From 69fb8c62a31e767be1464a7ccfe2a5bac331c4cc Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Mon, 18 Jul 2022 12:39:01 +0000
Subject:  Fix allread errno management

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/librandom/random_devurandom.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/librandom/random_devurandom.c')

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 ;
 }
-- 
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