+Nejsou prava na port - musis byt root

diff --git a/lptgpib.c b/lptgpib.c
index 2a9f244..c5bbd62 100644 (file)
--- a/lptgpib.c
+++ b/lptgpib.c
@@ -84,7 +84,10 @@ void sig_handler(int sig){
 
 void lptgpib_init(int base){
         lpt_base = base;
-        ioperm(lpt_base, 4, 1);
+        if (ioperm(lpt_base, 4, 1) != 0) {
+         fprintf(stderr,"Nejsou prava na port - musis byt root: %m\n");
+         exit(1);
+       }
         
        /* set realtime priority and lock us in memory */
        struct sched_param scp;