* io.c (pipe_open): add RB_GC_GUARD.

	  This caused failure when test/ruby/test_argf.rb is executed with
	  GC.stress = true in mswin32_90


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@28114 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index d5fc02e299..6835cc0ef7 100644
--- a/io.c
+++ b/io.c
@@ -5112,6 +5112,9 @@ pipe_open(struct rb_exec_arg *eargp, VALUE prog, const char *modestr, int fmode,
 	    break;
 	}
     }
+
+    RB_GC_GUARD(argbuf);
+
     if (eargp)
 	rb_run_exec_options(&sarg, NULL);
     if ((fmode & FMODE_READABLE) && (fmode & FMODE_WRITABLE)) {