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

diff --git a/slock.c b/slock.c
index 467937cee0c0474ea98b5bfb1bf7c2c9b2a9cbd4..506231e16ee779633e5cc4d0e838372f26d42175 100644 (file)
--- a/slock.c
+++ b/slock.c
@@ -65,8 +65,11 @@ getpw(void) { /* only run as root */
        const char *rval;
        struct passwd *pw;
 
        const char *rval;
        struct passwd *pw;
 

+       errno = 0;

        pw = getpwuid(getuid());
        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;
                die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
        endpwent();
        rval =  pw->pw_passwd;