From 2450cbe7a6a88bebb55b0f12e0c12f685f5a38cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Sat, 4 May 2019 11:28:17 +0200
Subject: [PATCH] bar: xcb: check return values of ftruncate(), read() and
 write()

Fixes building with -D_FORTIFY_SOURCE=2
---
 bar/xcb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/bar/xcb.c b/bar/xcb.c
index 30fdba0..f2dcd3c 100644
--- a/bar/xcb.c
+++ b/bar/xcb.c
@@ -311,7 +311,11 @@ loop(struct bar *_bar,
 
         if (fds[1].revents & POLLHUP) {
             LOG_WARN("disconnected from XCB");
-            write(_bar->abort_fd, &(uint64_t){1}, sizeof(uint64_t));
+            if (write(_bar->abort_fd, &(uint64_t){1}, sizeof(uint64_t))
+                != sizeof(uint64_t))
+            {
+                LOG_ERRNO("failed to signal abort to modules");
+            }
             break;
         }