ruby-dev

まつもと ゆきひろです

In message "[ruby-dev:10885] Re: setenv,unsetenv"
    on 00/09/11, Yukihiro Matsumoto <matz@zetabits.com> writes:

||そして，などのようにOSの環境などは書いていたのですが，どうやら
||sample/rbc.rbを使用した場合にのみ起こります．
||で，原因となっているのは，hash.c:1070行目の
||	free(environ[i])
||の部分です．
|
|再現しません。なぜだろう。見た限りでは見落としはなさそうなの
|だが。

分かりました。rbcはreadlineライブラリを使うのですが、これが
初期化ルーチンの内部でputenvを使っているため、environの値が
origenvironと食い違っていました。結果としてenvironの要素のコ
ピーが行われず、mallocされていない領域をfreeしていたのでした。

とりあえず、freeしようとする領域がorigenvironの対応する要素
と同じアドレスでないことを確認するようにして対処しました。も
ちろんputenvの実装によってはもうちょっとイヤらしいことになる
可能性も否定できませんが。

--- hash.c	2000/09/04 08:24:01	1.35
+++ hash.c	2000/09/11 07:33:24
@@ -1057,3 +1057,4 @@
     if (!value) {
-	free(environ[i]);
+	if (environ[i] != origenviron[i])
+	    free(environ[i]);
 	while (environ[i]) {
@@ -1069,3 +1070,4 @@
     else {
-	free(environ[i]);
+	if (environ[i] != origenviron[i])
+	    free(environ[i]);
     }

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[ruby-dev:10887] Re: setenv,unsetenv

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[#10959] match data — 助田　雅紀 <masaki.suketa@...>