1 files changed, 4 insertions, 0 deletions
diff --git a/src/librandom/random_devurandom.c b/src/librandom/random_devurandom.c
index 0ad752b..5f6b791 100644
--- a/src/librandom/random_devurandom.c
+++ b/src/librandom/random_devurandom.c
@@ -1,6 +1,7 @@
 /* ISC license. */
 
 #include <stddef.h>
+#include <errno.h>
 
 #include <skalibs/allreadwrite.h>
 #include <skalibs/strerr2.h>
@@ -11,12 +12,15 @@ void random_devurandom (char *s, size_t n)
 {
   static int random_fd = -1 ;
   size_t r ;
+  int e = errno ;
   if (random_fd < 0)
   {
     random_fd = openbc_read("/dev/urandom") ;
     if (random_fd < 0)
       strerr_diefu2sys(111, "open ", "/dev/urandom") ;
   }
+  errno = EPIPE ;
   r = allread(random_fd, s, n) ;
   if (r < n) strerr_diefu2sys(111, "read from ", "/dev/urandom") ;
+  errno = e ;
 }