Hi Ricardo, > -#define MODE_RWX S_IFIFO | S_IRWXU | S_IRWXG | S_IRWXO > -#define MODE_SGID S_IFIFO | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO ... > +#define MODE_RWX 0777 > +#define MODE_SGID 2777 Also here and in mknod05.c it should be 02777 or S_ISGID. Kind regards, Petr