1 files changed, 48 insertions, 8 deletions
diff --git a/src/nvim/lua/vim.lua b/src/nvim/lua/vim.lua
index b22020e6d5..e1bbb03d3f 100644
--- a/src/nvim/lua/vim.lua
+++ b/src/nvim/lua/vim.lua
@@ -1,18 +1,54 @@
--- Gets the children of process `ppid` via the shell.
+-- Internal-only until comments in #8107 are addressed.
+-- Returns:
+--    {errcode}, {output}
+local function _system(cmd)
+  local out = vim.api.nvim_call_function('system', { cmd })
+  local err = vim.api.nvim_get_vvar('shell_error')
+  return err, out
+end
+
+-- Gets process info from the `ps` command.
+-- Used by nvim_get_proc() as a fallback.
+local function _os_proc_info(pid)
+  if pid == nil or pid <= 0 or type(pid) ~= 'number' then
+    error('invalid pid')
+  end
+  local cmd = { 'ps', '-p', pid, '-o', 'ucomm=', }
+  local err, name = _system(cmd)
+  if 1 == err and string.gsub(name, '%s*', '') == '' then
+    return {}  -- Process not found.
+  elseif 0 ~= err then
+    local args_str = vim.api.nvim_call_function('string', { cmd })
+    error('command failed: '..args_str)
+  end
+  local _, ppid = _system({ 'ps', '-p', pid, '-o', 'ppid=', })
+  -- Remove trailing whitespace.
+  name = string.gsub(name, '%s+$', '')
+  ppid = string.gsub(ppid, '%s+$', '')
+  ppid = tonumber(ppid) == nil and -1 or tonumber(ppid)
+  return {
+    name = name,
+    pid = pid,
+    ppid = ppid,
+  }
+end
+
+-- Gets process children from the `pgrep` command.
 -- Used by nvim_get_proc_children() as a fallback.
 local function _os_proc_children(ppid)
   if ppid == nil or ppid <= 0 or type(ppid) ~= 'number' then
     error('invalid ppid')
   end
-  local out = vim.api.nvim_call_function('system', { 'pgrep -P '..ppid })
-  local err = vim.api.nvim_get_vvar('shell_error')
-  if 1 == err and out == '' then
+  local cmd = { 'pgrep', '-P', ppid, }
+  local err, rv = _system(cmd)
+  if 1 == err and string.gsub(rv, '%s*', '') == '' then
     return {}  -- Process not found.
   elseif 0 ~= err then
-    error('pgrep failed')
+    local args_str = vim.api.nvim_call_function('string', { cmd })
+    error('command failed: '..args_str)
   end
   local children = {}
-  for s in string.gmatch(out, '%S+') do
+  for s in string.gmatch(rv, '%S+') do
     local i = tonumber(s)
     if i ~= nil then
       table.insert(children, i)
@@ -81,8 +117,12 @@ local function _update_package_paths()
   end
   last_nvim_paths = cur_nvim_paths
 end
---{{{1 Module definition
-return {
+
+local module = {
   _update_package_paths = _update_package_paths,
   _os_proc_children = _os_proc_children,
+  _os_proc_info = _os_proc_info,
+  _system = _system,
 }
+
+return module