* file.c (rb_file_s_readlink): readlink(2) on AIX fails with ERANGE if

  buffer size is less than required.  fixed: [ruby-dev:27634]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/file.c b/file.c
index c1a69575f6..38db9d84ba 100644
--- a/file.c
+++ b/file.c
@@ -1982,7 +1982,13 @@ rb_file_s_readlink(VALUE klass, VALUE path)
     rb_secure(2);
     FilePathValue(path);
     buf = xmalloc(size);
-    while ((rv = readlink(StringValueCStr(path), buf, size)) == size) {
+    for (;;) {
+	rv = readlink(RSTRING(path)->ptr, buf, size);
+#ifndef _AIX
+	if (rv != size) break;
+#else
+	if (rv > 0 || errno != ERANGE) break;
+#endif
 	size *= 2;
 	buf = xrealloc(buf, size);
     }