From c6bb8beb5294ce1162ea0f088707a9fe167449a7 Mon Sep 17 00:00:00 2001
From: kosaki <kosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 6 Mar 2011 15:25:58 +0000
Subject: [PATCH] * process.c (proc_getgroups): get rid of maxgroups
 dependency.   ngroups can be calculated dynamically.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31037 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 5 +++++
 process.c | 8 ++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 5f8d3a4f6b..9620802f44 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Mar  7 00:21:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* process.c (proc_getgroups): get rid of maxgroups dependency.
+	  ngroups can be calculated dynamically.
+
 Sun Mar  6 23:45:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* configure.in: rlim_t use standard RUBY_REPLACE_TYPE mechanism.
diff --git a/process.c b/process.c
index 51f3804f63..25ad168068 100644
--- a/process.c
+++ b/process.c
@@ -4563,9 +4563,13 @@ proc_getgroups(VALUE obj)
     int i, ngroups;
     rb_gid_t *groups;
 
-    groups = ALLOCA_N(rb_gid_t, maxgroups);
+    ngroups = getgroups(0, NULL);
+    if (ngroups == -1)
+	rb_sys_fail(0);
 
-    ngroups = getgroups(maxgroups, groups);
+    groups = ALLOCA_N(rb_gid_t, ngroups);
+
+    ngroups = getgroups(ngroups, groups);
     if (ngroups == -1)
 	rb_sys_fail(0);