading` crate exposes a cross-platform interface to load a library and utilize its
//! contents, but little is done to paper over the differences in behaviour between different
//! platforms. The API documentation strives to document such differences on the best-effort basis.
//!
//! Platform specific APIs are also available in the [`os`](crate::os) module. These APIs are more
//! flexible but less safe.
//!
//! # Usage
//!
//! Add a dependency on this library to your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! libloading = "0.7"
//! ```
//!
//! Then inside your code:
//!
//! ```no_run
//! fn call_dynamic() -> Result<u32, Box<dyn std::error::Error>> {
//!     unsafe {
//!         let lib = libloading::Library::new("/path/to/liblibrary.so")?;
//!         let func: libloading::Symbol<unsafe extern fn() -> u32> = lib.get(b"my_func")?;
//!         Ok(func())
//!     }
//! }
//! ```
//!
//! The compiler will ensure that the loaded `function` will not outlive the `Library` it comes
//! from, preventing a common class of issues.
#![deny(
    missing_docs,
    clippy::all,
    unreachable_pub,
    unused,
)]
#![cfg_attr(docsrs, deny(broken_intra_doc_links))]
#![cfg_attr(docsrs, feature(doc_cfg))]

use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
use std::ffi::{OsStr, OsString};
use std::fmt;
use std::ops;
use std::marker;

#[cfg(unix)]
use self::os::unix as imp;
#[cfg(windows)]
use self::os::windows as imp;
pub use self::error::Error;

pub mod os;
pub mod changelog;
mod util;
mod error;

/// A loaded dynamic library.
pub struct Library(imp::Library);

impl Library {
    /// Find and load a dynamic library.
    ///
    /// The `filename` argument may be any of:
    ///
    /// * A library filename;
    /// * Absolute path to the library;
    /// * Relative (to the current working directory) path to the library.
    ///
    /// # Safety
    ///
    /// When a library is loaded initialization routines contained within the library are executed.
    /// For the purposes of safety, execution of these routines is conceptually the same calling an
    /// unknown foreign function and may impose arbitrary requirements on the caller for the call
    /// to be sound.
    ///
    /// Additionally, the callers of this function must also ensure that execution of the
    /// termination routines contained within the library is safe as well. These routines may be
    /// executed when the library is unloaded.
    ///
    /// # Thread-safety
    ///
    /// The implementation strives to be as MT-safe as sanely possible, however on certain
    /// platforms the underlying error-handling related APIs not always MT-safe. This library
    /// shares these limitations on those platforms. In particular, on certain UNIX targets
    /// `dlerror` is not MT-safe, resulting in garbage error messages in certain MT-scenarios.
    ///
    /// Calling this function from multiple threads is not MT-safe if used in conjunction with
    /// library filenames and the library search path is modified (`SetDllDirectory` function on
    /// Windows, `{DY,}LD_LIBRARY_PATH` environment variable on UNIX).
    ///
    /// # Platform-specific behaviour
    ///
    /// When a plain library filename is supplied, locations where library is searched for is
    /// platform specific and cannot be adjusted in a portable manner. See documentation for
    /// the platform specific [`os::unix::Library::new`] and [`os::windows::Library::new`] methods
    /// for further information on library lookup behaviour.
    ///
    /// If the `filename` specifies a library filename without path and with extension omitted,
    /// `.dll` extension is implicitly added on Windows.
    ///
    /// # Tips
    ///
    /// Distributing your dynamic libraries under a filename common to all platforms (e.g.
    /// `awesome.module`) allows to avoid code which has to account for platform’s conventional
    /// library filenames.
    ///
    /// Strive to specify an absolute or at least a relative path to your library, unless
    /// system-wide libraries are being loaded. Platform-dependent library search locations
    /// combined with various quirks related to path-less filenames may cause flakiness in
    /// programs.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use ::libloading::Library;
    /// // Any of the following are valid.
    /// unsafe {
    ///     let _ = Library::new("/path/to/awesome.module").unwrap();
    ///     let _ = Library::new("../awesome.module").unwrap();
    ///     let _ = Library::new("libsomelib.so.1").unwrap();
    /// }
    /// ```
    pub unsafe fn new<P: AsRef<OsStr>>(filename: P) -> Result<Library, Error> {
        imp::Library::new(filename).map(From::from)
    }

    /// Get a pointer to function or static variable by symbol name.
    ///
    /// The `symbol` may not contain any null bytes, with an exception of last byte. Providing a
    /// null terminated `symbol` may help to avoid an allocation.
    ///
    /// Symbol is interpreted as-is; no mangling is done. This means that symbols like `x::y` are
    /// most likely invalid.
    ///
    /// # Safety
    ///
    /// Users of this API must specify the correct type of the function or variable loaded. Using a
    /// `Symbol` with a wrong type is undefined.
    ///
    /// # Platform-specific behaviour
    ///
    /// Implementation of thread local variables is extremely platform specific and uses of such
    /// variables that work on e.g. Linux may have unintended behaviour on other targets.
    ///
    /// On POSIX implementations where the `dlerror` function is not confirmed to be MT-safe (such
    /// as FreeBSD), this function will unconditionally return an error when the underlying `dlsym`
    /// call returns a null pointer. There are rare situations where `dlsym` returns a genuine null
    /// pointer without it being an error. If loading a null pointer is something you care about,
    /// consider using the [`os::unix::Library::get_singlethreaded`] call.
    ///
    /// # Examples
    ///
    /// Given a loaded library:
    ///
    /// ```no_run
    /// # use ::libloading::Library;
    /// let lib = unsafe {
    ///     Library::new("/path/to/awesome.module").unwrap()
    /// };
    /// ```
    ///
    /// Loading and using a function looks like this:
    ///
    /// ```no_run
    /// # use ::libloading::{Library, Symbol};
    /// # let lib = unsafe {
    /// #     Library::new("/path/to/awesome.module").unwrap()
    /// # };
    /// unsafe {
    ///     let awesome_function: Symbol<unsafe extern fn(f64) -> f64> =
    ///         lib.get(b"awesome_function\0").unwrap();
    ///     awesome_function(0.42);
    /// }
    /// ```
    ///
    /// A static variable may also be loaded and inspected:
    ///
    /// ```no_run
    /// # use ::libloading::{Library, Symbol};
    /// # let lib = unsafe { Library::new("/path/to/awesome.module").unwrap() };
    /// unsafe {
    ///     let awesome_variable: Symbol<*mut f64> = lib.get(b"awesome_variable\0").unwrap();
    ///     **awesome_variable = 42.0;
    /// };
    /// ```
    pub unsafe fn get<'lib, T>(&'lib self, symbol: &[u8]) -> Result<Symbol<'lib, T>, Error> {
        self.0.get(symbol).map(|from| Symbol::from_raw(from, self))
    }

    /// Unload the library.
    ///
    /// This method might be a no-op, depending on the flags with which the `Library` was opened,
    /// what library was opened or other platform specifics.
    ///
    /// You only need to call this if you are interested in handling any errors that may arise when
    /// library is unloaded. Otherwise the implementation of `Drop` for `Library` will close the
    /// library and ignore the errors were they arise.
    ///
    /// The underlying data structures may still get leaked if an error does occur.
    pub fn close(self) -> Result<(), Error> {
        self.0.close()
    }
}

impl fmt::Debug for Library {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(f)
    }
}

impl From<imp::Library> for Library {
    fn from(lib: imp::Library) -> Library {
        Library(lib)
    }
}

impl From<Library> for imp::Library {
    fn from(lib: Library) -> imp::Library {
        lib.0
    }
}

unsafe impl Send for Library {}
unsafe impl Sync for Library {}

/// Symbol from a library.
///
/// This type is a safeguard against using dynamically loaded symbols after a `Library` is
/// unloaded. Primary method to create an instance of a `Symbol` is via [`Library::get`].
///
/// The `Deref` trait implementation allows use of `Symbol` as if it was a function or variable
/// itself, without taking care to “extract” function or variable manually most of the time.
///
/// [`Library::get`]: Library::get
pub struct Symbol<'lib, T: 'lib> {
    inner: imp::Symbol<T>,
    pd: marker::PhantomData<&'lib T>
}

impl<'lib, T> Symbol<'lib, T> {
    /// Extract the wrapped `os::platform::Symbol`.
    ///
    /// # Safety
    ///
    /// Using this function relinquishes all the lifetime guarantees. It is up to programmer to
    /// ensure the resulting `Symbol` is not used past the lifetime of the `Library` this symbol
    /// was loaded from.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use ::libloading::{Library, Symbol};
    /// unsafe {
    ///     let lib = Library::new("/path/to/awesome.module").unwrap();
    ///     let symbol: Symbol<*mut u32> = lib.get(b"symbol\0").unwrap();
    ///     let symbol = symbol.into_raw();
    /// }
    /// ```
    pub unsafe fn into_raw(self) -> imp::Symbol<T> {
        self.inner
    }

    /// Wrap the `os::platform::Symbol` into this safe wrapper.
    ///
    /// Note that, in order to create association between the symbol and the library this symbol
    /// came from, this function requires a reference to the library.
    ///
    /// # Safety
    ///
    /// The `library` reference must be exactly the library `sym` was loaded from.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use ::libloading::{Library, Symbol};
    /// unsafe {
    ///     let lib = Library::new("/path/to/awesome.module").unwrap();
    ///     let symbol: Symbol<*mut u32> = lib.get(b"symbol\0").unwrap();
    ///     let symbol = symbol.into_raw();
    ///     let symbol = Symbol::from_raw(symbol, &lib);
    /// }
    /// ```
    pub unsafe fn from_raw<L>(sym: imp::Symbol<T>, library: &'lib L) -> Symbol<'lib, T> {
        let _ = library; // ignore here for documentation purposes.
        Symbol {
            inner: sym,
            pd: marker::PhantomData
        }
    }
}

impl<'lib, T> Symbol<'lib, Option<T>> {
    /// Lift Option out of the symbol.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use ::libloading::{Library, Symbol};
    /// unsafe {
    ///     let lib = Library::new("/path/to/awesome.module").unwrap();
    ///     let symbol: Symbol<Option<*mut u32>> = lib.get(b"symbol\0").unwrap();
    ///     let symbol: Symbol<*mut u32> = symbol.lift_option().expect("static is not null");
    /// }
    /// ```
    pub fn lift_option(self) -> Option<Symbol<'lib, T>> {
        self.inner.lift_option().map(|is| Symbol {
            inner: is,
            pd: marker::PhantomData,
        })
    }
}

impl<'lib, T> Clone for Symbol<'lib, T> {
    fn clone(&self) -> Symbol<'lib, T> {
        Symbol {
            inner: self.inner.clone(),
            pd: marker::PhantomData
        }
    }
}

// FIXME: implement FnOnce for callable stuff instead.
impl<'lib, T> ops::Deref for Symbol<'lib, T> {
    type Target = T;
    fn deref(&self) -> &T {
        ops::Deref::deref(&self.inner)
    }
}

impl<'lib, T> fmt::Debug for Symbol<'lib, T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.inner.fmt(f)
    }
}

unsafe impl<'lib, T: Send> Send for Symbol<'lib, T> {}
unsafe impl<'lib, T: Sync> Sync for Symbol<'lib, T> {}

/// Converts a library name to a filename generally appropriate for use on the system.
///
/// The function will prepend prefixes (such as `lib`) and suffixes (such as `.so`) to the library
/// `name` to construct the filename.
///
/// # Examples
///
/// It can be used to load global libraries in a platform independent manner:
///
/// ```
/// use libloading::{Library, library_filename};
/// // Will attempt to load `libLLVM.so` on Linux, `libLLVM.dylib` on macOS and `LLVM.dll` on
/// // Windows.
/// let library = unsafe {
///     Library::new(library_filename("LLVM"))
/// };
/// ```
pub fn library_filename<S: AsRef<OsStr>>(name: S) -> OsString {
    let name = name.as_ref();
    let mut string = OsString::with_capacity(name.len() + DLL_PREFIX.len() + DLL_SUFFIX.len());
    string.push(DLL_PREFIX);
    string.push(name);
    string.push(DLL_SUFFIX);
    string
}