/* * Copyright (c) 1994 Geoffrey M. Rehmet * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Geoffrey M. Rehmet * 4. The name of the author may not be used to endorse or promote products * derived from this software withough specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $Id: lptcontrol.c,v 1.1.1.1 1994/09/03 13:10:09 csgr Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #define PATH_LPCTL _PATH_DEV "lpctl" #define DEFAULT_UNIT "0" #define IRQ_INVALID -1 #define DO_POLL 0 #define USE_IRQ 1 static void usage(const char * progname) { fprintf(stderr, "usage: %s -i | -p [-u ]\n", progname); fprintf(stderr, "\tUnit no. is a value in the range 0 to 3\n"); fprintf(stderr, "\tThe default unit no is 0 (ie. /dev/lpt0)\n"); exit(1); } static void set_interrupt_status(int irq_status, const char * file) { int fd; if((fd = open(file, O_WRONLY, 0660)) < 0) { perror("open"); exit(1); } if(ioctl(fd, LPT_IRQ, &irq_status) < 0) { perror("ioctl"); exit(1); } close(fd); } static char * dev_file(char unit_no) { static char devname[_POSIX_PATH_MAX+1]; int len; strncpy(devname, PATH_LPCTL, _POSIX_PATH_MAX); devname[len = strlen(devname)] = unit_no; devname[++len] = '\0'; return(devname); } int main (int argc, char * argv[]) { int opt; int irq_status = IRQ_INVALID; char * unit = DEFAULT_UNIT; while((opt = getopt(argc, argv, "ipu:")) != -1) switch(opt) { case 'i': irq_status = USE_IRQ; break; case 'p': irq_status = DO_POLL; break; case 'u': unit = optarg; if(!isdigit(*unit)) usage(argv[0]); break; default : usage(argv[0]); } if(irq_status == IRQ_INVALID) usage(argv[0]); set_interrupt_status(irq_status, dev_file(*unit)); exit(0); }