Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!husc6!rutgers!dayton!ems!quest!sheldon From: sheldon@quest.UUCP (Scott S. Bertilson) Newsgroups: comp.sys.att Subject: Re: RS232 Configuration on AT&T 7300 Message-ID: <1027@quest.UUCP> Date: Wed, 22-Jul-87 06:22:55 EDT Article-I.D.: quest.1027 Posted: Wed Jul 22 06:22:55 1987 Date-Received: Sat, 25-Jul-87 10:45:02 EDT References: <718@aplvax.UUCP> <286@intvax.UUCP> Reply-To: sheldon@quest.UUCP (Scott S. Bertilson) Distribution: na Organization: Quest Research Inc., Burnsville, MN Lines: 56 Here's a little program that a friend (Gene Olson) wrote to solve the problem of opening a line when there is no carrier. Works on all SysV machines as far as I know. (Including the UNIXpc.) An easy way to stick the file in the openable state is to: clocal tty000 sleep 10000 & You can then do "stty" and whatever else strikes your fancy. #include#include #include #include main(argc,argv) int argc ; char **argv ; { char device[50] ; struct termio tio ; if (argc < 3) { fprintf(stderr,"Usage: %s tty command [ param ... ]\n", *argv) ; exit(1) ; } strcpy(device,"/dev/") ; strcat(device,argv[1]) ; fclose(stdin) ; fclose(stdout) ; if (open(device,O_RDWR|O_NDELAY) != 0) { fprintf(stderr,"Cannot open: %s\n",device) ; exit(1) ; } dup(0) ; fprintf(stderr,"File now open\n") ; if (ioctl(0,TCGETA,&tio) < 0) { fprintf(stderr,"Ioctl TCGETA failed\n") ; exit(1) ; } tio.c_cflag |= CLOCAL ; if (ioctl(0,TCSETA,&tio) < 0) { fprintf(stderr,"Ioctl TCSETA failed\n") ; exit(1) ; } execvp(argv[2],&argv[2]) ; } -- Scott S. Bertilson ...ihnp4!quest!sheldon or scott@uc.msc.umn.edu