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

1 files changed, 4 insertions, 1 deletions

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;