From b608a3d963003925e3e9406185a0497bf1be6fd5 Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Sun, 29 Jul 2018 23:57:30 +0200
Subject: [PATCH] caps: handle EINTR in read()

We don't want to link caps.{c,h} against utils.{c,h} for the sake of our static
builds init.lxc.static. This means lxc_write_nointr() will not be available. So
handle it EINTR.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 src/lxc/caps.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/lxc/caps.c b/src/lxc/caps.c
index a697856ac5..5638c712e1 100644
--- a/src/lxc/caps.c
+++ b/src/lxc/caps.c
@@ -315,7 +315,11 @@ static int _real_caps_last_cap(void)
 		char *ptr;
 		int n;
 
-		if ((n = read(fd, buf, 31)) >= 0) {
+	again:
+		n = read(fd, buf, 31);
+		if (n < 0 && errno == EINTR) {
+			goto again;
+		} else if (n >= 0) {
 			buf[n] = '\0';
 			errno = 0;