From: sin <sin@2f30.org>
Date: Thu, 14 Nov 2013 11:24:08 +0000 (+0000)
Subject: Set errno to 0 before getpwuid() and check it afterwards
X-Git-Url: https://git.danieliu.xyz/?a=commitdiff_plain;h=6a5512835485ac501d983161ca15b311a95c5649;p=slock.git

Set errno to 0 before getpwuid() and check it afterwards
---

diff --git a/slock.c b/slock.c
index 467937c..506231e 100644
--- a/slock.c
+++ b/slock.c
@@ -65,8 +65,11 @@ getpw(void) { /* only run as root */
 	const char *rval;
 	struct passwd *pw;
 
+	errno = 0;
 	pw = getpwuid(getuid());
-	if(!pw)
+	if (errno)
+		die("slock: getpwuid: %s\n", strerror(errno));
+	else if (!pw)
 		die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
 	endpwent();
 	rval =  pw->pw_passwd;