https://git.ruby-lang.org/ruby.git/commit/?id=2f0f56bdca

From 2f0f56bdcae865ea62fdca3834038b8db6d6b9a4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 19 Jan 2022 11:50:04 +0900
Subject: [DOC] Enhanced Process.groups related

* On some platforms (e.g., macOS), the user's default group access
  list may exceed `NGROUPS_MAX`.
* Use upcase "GID" instead of "gid" for other than variable names.
---
 process.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/process.c b/process.c
index 672c2df9a9b..83c44fdd489 100644
--- a/process.c
+++ b/process.c
@@ -6852,6 +6852,7 @@ maxgroups(void) https://github.com/ruby/ruby/blob/trunk/process.c#L6852
  *  - the result is sorted
  *  - the result includes effective GIDs
  *  - the result does not include duplicated GIDs
+ *  - the result size does not exceed the value of Process.maxgroups
  *
  *  You can make sure to get a sorted unique GID list of
  *  the current process by this expression:
@@ -6946,10 +6947,10 @@ proc_setgroups(VALUE obj, VALUE ary) https://github.com/ruby/ruby/blob/trunk/process.c#L6947
  *
  *  Initializes the supplemental group access list by reading the
  *  system group database and using all groups of which the given user
- *  is a member. The group with the specified <em>gid</em> is also
- *  added to the list. Returns the resulting Array of the
- *  gids of all the groups in the supplementary group access list. Not
- *  available on all platforms.
+ *  is a member. The group with the specified _gid_ is also added to
+ *  the list. Returns the resulting Array of the GIDs of all the
+ *  groups in the supplementary group access list. Not available on
+ *  all platforms.
  *
  *     Process.groups   #=> [0, 1, 2, 3, 4, 6, 10, 11, 20, 26, 27]
  *     Process.initgroups( "mgranger", 30 )   #=> [30, 6, 10, 11]
@@ -6974,7 +6975,7 @@ proc_initgroups(VALUE obj, VALUE uname, VALUE base_grp) https://github.com/ruby/ruby/blob/trunk/process.c#L6975
  *  call-seq:
  *     Process.maxgroups   -> integer
  *
- *  Returns the maximum number of gids allowed in the supplemental
+ *  Returns the maximum number of GIDs allowed in the supplemental
  *  group access list.
  *
  *     Process.maxgroups   #=> 32
@@ -6994,7 +6995,7 @@ proc_getmaxgroups(VALUE obj) https://github.com/ruby/ruby/blob/trunk/process.c#L6995
  *  call-seq:
  *     Process.maxgroups= integer   -> integer
  *
- *  Sets the maximum number of gids allowed in the supplemental group
+ *  Sets the maximum number of GIDs allowed in the supplemental group
  *  access list.
  */
 
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