check result of ftruncate() as we do write() below

ok beck@

1 files changed, 4 insertions, 2 deletions

diff --git a/src/usr.sbin/ocspcheck/ocspcheck.c b/src/usr.sbin/ocspcheck/ocspcheck.c
index 551a8fa091..41700f91a0 100644
--- a/src/usr.sbin/ocspcheck/ocspcheck.c
+++ b/src/usr.sbin/ocspcheck/ocspcheck.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ocspcheck.c,v 1.24 2017/12/01 14:42:23 visa Exp $ */
+/* $OpenBSD: ocspcheck.c,v 1.25 2019/05/15 13:44:18 bcook Exp $ */
 
 /*
  * Copyright (c) 2017 Bob Beck <beck@openbsd.org>
@@ -670,7 +670,9 @@ main(int argc, char **argv)
          * write out the DER format response to the staplefd
          */
         if (staplefd >= 0) {
-                (void) ftruncate(staplefd, 0);
+                while (ftruncate(staplefd, 0) < 0)
+                        if (errno != EINTR && errno != EAGAIN)
+                                err(1, "Write of OCSP response failed");
                 w = 0;
                 written = 0;
                 while (written < instaplesz) {