/* ttyopen.c - ttyopen */ #include <conf.h> #include <kernel.h> /*------------------------------------------------------------------------ * ttyopen - open tty device and return descriptor (for namespace) *------------------------------------------------------------------------ */ ttyopen(devptr, nam, mode) struct devsw *devptr; char *nam; char *mode; { /* This routine is not usually used to open tty devices, */ /* but is provided so that automatic calls to open do not */ /* fail. It returns SYSERR unless called with a null name */ if (*nam == '\0') return( devptr->dvnum ); else return(SYSERR); }