From 1b27958bfb62041721d010c42ee6670bcdd76341 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 3 Jan 2005 05:13:18 +0000
Subject: * random.c (random_seed): don't use /dev/urandom if it is not
 character device.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7716 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 random.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'random.c')

diff --git a/random.c b/random.c
index e8fa78b944..3f34b04158 100644
--- a/random.c
+++ b/random.c
@@ -175,17 +175,29 @@ random_seed()
     unsigned long result;
     int fd;
     unsigned long buf;
+    struct stat statbuf;
 
     gettimeofday(&tv, 0);
     result = tv.tv_sec ^ tv.tv_usec ^ getpid() ^ n++;
 
     result += (unsigned long)&result;
 
-    if ((fd = open("/dev/urandom", O_RDONLY)) >= 0) {
-        read(fd, &buf, sizeof(buf));
+#ifdef S_ISCHR
+    if ((fd = open("/dev/urandom", O_RDONLY|O_NONBLOCK
+#ifdef O_NOCTTY
+            |O_NOCTTY
+#endif
+#ifdef O_NOFOLLOW
+            |O_NOFOLLOW
+#endif
+            )) >= 0) {
+        if (fstat(fd, &statbuf) == 0 && S_ISCHR(statbuf.st_mode)) {
+            read(fd, &buf, sizeof(buf));
+            result ^= buf;
+        }
         close(fd);
-        result ^= buf;
     }
+#endif
 
     return result;
 }
-- 
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