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wepoll.c
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/*
* wepoll - epoll for Windows
* https://github.com/piscisaureus/wepoll
*
* Copyright 2012-2020, Bert Belder <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define WEPOLL_EXPORT
#ifndef _WIN32_WINNT
/* Minimum required for SetFileCompletionNotificationModes() */
#define _WIN32_WINNT 0x0600
#endif
#define WIN32_LEAN_AND_MEAN
#include <stdint.h>
#include "event-internal.h"
enum EPOLL_EVENTS {
EPOLLIN = (int) (1U << 0),
EPOLLPRI = (int) (1U << 1),
EPOLLOUT = (int) (1U << 2),
EPOLLERR = (int) (1U << 3),
EPOLLHUP = (int) (1U << 4),
EPOLLRDNORM = (int) (1U << 6),
EPOLLRDBAND = (int) (1U << 7),
EPOLLWRNORM = (int) (1U << 8),
EPOLLWRBAND = (int) (1U << 9),
EPOLLMSG = (int) (1U << 10), /* Never reported. */
EPOLLRDHUP = (int) (1U << 13),
EPOLLONESHOT = (int) (1U << 31)
};
#define EPOLLIN (1U << 0)
#define EPOLLPRI (1U << 1)
#define EPOLLOUT (1U << 2)
#define EPOLLERR (1U << 3)
#define EPOLLHUP (1U << 4)
#define EPOLLRDNORM (1U << 6)
#define EPOLLRDBAND (1U << 7)
#define EPOLLWRNORM (1U << 8)
#define EPOLLWRBAND (1U << 9)
#define EPOLLMSG (1U << 10)
#define EPOLLRDHUP (1U << 13)
#define EPOLLONESHOT (1U << 31)
#define EPOLL_CTL_ADD 1
#define EPOLL_CTL_MOD 2
#define EPOLL_CTL_DEL 3
typedef void* HANDLE;
typedef uintptr_t SOCKET;
typedef union epoll_data {
void* ptr;
int fd;
uint32_t u32;
uint64_t u64;
SOCKET sock; /* Windows specific */
HANDLE hnd; /* Windows specific */
} epoll_data_t;
struct epoll_event {
uint32_t events; /* Epoll events and flags */
epoll_data_t data; /* User data variable */
};
#ifdef __cplusplus
extern "C" {
#endif
WEPOLL_EXPORT HANDLE epoll_create(int size);
WEPOLL_EXPORT HANDLE epoll_create1(int flags);
WEPOLL_EXPORT int epoll_close(HANDLE ephnd);
WEPOLL_EXPORT int epoll_ctl(HANDLE ephnd,
int op,
SOCKET sock,
struct epoll_event* event);
WEPOLL_EXPORT int epoll_wait(HANDLE ephnd,
struct epoll_event* events,
int maxevents,
int timeout);
#ifdef __cplusplus
} /* extern "C" */
#endif
#include <assert.h>
#include <stdlib.h>
#define WEPOLL_INTERNAL static
#define WEPOLL_INTERNAL_VAR static
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wreserved-id-macro"
#endif
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#ifndef __GNUC__
#pragma warning(push, 1)
#endif
#include <ws2tcpip.h>
#include <winsock2.h>
#include <windows.h>
#ifndef __GNUC__
#pragma warning(pop)
#endif
WEPOLL_INTERNAL int nt_global_init(void);
typedef LONG NTSTATUS;
typedef NTSTATUS* PNTSTATUS;
#ifndef NT_SUCCESS
#define NT_SUCCESS(status) (((NTSTATUS)(status)) >= 0)
#endif
#ifndef STATUS_SUCCESS
#define STATUS_SUCCESS ((NTSTATUS) 0x00000000L)
#endif
#ifndef STATUS_PENDING
#define STATUS_PENDING ((NTSTATUS) 0x00000103L)
#endif
#ifndef STATUS_CANCELLED
#define STATUS_CANCELLED ((NTSTATUS) 0xC0000120L)
#endif
#ifndef STATUS_NOT_FOUND
#define STATUS_NOT_FOUND ((NTSTATUS) 0xC0000225L)
#endif
typedef struct _IO_STATUS_BLOCK {
NTSTATUS Status;
ULONG_PTR Information;
} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
typedef VOID(NTAPI* PIO_APC_ROUTINE)(PVOID ApcContext,
PIO_STATUS_BLOCK IoStatusBlock,
ULONG Reserved);
typedef struct _UNICODE_STRING {
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;
#define RTL_CONSTANT_STRING(s) \
{ sizeof(s) - sizeof((s)[0]), sizeof(s), s }
typedef struct _OBJECT_ATTRIBUTES {
ULONG Length;
HANDLE RootDirectory;
PUNICODE_STRING ObjectName;
ULONG Attributes;
PVOID SecurityDescriptor;
PVOID SecurityQualityOfService;
} OBJECT_ATTRIBUTES, *POBJECT_ATTRIBUTES;
#define RTL_CONSTANT_OBJECT_ATTRIBUTES(ObjectName, Attributes) \
{ sizeof(OBJECT_ATTRIBUTES), NULL, ObjectName, Attributes, NULL, NULL }
#ifndef FILE_OPEN
#define FILE_OPEN 0x00000001UL
#endif
#define KEYEDEVENT_WAIT 0x00000001UL
#define KEYEDEVENT_WAKE 0x00000002UL
#define KEYEDEVENT_ALL_ACCESS \
(STANDARD_RIGHTS_REQUIRED | KEYEDEVENT_WAIT | KEYEDEVENT_WAKE)
#define NT_NTDLL_IMPORT_LIST(X) \
X(NTSTATUS, \
NTAPI, \
NtCancelIoFileEx, \
(HANDLE FileHandle, \
PIO_STATUS_BLOCK IoRequestToCancel, \
PIO_STATUS_BLOCK IoStatusBlock)) \
\
X(NTSTATUS, \
NTAPI, \
NtCreateFile, \
(PHANDLE FileHandle, \
ACCESS_MASK DesiredAccess, \
POBJECT_ATTRIBUTES ObjectAttributes, \
PIO_STATUS_BLOCK IoStatusBlock, \
PLARGE_INTEGER AllocationSize, \
ULONG FileAttributes, \
ULONG ShareAccess, \
ULONG CreateDisposition, \
ULONG CreateOptions, \
PVOID EaBuffer, \
ULONG EaLength)) \
\
X(NTSTATUS, \
NTAPI, \
NtCreateKeyedEvent, \
(PHANDLE KeyedEventHandle, \
ACCESS_MASK DesiredAccess, \
POBJECT_ATTRIBUTES ObjectAttributes, \
ULONG Flags)) \
\
X(NTSTATUS, \
NTAPI, \
NtDeviceIoControlFile, \
(HANDLE FileHandle, \
HANDLE Event, \
PIO_APC_ROUTINE ApcRoutine, \
PVOID ApcContext, \
PIO_STATUS_BLOCK IoStatusBlock, \
ULONG IoControlCode, \
PVOID InputBuffer, \
ULONG InputBufferLength, \
PVOID OutputBuffer, \
ULONG OutputBufferLength)) \
\
X(NTSTATUS, \
NTAPI, \
NtReleaseKeyedEvent, \
(HANDLE KeyedEventHandle, \
PVOID KeyValue, \
BOOLEAN Alertable, \
PLARGE_INTEGER Timeout)) \
\
X(NTSTATUS, \
NTAPI, \
NtWaitForKeyedEvent, \
(HANDLE KeyedEventHandle, \
PVOID KeyValue, \
BOOLEAN Alertable, \
PLARGE_INTEGER Timeout)) \
\
X(ULONG, WINAPI, RtlNtStatusToDosError, (NTSTATUS Status))
#define X(return_type, attributes, name, parameters) \
WEPOLL_INTERNAL_VAR return_type(attributes* name) parameters;
NT_NTDLL_IMPORT_LIST(X)
#undef X
#define AFD_POLL_RECEIVE 0x0001
#define AFD_POLL_RECEIVE_EXPEDITED 0x0002
#define AFD_POLL_SEND 0x0004
#define AFD_POLL_DISCONNECT 0x0008
#define AFD_POLL_ABORT 0x0010
#define AFD_POLL_LOCAL_CLOSE 0x0020
#define AFD_POLL_ACCEPT 0x0080
#define AFD_POLL_CONNECT_FAIL 0x0100
typedef struct _AFD_POLL_HANDLE_INFO {
HANDLE Handle;
ULONG Events;
NTSTATUS Status;
} AFD_POLL_HANDLE_INFO, *PAFD_POLL_HANDLE_INFO;
typedef struct _AFD_POLL_INFO {
LARGE_INTEGER Timeout;
ULONG NumberOfHandles;
ULONG Exclusive;
AFD_POLL_HANDLE_INFO Handles[1];
} AFD_POLL_INFO, *PAFD_POLL_INFO;
WEPOLL_INTERNAL int afd_create_helper_handle(HANDLE iocp_handle,
HANDLE* afd_helper_handle_out);
WEPOLL_INTERNAL int afd_poll(HANDLE afd_helper_handle,
AFD_POLL_INFO* poll_info,
IO_STATUS_BLOCK* io_status_block);
WEPOLL_INTERNAL int afd_cancel_poll(HANDLE afd_helper_handle,
IO_STATUS_BLOCK* io_status_block);
#define return_map_error(value) \
do { \
err_map_win_error(); \
return (value); \
} while (0)
#define return_set_error(value, error) \
do { \
err_set_win_error(error); \
return (value); \
} while (0)
WEPOLL_INTERNAL void err_map_win_error(void);
WEPOLL_INTERNAL void err_set_win_error(DWORD error);
WEPOLL_INTERNAL int err_check_handle(HANDLE handle);
#define IOCTL_AFD_POLL 0x00012024
static UNICODE_STRING afd__helper_name =
RTL_CONSTANT_STRING(L"\\Device\\Afd\\Wepoll");
static OBJECT_ATTRIBUTES afd__helper_attributes =
RTL_CONSTANT_OBJECT_ATTRIBUTES(&afd__helper_name, 0);
int afd_create_helper_handle(HANDLE iocp_handle,
HANDLE* afd_helper_handle_out) {
HANDLE afd_helper_handle;
IO_STATUS_BLOCK iosb;
NTSTATUS status;
/* By opening \Device\Afd without specifying any extended attributes, we'll
* get a handle that lets us talk to the AFD driver, but that doesn't have an
* associated endpoint (so it's not a socket). */
status = NtCreateFile(&afd_helper_handle,
SYNCHRONIZE,
&afd__helper_attributes,
&iosb,
NULL,
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
0,
NULL,
0);
if (status != STATUS_SUCCESS)
return_set_error(-1, RtlNtStatusToDosError(status));
if (CreateIoCompletionPort(afd_helper_handle, iocp_handle, 0, 0) == NULL)
goto error;
if (!SetFileCompletionNotificationModes(afd_helper_handle,
FILE_SKIP_SET_EVENT_ON_HANDLE))
goto error;
*afd_helper_handle_out = afd_helper_handle;
return 0;
error:
CloseHandle(afd_helper_handle);
return_map_error(-1);
}
int afd_poll(HANDLE afd_helper_handle,
AFD_POLL_INFO* poll_info,
IO_STATUS_BLOCK* io_status_block) {
NTSTATUS status;
/* Blocking operation is not supported. */
assert(io_status_block != NULL);
io_status_block->Status = STATUS_PENDING;
status = NtDeviceIoControlFile(afd_helper_handle,
NULL,
NULL,
io_status_block,
io_status_block,
IOCTL_AFD_POLL,
poll_info,
sizeof *poll_info,
poll_info,
sizeof *poll_info);
if (status == STATUS_SUCCESS)
return 0;
else if (status == STATUS_PENDING)
return_set_error(-1, ERROR_IO_PENDING);
else
return_set_error(-1, RtlNtStatusToDosError(status));
}
int afd_cancel_poll(HANDLE afd_helper_handle,
IO_STATUS_BLOCK* io_status_block) {
NTSTATUS cancel_status;
IO_STATUS_BLOCK cancel_iosb;
/* If the poll operation has already completed or has been cancelled earlier,
* there's nothing left for us to do. */
if (io_status_block->Status != STATUS_PENDING)
return 0;
cancel_status =
NtCancelIoFileEx(afd_helper_handle, io_status_block, &cancel_iosb);
/* NtCancelIoFileEx() may return STATUS_NOT_FOUND if the operation completed
* just before calling NtCancelIoFileEx(). This is not an error. */
if (cancel_status == STATUS_SUCCESS || cancel_status == STATUS_NOT_FOUND)
return 0;
else
return_set_error(-1, RtlNtStatusToDosError(cancel_status));
}
WEPOLL_INTERNAL int epoll_global_init(void);
WEPOLL_INTERNAL int init(void);
typedef struct port_state port_state_t;
typedef struct queue queue_t;
typedef struct sock_state sock_state_t;
typedef struct ts_tree_node ts_tree_node_t;
WEPOLL_INTERNAL port_state_t* port_new(HANDLE* iocp_handle_out);
WEPOLL_INTERNAL int port_close(port_state_t* port_state);
WEPOLL_INTERNAL int port_delete(port_state_t* port_state);
WEPOLL_INTERNAL int port_wait(port_state_t* port_state,
struct epoll_event* events,
int maxevents,
int timeout);
WEPOLL_INTERNAL int port_ctl(port_state_t* port_state,
int op,
SOCKET sock,
struct epoll_event* ev);
WEPOLL_INTERNAL int port_register_socket_handle(port_state_t* port_state,
sock_state_t* sock_state,
SOCKET socket);
WEPOLL_INTERNAL void port_unregister_socket_handle(port_state_t* port_state,
sock_state_t* sock_state);
WEPOLL_INTERNAL sock_state_t* port_find_socket(port_state_t* port_state,
SOCKET socket);
WEPOLL_INTERNAL void port_request_socket_update(port_state_t* port_state,
sock_state_t* sock_state);
WEPOLL_INTERNAL void port_cancel_socket_update(port_state_t* port_state,
sock_state_t* sock_state);
WEPOLL_INTERNAL void port_add_deleted_socket(port_state_t* port_state,
sock_state_t* sock_state);
WEPOLL_INTERNAL void port_remove_deleted_socket(port_state_t* port_state,
sock_state_t* sock_state);
WEPOLL_INTERNAL HANDLE port_get_iocp_handle(port_state_t* port_state);
WEPOLL_INTERNAL queue_t* port_get_poll_group_queue(port_state_t* port_state);
WEPOLL_INTERNAL port_state_t* port_state_from_handle_tree_node(
ts_tree_node_t* tree_node);
WEPOLL_INTERNAL ts_tree_node_t* port_state_to_handle_tree_node(
port_state_t* port_state);
/* The reflock is a special kind of lock that normally prevents a chunk of
* memory from being freed, but does allow the chunk of memory to eventually be
* released in a coordinated fashion.
*
* Under normal operation, threads increase and decrease the reference count,
* which are wait-free operations.
*
* Exactly once during the reflock's lifecycle, a thread holding a reference to
* the lock may "destroy" the lock; this operation blocks until all other
* threads holding a reference to the lock have dereferenced it. After
* "destroy" returns, the calling thread may assume that no other threads have
* a reference to the lock.
*
* Attempting to lock or destroy a lock after reflock_unref_and_destroy() has
* been called is invalid and results in undefined behavior. Therefore the user
* should use another lock to guarantee that this can't happen.
*/
typedef struct reflock {
volatile long state; /* 32-bit Interlocked APIs operate on `long` values. */
} reflock_t;
WEPOLL_INTERNAL int reflock_global_init(void);
WEPOLL_INTERNAL void reflock_init(reflock_t* reflock);
WEPOLL_INTERNAL void reflock_ref(reflock_t* reflock);
WEPOLL_INTERNAL void reflock_unref(reflock_t* reflock);
WEPOLL_INTERNAL void reflock_unref_and_destroy(reflock_t* reflock);
#include <stdbool.h>
/* N.b.: the tree functions do not set errno or LastError when they fail. Each
* of the API functions has at most one failure mode. It is up to the caller to
* set an appropriate error code when necessary. */
typedef struct tree tree_t;
typedef struct tree_node tree_node_t;
typedef struct tree {
tree_node_t* root;
} tree_t;
typedef struct tree_node {
tree_node_t* left;
tree_node_t* right;
tree_node_t* parent;
uintptr_t key;
bool red;
} tree_node_t;
WEPOLL_INTERNAL void tree_init(tree_t* tree);
WEPOLL_INTERNAL void tree_node_init(tree_node_t* node);
WEPOLL_INTERNAL int tree_add(tree_t* tree, tree_node_t* node, uintptr_t key);
WEPOLL_INTERNAL void tree_del(tree_t* tree, tree_node_t* node);
WEPOLL_INTERNAL tree_node_t* tree_find(const tree_t* tree, uintptr_t key);
WEPOLL_INTERNAL tree_node_t* tree_root(const tree_t* tree);
typedef struct ts_tree {
tree_t tree;
SRWLOCK lock;
} ts_tree_t;
typedef struct ts_tree_node {
tree_node_t tree_node;
reflock_t reflock;
} ts_tree_node_t;
WEPOLL_INTERNAL void ts_tree_init(ts_tree_t* rtl);
WEPOLL_INTERNAL void ts_tree_node_init(ts_tree_node_t* node);
WEPOLL_INTERNAL int ts_tree_add(ts_tree_t* ts_tree,
ts_tree_node_t* node,
uintptr_t key);
WEPOLL_INTERNAL ts_tree_node_t* ts_tree_del_and_ref(ts_tree_t* ts_tree,
uintptr_t key);
WEPOLL_INTERNAL ts_tree_node_t* ts_tree_find_and_ref(ts_tree_t* ts_tree,
uintptr_t key);
WEPOLL_INTERNAL void ts_tree_node_unref(ts_tree_node_t* node);
WEPOLL_INTERNAL void ts_tree_node_unref_and_destroy(ts_tree_node_t* node);
static ts_tree_t epoll__handle_tree;
int epoll_global_init(void) {
ts_tree_init(&epoll__handle_tree);
return 0;
}
static HANDLE epoll__create(void) {
port_state_t* port_state;
HANDLE ephnd;
ts_tree_node_t* tree_node;
if (init() < 0)
return NULL;
port_state = port_new(&ephnd);
if (port_state == NULL)
return NULL;
tree_node = port_state_to_handle_tree_node(port_state);
if (ts_tree_add(&epoll__handle_tree, tree_node, (uintptr_t) ephnd) < 0) {
/* This should never happen. */
port_delete(port_state);
return_set_error(NULL, ERROR_ALREADY_EXISTS);
}
return ephnd;
}
HANDLE epoll_create(int size) {
if (size <= 0)
return_set_error(NULL, ERROR_INVALID_PARAMETER);
return epoll__create();
}
HANDLE epoll_create1(int flags) {
if (flags != 0)
return_set_error(NULL, ERROR_INVALID_PARAMETER);
return epoll__create();
}
int epoll_close(HANDLE ephnd) {
ts_tree_node_t* tree_node;
port_state_t* port_state;
if (init() < 0)
return -1;
tree_node = ts_tree_del_and_ref(&epoll__handle_tree, (uintptr_t) ephnd);
if (tree_node == NULL) {
err_set_win_error(ERROR_INVALID_PARAMETER);
goto err;
}
port_state = port_state_from_handle_tree_node(tree_node);
port_close(port_state);
ts_tree_node_unref_and_destroy(tree_node);
return port_delete(port_state);
err:
err_check_handle(ephnd);
return -1;
}
int epoll_ctl(HANDLE ephnd, int op, SOCKET sock, struct epoll_event* ev) {
ts_tree_node_t* tree_node;
port_state_t* port_state;
int r;
if (init() < 0)
return -1;
tree_node = ts_tree_find_and_ref(&epoll__handle_tree, (uintptr_t) ephnd);
if (tree_node == NULL) {
err_set_win_error(ERROR_INVALID_PARAMETER);
goto err;
}
port_state = port_state_from_handle_tree_node(tree_node);
r = port_ctl(port_state, op, sock, ev);
ts_tree_node_unref(tree_node);
if (r < 0)
goto err;
return 0;
err:
/* On Linux, in the case of epoll_ctl(), EBADF takes priority over other
* errors. Wepoll mimics this behavior. */
err_check_handle(ephnd);
err_check_handle((HANDLE) sock);
return -1;
}
int epoll_wait(HANDLE ephnd,
struct epoll_event* events,
int maxevents,
int timeout) {
ts_tree_node_t* tree_node;
port_state_t* port_state;
int num_events;
if (maxevents <= 0)
return_set_error(-1, ERROR_INVALID_PARAMETER);
if (init() < 0)
return -1;
tree_node = ts_tree_find_and_ref(&epoll__handle_tree, (uintptr_t) ephnd);
if (tree_node == NULL) {
err_set_win_error(ERROR_INVALID_PARAMETER);
goto err;
}
port_state = port_state_from_handle_tree_node(tree_node);
num_events = port_wait(port_state, events, maxevents, timeout);
ts_tree_node_unref(tree_node);
if (num_events < 0)
goto err;
return num_events;
err:
err_check_handle(ephnd);
return -1;
}
#include <errno.h>
#define ERR__ERRNO_MAPPINGS(X) \
X(ERROR_ACCESS_DENIED, EACCES) \
X(ERROR_ALREADY_EXISTS, EEXIST) \
X(ERROR_BAD_COMMAND, EACCES) \
X(ERROR_BAD_EXE_FORMAT, ENOEXEC) \
X(ERROR_BAD_LENGTH, EACCES) \
X(ERROR_BAD_NETPATH, ENOENT) \
X(ERROR_BAD_NET_NAME, ENOENT) \
X(ERROR_BAD_NET_RESP, ENETDOWN) \
X(ERROR_BAD_PATHNAME, ENOENT) \
X(ERROR_BROKEN_PIPE, EPIPE) \
X(ERROR_CANNOT_MAKE, EACCES) \
X(ERROR_COMMITMENT_LIMIT, ENOMEM) \
X(ERROR_CONNECTION_ABORTED, ECONNABORTED) \
X(ERROR_CONNECTION_ACTIVE, EISCONN) \
X(ERROR_CONNECTION_REFUSED, ECONNREFUSED) \
X(ERROR_CRC, EACCES) \
X(ERROR_DIR_NOT_EMPTY, ENOTEMPTY) \
X(ERROR_DISK_FULL, ENOSPC) \
X(ERROR_DUP_NAME, EADDRINUSE) \
X(ERROR_FILENAME_EXCED_RANGE, ENOENT) \
X(ERROR_FILE_NOT_FOUND, ENOENT) \
X(ERROR_GEN_FAILURE, EACCES) \
X(ERROR_GRACEFUL_DISCONNECT, EPIPE) \
X(ERROR_HOST_DOWN, EHOSTUNREACH) \
X(ERROR_HOST_UNREACHABLE, EHOSTUNREACH) \
X(ERROR_INSUFFICIENT_BUFFER, EFAULT) \
X(ERROR_INVALID_ADDRESS, EADDRNOTAVAIL) \
X(ERROR_INVALID_FUNCTION, EINVAL) \
X(ERROR_INVALID_HANDLE, EBADF) \
X(ERROR_INVALID_NETNAME, EADDRNOTAVAIL) \
X(ERROR_INVALID_PARAMETER, EINVAL) \
X(ERROR_INVALID_USER_BUFFER, EMSGSIZE) \
X(ERROR_IO_PENDING, EINPROGRESS) \
X(ERROR_LOCK_VIOLATION, EACCES) \
X(ERROR_MORE_DATA, EMSGSIZE) \
X(ERROR_NETNAME_DELETED, ECONNABORTED) \
X(ERROR_NETWORK_ACCESS_DENIED, EACCES) \
X(ERROR_NETWORK_BUSY, ENETDOWN) \
X(ERROR_NETWORK_UNREACHABLE, ENETUNREACH) \
X(ERROR_NOACCESS, EFAULT) \
X(ERROR_NONPAGED_SYSTEM_RESOURCES, ENOMEM) \
X(ERROR_NOT_ENOUGH_MEMORY, ENOMEM) \
X(ERROR_NOT_ENOUGH_QUOTA, ENOMEM) \
X(ERROR_NOT_FOUND, ENOENT) \
X(ERROR_NOT_LOCKED, EACCES) \
X(ERROR_NOT_READY, EACCES) \
X(ERROR_NOT_SAME_DEVICE, EXDEV) \
X(ERROR_NOT_SUPPORTED, ENOTSUP) \
X(ERROR_NO_MORE_FILES, ENOENT) \
X(ERROR_NO_SYSTEM_RESOURCES, ENOMEM) \
X(ERROR_OPERATION_ABORTED, EINTR) \
X(ERROR_OUT_OF_PAPER, EACCES) \
X(ERROR_PAGED_SYSTEM_RESOURCES, ENOMEM) \
X(ERROR_PAGEFILE_QUOTA, ENOMEM) \
X(ERROR_PATH_NOT_FOUND, ENOENT) \
X(ERROR_PIPE_NOT_CONNECTED, EPIPE) \
X(ERROR_PORT_UNREACHABLE, ECONNRESET) \
X(ERROR_PROTOCOL_UNREACHABLE, ENETUNREACH) \
X(ERROR_REM_NOT_LIST, ECONNREFUSED) \
X(ERROR_REQUEST_ABORTED, EINTR) \
X(ERROR_REQ_NOT_ACCEP, EWOULDBLOCK) \
X(ERROR_SECTOR_NOT_FOUND, EACCES) \
X(ERROR_SEM_TIMEOUT, ETIMEDOUT) \
X(ERROR_SHARING_VIOLATION, EACCES) \
X(ERROR_TOO_MANY_NAMES, ENOMEM) \
X(ERROR_TOO_MANY_OPEN_FILES, EMFILE) \
X(ERROR_UNEXP_NET_ERR, ECONNABORTED) \
X(ERROR_WAIT_NO_CHILDREN, ECHILD) \
X(ERROR_WORKING_SET_QUOTA, ENOMEM) \
X(ERROR_WRITE_PROTECT, EACCES) \
X(ERROR_WRONG_DISK, EACCES) \
X(WSAEACCES, EACCES) \
X(WSAEADDRINUSE, EADDRINUSE) \
X(WSAEADDRNOTAVAIL, EADDRNOTAVAIL) \
X(WSAEAFNOSUPPORT, EAFNOSUPPORT) \
X(WSAECONNABORTED, ECONNABORTED) \
X(WSAECONNREFUSED, ECONNREFUSED) \
X(WSAECONNRESET, ECONNRESET) \
X(WSAEDISCON, EPIPE) \
X(WSAEFAULT, EFAULT) \
X(WSAEHOSTDOWN, EHOSTUNREACH) \
X(WSAEHOSTUNREACH, EHOSTUNREACH) \
X(WSAEINPROGRESS, EBUSY) \
X(WSAEINTR, EINTR) \
X(WSAEINVAL, EINVAL) \
X(WSAEISCONN, EISCONN) \
X(WSAEMSGSIZE, EMSGSIZE) \
X(WSAENETDOWN, ENETDOWN) \
X(WSAENETRESET, EHOSTUNREACH) \
X(WSAENETUNREACH, ENETUNREACH) \
X(WSAENOBUFS, ENOMEM) \
X(WSAENOTCONN, ENOTCONN) \
X(WSAENOTSOCK, ENOTSOCK) \
X(WSAEOPNOTSUPP, EOPNOTSUPP) \
X(WSAEPROCLIM, ENOMEM) \
X(WSAESHUTDOWN, EPIPE) \
X(WSAETIMEDOUT, ETIMEDOUT) \
X(WSAEWOULDBLOCK, EWOULDBLOCK) \
X(WSANOTINITIALISED, ENETDOWN) \
X(WSASYSNOTREADY, ENETDOWN) \
X(WSAVERNOTSUPPORTED, ENOSYS)
static errno_t err__map_win_error_to_errno(DWORD error) {
switch (error) {
#define X(error_sym, errno_sym) \
case error_sym: \
return errno_sym;
ERR__ERRNO_MAPPINGS(X)
#undef X
}
return EINVAL;
}
void err_map_win_error(void) {
errno = err__map_win_error_to_errno(GetLastError());
}
void err_set_win_error(DWORD error) {
SetLastError(error);
errno = err__map_win_error_to_errno(error);
}
int err_check_handle(HANDLE handle) {
DWORD flags;
/* GetHandleInformation() succeeds when passed INVALID_HANDLE_VALUE, so check
* for this condition explicitly. */
if (handle == INVALID_HANDLE_VALUE)
return_set_error(-1, ERROR_INVALID_HANDLE);
if (!GetHandleInformation(handle, &flags))
return_map_error(-1);
return 0;
}
#include <stddef.h>
#define array_count(a) (sizeof(a) / (sizeof((a)[0])))
#define container_of(ptr, type, member) \
((type*) ((uintptr_t) (ptr) - offsetof(type, member)))
#define unused_var(v) ((void) (v))
/* Polyfill `inline` for older versions of msvc (up to Visual Studio 2013) */
#if defined(_MSC_VER) && _MSC_VER < 1900
#define inline __inline
#endif
WEPOLL_INTERNAL int ws_global_init(void);
WEPOLL_INTERNAL SOCKET ws_get_base_socket(SOCKET socket);
static bool init__done = false;
static INIT_ONCE init__once = INIT_ONCE_STATIC_INIT;
static BOOL CALLBACK init__once_callback(INIT_ONCE* once,
void* parameter,
void** context) {
unused_var(once);
unused_var(parameter);
unused_var(context);
/* N.b. that initialization order matters here. */
if (ws_global_init() < 0 || nt_global_init() < 0 ||
reflock_global_init() < 0 || epoll_global_init() < 0)
return FALSE;
init__done = true;
return TRUE;
}
int init(void) {
if (!init__done &&
!InitOnceExecuteOnce(&init__once, init__once_callback, NULL, NULL))
/* `InitOnceExecuteOnce()` itself is infallible, and it doesn't set any
* error code when the once-callback returns FALSE. We return -1 here to
* indicate that global initialization failed; the failing init function is
* resposible for setting `errno` and calling `SetLastError()`. */
return -1;
return 0;
}
/* Set up a workaround for the following problem:
* FARPROC addr = GetProcAddress(...);
* MY_FUNC func = (MY_FUNC) addr; <-- GCC 8 warning/error.
* MY_FUNC func = (MY_FUNC) (void*) addr; <-- MSVC warning/error.
* To compile cleanly with either compiler, do casts with this "bridge" type:
* MY_FUNC func = (MY_FUNC) (nt__fn_ptr_cast_t) addr; */
#ifdef __GNUC__
typedef void* nt__fn_ptr_cast_t;
#else
typedef FARPROC nt__fn_ptr_cast_t;
#endif
#define X(return_type, attributes, name, parameters) \
WEPOLL_INTERNAL return_type(attributes* name) parameters = NULL;
NT_NTDLL_IMPORT_LIST(X)
#undef X
int nt_global_init(void) {
HMODULE ntdll;
FARPROC fn_ptr;
ntdll = GetModuleHandleW(L"ntdll.dll");
if (ntdll == NULL)
return -1;
#define X(return_type, attributes, name, parameters) \
fn_ptr = GetProcAddress(ntdll, #name); \
if (fn_ptr == NULL) \
return -1; \
name = (return_type(attributes*) parameters)(nt__fn_ptr_cast_t) fn_ptr;
NT_NTDLL_IMPORT_LIST(X)
#undef X
return 0;
}
#include <string.h>
typedef struct poll_group poll_group_t;
typedef struct queue_node queue_node_t;
WEPOLL_INTERNAL poll_group_t* poll_group_acquire(port_state_t* port);
WEPOLL_INTERNAL void poll_group_release(poll_group_t* poll_group);
WEPOLL_INTERNAL void poll_group_delete(poll_group_t* poll_group);
WEPOLL_INTERNAL poll_group_t* poll_group_from_queue_node(
queue_node_t* queue_node);
WEPOLL_INTERNAL HANDLE
poll_group_get_afd_helper_handle(poll_group_t* poll_group);
typedef struct queue_node {
queue_node_t* prev;
queue_node_t* next;
} queue_node_t;
typedef struct queue {
queue_node_t head;
} queue_t;
WEPOLL_INTERNAL void queue_init(queue_t* queue);
WEPOLL_INTERNAL void queue_node_init(queue_node_t* node);
WEPOLL_INTERNAL queue_node_t* queue_first(const queue_t* queue);
WEPOLL_INTERNAL queue_node_t* queue_last(const queue_t* queue);
WEPOLL_INTERNAL void queue_prepend(queue_t* queue, queue_node_t* node);
WEPOLL_INTERNAL void queue_append(queue_t* queue, queue_node_t* node);
WEPOLL_INTERNAL void queue_move_first(queue_t* queue, queue_node_t* node);
WEPOLL_INTERNAL void queue_move_last(queue_t* queue, queue_node_t* node);
WEPOLL_INTERNAL void queue_remove(queue_node_t* node);
WEPOLL_INTERNAL bool queue_empty(const queue_t* queue);
WEPOLL_INTERNAL bool queue_enqueued(const queue_node_t* node);
static const size_t POLL_GROUP__MAX_GROUP_SIZE = 32;
typedef struct poll_group {
port_state_t* port_state;
queue_node_t queue_node;
HANDLE afd_helper_handle;
size_t group_size;
} poll_group_t;
static poll_group_t* poll_group__new(port_state_t* port_state) {
HANDLE iocp_handle = port_get_iocp_handle(port_state);
queue_t* poll_group_queue = port_get_poll_group_queue(port_state);
poll_group_t* poll_group = mm_malloc(sizeof *poll_group);
if (poll_group == NULL)
return_set_error(NULL, ERROR_NOT_ENOUGH_MEMORY);
memset(poll_group, 0, sizeof *poll_group);
queue_node_init(&poll_group->queue_node);
poll_group->port_state = port_state;
if (afd_create_helper_handle(iocp_handle, &poll_group->afd_helper_handle) <
0) {
mm_free(poll_group);
return NULL;
}
queue_append(poll_group_queue, &poll_group->queue_node);
return poll_group;
}
void poll_group_delete(poll_group_t* poll_group) {
assert(poll_group->group_size == 0);
CloseHandle(poll_group->afd_helper_handle);
queue_remove(&poll_group->queue_node);
mm_free(poll_group);
}
poll_group_t* poll_group_from_queue_node(queue_node_t* queue_node) {
return container_of(queue_node, poll_group_t, queue_node);
}
HANDLE poll_group_get_afd_helper_handle(poll_group_t* poll_group) {
return poll_group->afd_helper_handle;
}
poll_group_t* poll_group_acquire(port_state_t* port_state) {
queue_t* poll_group_queue = port_get_poll_group_queue(port_state);
poll_group_t* poll_group =
!queue_empty(poll_group_queue)
? container_of(