--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/src/uv-common.h	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,474 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+ * This file is private to libuv. It provides common functionality to both
+ * Windows and Unix backends.
+ */
+
+#ifndef UV_COMMON_H_
+#define UV_COMMON_H_
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "uv.h"
+#include "uv/tree.h"
+#include "queue.h"
+#include "strscpy.h"
+
+#ifndef _MSC_VER
+# include <stdatomic.h>
+#endif
+
+#if EDOM > 0
+# define UV__ERR(x) (-(x))
+#else
+# define UV__ERR(x) (x)
+#endif
+
+#if !defined(snprintf) && defined(_MSC_VER) && _MSC_VER < 1900
+extern int snprintf(char*, size_t, const char*, ...);
+#endif
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+#define ARRAY_END(a)  ((a) + ARRAY_SIZE(a))
+
+#define container_of(ptr, type, member) \
+  ((type *) ((char *) (ptr) - offsetof(type, member)))
+
+/* C11 defines static_assert to be a macro which calls _Static_assert. */
+#if defined(static_assert)
+#define STATIC_ASSERT(expr) static_assert(expr, #expr)
+#else
+#define STATIC_ASSERT(expr)                                                   \
+  void uv__static_assert(int static_assert_failed[1 - 2 * !(expr)])
+#endif
+
+#ifdef _MSC_VER
+#define uv__exchange_int_relaxed(p, v)                                        \
+  InterlockedExchangeNoFence((LONG volatile*)(p), v)
+#else
+#define uv__exchange_int_relaxed(p, v)                                        \
+  atomic_exchange_explicit((_Atomic int*)(p), v, memory_order_relaxed)
+#endif
+
+#define UV__UDP_DGRAM_MAXSIZE (64 * 1024)
+
+/* Handle flags. Some flags are specific to Windows or UNIX. */
+enum {
+  /* Used by all handles. */
+  UV_HANDLE_CLOSING                     = 0x00000001,
+  UV_HANDLE_CLOSED                      = 0x00000002,
+  UV_HANDLE_ACTIVE                      = 0x00000004,
+  UV_HANDLE_REF                         = 0x00000008,
+  UV_HANDLE_INTERNAL                    = 0x00000010,
+  UV_HANDLE_ENDGAME_QUEUED              = 0x00000020,
+
+  /* Used by streams. */
+  UV_HANDLE_LISTENING                   = 0x00000040,
+  UV_HANDLE_CONNECTION                  = 0x00000080,
+  UV_HANDLE_SHUT                        = 0x00000200,
+  UV_HANDLE_READ_PARTIAL                = 0x00000400,
+  UV_HANDLE_READ_EOF                    = 0x00000800,
+
+  /* Used by streams and UDP handles. */
+  UV_HANDLE_READING                     = 0x00001000,
+  UV_HANDLE_BOUND                       = 0x00002000,
+  UV_HANDLE_READABLE                    = 0x00004000,
+  UV_HANDLE_WRITABLE                    = 0x00008000,
+  UV_HANDLE_READ_PENDING                = 0x00010000,
+  UV_HANDLE_SYNC_BYPASS_IOCP            = 0x00020000,
+  UV_HANDLE_ZERO_READ                   = 0x00040000,
+  UV_HANDLE_EMULATE_IOCP                = 0x00080000,
+  UV_HANDLE_BLOCKING_WRITES             = 0x00100000,
+  UV_HANDLE_CANCELLATION_PENDING        = 0x00200000,
+
+  /* Used by uv_tcp_t and uv_udp_t handles */
+  UV_HANDLE_IPV6                        = 0x00400000,
+
+  /* Only used by uv_tcp_t handles. */
+  UV_HANDLE_TCP_NODELAY                 = 0x01000000,
+  UV_HANDLE_TCP_KEEPALIVE               = 0x02000000,
+  UV_HANDLE_TCP_SINGLE_ACCEPT           = 0x04000000,
+  UV_HANDLE_TCP_ACCEPT_STATE_CHANGING   = 0x08000000,
+  UV_HANDLE_SHARED_TCP_SOCKET           = 0x10000000,
+
+  /* Only used by uv_udp_t handles. */
+  UV_HANDLE_UDP_PROCESSING              = 0x01000000,
+  UV_HANDLE_UDP_CONNECTED               = 0x02000000,
+  UV_HANDLE_UDP_RECVMMSG                = 0x04000000,
+
+  /* Only used by uv_pipe_t handles. */
+  UV_HANDLE_NON_OVERLAPPED_PIPE         = 0x01000000,
+  UV_HANDLE_PIPESERVER                  = 0x02000000,
+
+  /* Only used by uv_tty_t handles. */
+  UV_HANDLE_TTY_READABLE                = 0x01000000,
+  UV_HANDLE_UNUSED0                     = 0x02000000,
+  UV_HANDLE_TTY_SAVED_POSITION          = 0x04000000,
+  UV_HANDLE_TTY_SAVED_ATTRIBUTES        = 0x08000000,
+
+  /* Only used by uv_signal_t handles. */
+  UV_SIGNAL_ONE_SHOT_DISPATCHED         = 0x01000000,
+  UV_SIGNAL_ONE_SHOT                    = 0x02000000,
+
+  /* Only used by uv_poll_t handles. */
+  UV_HANDLE_POLL_SLOW                   = 0x01000000,
+
+  /* Only used by uv_process_t handles. */
+  UV_HANDLE_REAP                        = 0x10000000
+};
+
+static inline int uv__is_raw_tty_mode(uv_tty_mode_t m) {
+  return m == UV_TTY_MODE_RAW || m == UV_TTY_MODE_RAW_VT;
+}
+
+int uv__loop_configure(uv_loop_t* loop, uv_loop_option option, va_list ap);
+
+void uv__loop_close(uv_loop_t* loop);
+
+int uv__read_start(uv_stream_t* stream,
+                   uv_alloc_cb alloc_cb,
+                   uv_read_cb read_cb);
+
+int uv__tcp_bind(uv_tcp_t* tcp,
+                 const struct sockaddr* addr,
+                 unsigned int addrlen,
+                 unsigned int flags);
+
+int uv__tcp_connect(uv_connect_t* req,
+                   uv_tcp_t* handle,
+                   const struct sockaddr* addr,
+                   unsigned int addrlen,
+                   uv_connect_cb cb);
+
+int uv__udp_init_ex(uv_loop_t* loop,
+                    uv_udp_t* handle,
+                    unsigned flags,
+                    int domain);
+
+int uv__udp_bind(uv_udp_t* handle,
+                 const struct sockaddr* addr,
+                 unsigned int  addrlen,
+                 unsigned int flags);
+
+int uv__udp_connect(uv_udp_t* handle,
+                    const struct sockaddr* addr,
+                    unsigned int addrlen);
+
+int uv__udp_disconnect(uv_udp_t* handle);
+
+int uv__udp_is_connected(uv_udp_t* handle);
+
+int uv__udp_send(uv_udp_send_t* req,
+                 uv_udp_t* handle,
+                 const uv_buf_t bufs[],
+                 unsigned int nbufs,
+                 const struct sockaddr* addr,
+                 unsigned int addrlen,
+                 uv_udp_send_cb send_cb);
+
+int uv__udp_try_send(uv_udp_t* handle,
+                     const uv_buf_t bufs[],
+                     unsigned int nbufs,
+                     const struct sockaddr* addr,
+                     unsigned int addrlen);
+
+int uv__udp_try_send2(uv_udp_t* handle,
+                      unsigned int count,
+                      uv_buf_t* bufs[/*count*/],
+                      unsigned int nbufs[/*count*/],
+                      struct sockaddr* addrs[/*count*/]);
+
+int uv__udp_recv_start(uv_udp_t* handle, uv_alloc_cb alloccb,
+                       uv_udp_recv_cb recv_cb);
+
+int uv__udp_recv_stop(uv_udp_t* handle);
+
+void uv__fs_poll_close(uv_fs_poll_t* handle);
+
+int uv__getaddrinfo_translate_error(int sys_err);    /* EAI_* error. */
+
+enum uv__work_kind {
+  UV__WORK_CPU,
+  UV__WORK_FAST_IO,
+  UV__WORK_SLOW_IO
+};
+
+void uv__work_submit(uv_loop_t* loop,
+                     struct uv__work *w,
+                     enum uv__work_kind kind,
+                     void (*work)(struct uv__work *w),
+                     void (*done)(struct uv__work *w, int status));
+
+void uv__work_done(uv_async_t* handle);
+
+size_t uv__count_bufs(const uv_buf_t bufs[], unsigned int nbufs);
+
+int uv__socket_sockopt(uv_handle_t* handle, int optname, int* value);
+
+void uv__fs_scandir_cleanup(uv_fs_t* req);
+void uv__fs_readdir_cleanup(uv_fs_t* req);
+uv_dirent_type_t uv__fs_get_dirent_type(uv__dirent_t* dent);
+
+int uv__next_timeout(const uv_loop_t* loop);
+void uv__run_timers(uv_loop_t* loop);
+void uv__timer_close(uv_timer_t* handle);
+
+void uv__process_title_cleanup(void);
+void uv__signal_cleanup(void);
+void uv__threadpool_cleanup(void);
+
+#define uv__has_active_reqs(loop)                                             \
+  ((loop)->active_reqs.count > 0)
+
+#define uv__req_register(loop)                                                \
+  do {                                                                        \
+    (loop)->active_reqs.count++;                                              \
+  }                                                                           \
+  while (0)
+
+#define uv__req_unregister(loop)                                              \
+  do {                                                                        \
+    assert(uv__has_active_reqs(loop));                                        \
+    (loop)->active_reqs.count--;                                              \
+  }                                                                           \
+  while (0)
+
+#define uv__has_active_handles(loop)                                          \
+  ((loop)->active_handles > 0)
+
+#define uv__active_handle_add(h)                                              \
+  do {                                                                        \
+    (h)->loop->active_handles++;                                              \
+  }                                                                           \
+  while (0)
+
+#define uv__active_handle_rm(h)                                               \
+  do {                                                                        \
+    (h)->loop->active_handles--;                                              \
+  }                                                                           \
+  while (0)
+
+#define uv__is_active(h)                                                      \
+  (((h)->flags & UV_HANDLE_ACTIVE) != 0)
+
+#define uv__is_closing(h)                                                     \
+  (((h)->flags & (UV_HANDLE_CLOSING | UV_HANDLE_CLOSED)) != 0)
+
+#if defined(_WIN32)
+# define uv__is_stream_shutting(h)                                            \
+  (h->stream.conn.shutdown_req != NULL)
+#else
+# define uv__is_stream_shutting(h)                                            \
+  (h->shutdown_req != NULL)
+#endif
+
+#define uv__handle_start(h)                                                   \
+  do {                                                                        \
+    if (((h)->flags & UV_HANDLE_ACTIVE) != 0) break;                          \
+    (h)->flags |= UV_HANDLE_ACTIVE;                                           \
+    if (((h)->flags & UV_HANDLE_REF) != 0) uv__active_handle_add(h);          \
+  }                                                                           \
+  while (0)
+
+#define uv__handle_stop(h)                                                    \
+  do {                                                                        \
+    if (((h)->flags & UV_HANDLE_ACTIVE) == 0) break;                          \
+    (h)->flags &= ~UV_HANDLE_ACTIVE;                                          \
+    if (((h)->flags & UV_HANDLE_REF) != 0) uv__active_handle_rm(h);           \
+  }                                                                           \
+  while (0)
+
+#define uv__handle_ref(h)                                                     \
+  do {                                                                        \
+    if (((h)->flags & UV_HANDLE_REF) != 0) break;                             \
+    (h)->flags |= UV_HANDLE_REF;                                              \
+    if (((h)->flags & UV_HANDLE_CLOSING) != 0) break;                         \
+    if (((h)->flags & UV_HANDLE_ACTIVE) != 0) uv__active_handle_add(h);       \
+  }                                                                           \
+  while (0)
+
+#define uv__handle_unref(h)                                                   \
+  do {                                                                        \
+    if (((h)->flags & UV_HANDLE_REF) == 0) break;                             \
+    (h)->flags &= ~UV_HANDLE_REF;                                             \
+    if (((h)->flags & UV_HANDLE_CLOSING) != 0) break;                         \
+    if (((h)->flags & UV_HANDLE_ACTIVE) != 0) uv__active_handle_rm(h);        \
+  }                                                                           \
+  while (0)
+
+#define uv__has_ref(h)                                                        \
+  (((h)->flags & UV_HANDLE_REF) != 0)
+
+#if defined(_WIN32)
+# define uv__handle_platform_init(h) ((h)->u.fd = -1)
+#else
+# define uv__handle_platform_init(h) ((h)->next_closing = NULL)
+#endif
+
+#define uv__handle_init(loop_, h, type_)                                      \
+  do {                                                                        \
+    (h)->loop = (loop_);                                                      \
+    (h)->type = (type_);                                                      \
+    (h)->flags = UV_HANDLE_REF;  /* Ref the loop when active. */              \
+    uv__queue_insert_tail(&(loop_)->handle_queue, &(h)->handle_queue);        \
+    uv__handle_platform_init(h);                                              \
+  }                                                                           \
+  while (0)
+
+/* Note: uses an open-coded version of SET_REQ_SUCCESS() because of
+ * a circular dependency between src/uv-common.h and src/win/internal.h.
+ */
+#if defined(_WIN32)
+# define UV_REQ_INIT(req, typ)                                                \
+  do {                                                                        \
+    (req)->type = (typ);                                                      \
+    (req)->u.io.overlapped.Internal = 0;  /* SET_REQ_SUCCESS() */             \
+  }                                                                           \
+  while (0)
+#else
+# define UV_REQ_INIT(req, typ)                                                \
+  do {                                                                        \
+    (req)->type = (typ);                                                      \
+  }                                                                           \
+  while (0)
+#endif
+
+#define uv__req_init(loop, req, typ)                                          \
+  do {                                                                        \
+    UV_REQ_INIT(req, typ);                                                    \
+    uv__req_register(loop);                                                   \
+  }                                                                           \
+  while (0)
+
+#define uv__get_internal_fields(loop)                                         \
+  ((uv__loop_internal_fields_t*) loop->internal_fields)
+
+#define uv__get_loop_metrics(loop)                                            \
+  (&uv__get_internal_fields(loop)->loop_metrics)
+
+#define uv__metrics_inc_loop_count(loop)                                      \
+  do {                                                                        \
+    uv__get_loop_metrics(loop)->metrics.loop_count++;                         \
+  } while (0)
+
+#define uv__metrics_inc_events(loop, e)                                       \
+  do {                                                                        \
+    uv__get_loop_metrics(loop)->metrics.events += (e);                        \
+  } while (0)
+
+#define uv__metrics_inc_events_waiting(loop, e)                               \
+  do {                                                                        \
+    uv__get_loop_metrics(loop)->metrics.events_waiting += (e);                \
+  } while (0)
+
+/* Allocator prototypes */
+void *uv__calloc(size_t count, size_t size);
+char *uv__strdup(const char* s);
+char *uv__strndup(const char* s, size_t n);
+void* uv__malloc(size_t size);
+void uv__free(void* ptr);
+void* uv__realloc(void* ptr, size_t size);
+void* uv__reallocf(void* ptr, size_t size);
+
+typedef struct uv__loop_metrics_s uv__loop_metrics_t;
+typedef struct uv__loop_internal_fields_s uv__loop_internal_fields_t;
+
+struct uv__loop_metrics_s {
+  uv_metrics_t metrics;
+  uint64_t provider_entry_time;
+  uint64_t provider_idle_time;
+  uv_mutex_t lock;
+};
+
+void uv__metrics_update_idle_time(uv_loop_t* loop);
+void uv__metrics_set_provider_entry_time(uv_loop_t* loop);
+
+#ifdef __linux__
+struct uv__iou {
+  uint32_t* sqhead;
+  uint32_t* sqtail;
+  uint32_t sqmask;
+  uint32_t* sqflags;
+  uint32_t* cqhead;
+  uint32_t* cqtail;
+  uint32_t cqmask;
+  void* sq;   /* pointer to munmap() on event loop teardown */
+  void* cqe;  /* pointer to array of struct uv__io_uring_cqe */
+  void* sqe;  /* pointer to array of struct uv__io_uring_sqe */
+  size_t sqlen;
+  size_t cqlen;
+  size_t maxlen;
+  size_t sqelen;
+  int ringfd;
+  uint32_t in_flight;
+};
+#endif  /* __linux__ */
+
+struct uv__loop_internal_fields_s {
+  unsigned int flags;
+  uv__loop_metrics_t loop_metrics;
+  int current_timeout;
+#ifdef __linux__
+  struct uv__iou ctl;
+  struct uv__iou iou;
+  void* inv;  /* used by uv__platform_invalidate_fd() */
+#endif  /* __linux__ */
+};
+
+#if defined(_WIN32)
+# define UV_PTHREAD_MAX_NAMELEN_NP 32767
+#elif defined(__APPLE__)
+# define UV_PTHREAD_MAX_NAMELEN_NP 64
+#elif defined(__NetBSD__) || defined(__illumos__)
+# define UV_PTHREAD_MAX_NAMELEN_NP PTHREAD_MAX_NAMELEN_NP
+#elif defined (__linux__)
+# define UV_PTHREAD_MAX_NAMELEN_NP 16
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+# define UV_PTHREAD_MAX_NAMELEN_NP (MAXCOMLEN + 1)
+#else
+# define UV_PTHREAD_MAX_NAMELEN_NP 16
+#endif
+
+/* Open-coded so downstream users don't have to link libm. */
+static inline int uv__isinf(double d) {
+  uint64_t v;
+
+  STATIC_ASSERT(sizeof(v) == sizeof(d));
+  memcpy(&v, &d, sizeof(v));
+  return (v << 1 >> 53) == 2047 && !(v << 12);
+}
+
+/* Open-coded so downstream users don't have to link libm. */
+static inline int uv__isnan(double d) {
+  uint64_t v;
+
+  STATIC_ASSERT(sizeof(v) == sizeof(d));
+  memcpy(&v, &d, sizeof(v));
+  return (v << 1 >> 53) == 2047 && !!(v << 12);
+}
+
+#endif /* UV_COMMON_H_ */