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

diff --git a/slock.c b/slock.c
index 467937c..506231e 100644 (file)
--- 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;