From 2efc0f237a7f3d05fe243dfb352c722432572a98 Mon Sep 17 00:00:00 2001
From: Chris Rawnsley <566719+casr@users.noreply.github.com>
Date: Mon, 6 Jul 2026 06:35:07 +0100
Subject: [PATCH 3/3] Revert "fix(excmd): use realtime for v:starttime, :uptime
 #39425"

This revert can be removed once MacPort's libuv is upgraded equal to or
beyond 1.45.0.

Previous attempts to update MacPort's libuv version have been attempted
in the past but nothing has been merged yet. See related links below.

See: https://github.com/macports/macports-ports/pull/27671
See: https://github.com/macports/macports-ports/pull/27670
See: https://github.com/macports/macports-ports/pull/21329
See: https://github.com/macports/macports-ports/pull/20421

This reverts commit 822778f7e56bd6340a5d590056f35e93e4a02fa1.
---
 runtime/doc/news.txt                |  2 +-
 runtime/doc/vvars.txt               |  4 ++--
 runtime/lua/vim/_meta/vvars.gen.lua |  4 ++--
 src/nvim/main.c                     |  2 +-
 src/nvim/os/time.c                  | 19 -------------------
 src/nvim/vvars.lua                  |  4 ++--
 6 files changed, 8 insertions(+), 27 deletions(-)

diff --git a/runtime/doc/news.txt b/runtime/doc/news.txt
index 1ab7346ff0..e4a8bc2070 100644
--- a/runtime/doc/news.txt
+++ b/runtime/doc/news.txt
@@ -453,7 +453,7 @@ VIMSCRIPT
 • |v:vim_did_init| is set after sourcing |init.vim| but before |load-plugins|.
 • |prompt_appendbuf()| appends text to prompt-buffer.
 • |v:exitreason| is set before |QuitPre|.
-• |v:starttime| is the process start time (nanoseconds since UNIX epoch).
+• |v:starttime| is the process start time (monotonic nanoseconds).
 
 ==============================================================================
 CHANGED FEATURES                                                 *news-changed*
diff --git a/runtime/doc/vvars.txt b/runtime/doc/vvars.txt
index e61bc78624..6a885f6a4f 100644
--- a/runtime/doc/vvars.txt
+++ b/runtime/doc/vvars.txt
@@ -635,11 +635,11 @@ v:stacktrace
 
 				*v:starttime* *starttime-variable*
 v:starttime
-		Timestamp (nanoseconds since UNIX epoch) when the Nvim process
+		Timestamp (monotonic nanoseconds) when the Nvim process
 		started.
 
 		To see the current "uptime": >lua
-		  vim.print(('uptime: %d seconds'):format(os.time() - (vim.v.starttime / 1e9)))
+		  vim.print(('uptime: %d seconds'):format((vim.uv.hrtime() - vim.v.starttime) / 1e9))
 <
 		Read-only.
 
diff --git a/runtime/lua/vim/_meta/vvars.gen.lua b/runtime/lua/vim/_meta/vvars.gen.lua
index 543d4169c1..7b5ca0e417 100644
--- a/runtime/lua/vim/_meta/vvars.gen.lua
+++ b/runtime/lua/vim/_meta/vvars.gen.lua
@@ -667,13 +667,13 @@ vim.v.shell_error = ...
 --- @type table[]
 vim.v.stacktrace = ...
 
---- Timestamp (nanoseconds since UNIX epoch) when the Nvim process
+--- Timestamp (monotonic nanoseconds) when the Nvim process
 --- started.
 ---
 --- To see the current "uptime":
 ---
 --- ```lua
----   vim.print(('uptime: %d seconds'):format(os.time() - (vim.v.starttime / 1e9)))
+---   vim.print(('uptime: %d seconds'):format((vim.uv.hrtime() - vim.v.starttime) / 1e9))
 --- ```
 ---
 --- Read-only.
diff --git a/src/nvim/main.c b/src/nvim/main.c
index bbd8db1ee9..dc957526f3 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -197,7 +197,7 @@ void early_init(mparm_T *paramp)
   estack_init();
   cmdline_init();
   eval_init();          // init global variables
-  set_vim_var_nr(VV_STARTTIME, (varnumber_T)os_realtime());
+  set_vim_var_nr(VV_STARTTIME, (varnumber_T)os_hrtime());
   init_path(argv0 ? argv0 : "nvim");
   init_normal_cmds();   // Init the table of Normal mode commands.
   runtime_init();
diff --git a/src/nvim/os/time.c b/src/nvim/os/time.c
index 2e6bf3e56d..f243eda047 100644
--- a/src/nvim/os/time.c
+++ b/src/nvim/os/time.c
@@ -32,25 +32,6 @@ uint64_t os_hrtime(void)
   return uv_hrtime();
 }
 
-/// Obtain the current system time from a high-resolution
-/// real-time clock source.
-///
-/// The real-time clock counts from the UNIX epoch (1970-01-01)
-/// and is subject to time adjustments; it can jump back in time.
-///
-/// @return Nanoseconds since epoch or 0
-int64_t os_realtime(void)
-  FUNC_ATTR_WARN_UNUSED_RESULT
-{
-  uv_timespec64_t ts = { 0 };
-  int error_number;
-  if ((error_number = uv_clock_gettime(UV_CLOCK_REALTIME, &ts)) != 0) {
-    ELOG("uv_clock_gettime failed: %d %s", error_number, uv_err_name(error_number));
-    return 0;
-  }
-  return ts.tv_sec * 1000000000L + ts.tv_nsec;
-}
-
 /// Gets a millisecond-resolution, monotonically-increasing time relative to an
 /// arbitrary time in the past.
 ///
diff --git a/src/nvim/vvars.lua b/src/nvim/vvars.lua
index db87bcda28..648e5f1310 100644
--- a/src/nvim/vvars.lua
+++ b/src/nvim/vvars.lua
@@ -756,11 +756,11 @@ M.vars = {
   starttime = {
     type = 'integer',
     desc = [=[
-      Timestamp (nanoseconds since UNIX epoch) when the Nvim process
+      Timestamp (monotonic nanoseconds) when the Nvim process
       started.
 
       To see the current "uptime": >lua
-        vim.print(('uptime: %d seconds'):format(os.time() - (vim.v.starttime / 1e9)))
+        vim.print(('uptime: %d seconds'):format((vim.uv.hrtime() - vim.v.starttime) / 1e9))
       <
       Read-only.
     ]=],
-- 
2.55.0