From: Florian Fainelli <f.fainelli@gmail.com>
Date: Sat, 15 Jul 2017 17:59:51 +0000 (-0700)
Subject: upgraded: Check chroot() return value
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=commitdiff_plain;h=13f252f39d2f870d01884d1b0cf0a91a1a669d03

upgraded: Check chroot() return value

Check the chroot() return value, fixes unused return value warnings/errors:

procd-2017-06-22-e5e99c46/upgraded/upgraded.c:78:8: error: ignoring return
value of 'chroot', declared with attribute warn_unused_result
[-Werror=unused-result] chroot(".");

Fixes: 056d8ddda8d5 ("upgraded: link dynamically, chroot during exec")
Reviewed-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---

diff --git a/upgraded/upgraded.c b/upgraded/upgraded.c
index 09c623c..220da79 100644
--- a/upgraded/upgraded.c
+++ b/upgraded/upgraded.c
@@ -78,7 +78,10 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	chroot(".");
+	if (chroot(".") < 0) {
+		fprintf(stderr, "failed to chroot: %s\n", strerror(errno));
+		return 1;
+	}
 
 	if (fchdir(fd) == -1) {
 		fprintf(stderr, "failed to chdir to prefix directory: %s\n", strerror(errno));