1 /* 2 * Copyright (c) 1994 Geoffrey M. Rehmet 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Geoffrey M. Rehmet 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software withough specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $Id: lptcontrol.c,v 1.1.1.1 1994/09/03 13:10:09 csgr Exp $ 31 */ 32 33 #include <ctype.h> 34 #include <limits.h> 35 #include <paths.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include <machine/lpt.h> 42 #include <sys/errno.h> 43 #include <sys/file.h> 44 #include <sys/ioctl.h> 45 #include <sys/types.h> 46 47 48 #define PATH_LPCTL _PATH_DEV "lpctl" 49 #define DEFAULT_UNIT "0" 50 #define IRQ_INVALID -1 51 #define DO_POLL 0 52 #define USE_IRQ 1 53 54 static void usage(const char * progname) 55 { 56 fprintf(stderr, "usage: %s -i | -p [-u <unit no.>]\n", progname); 57 fprintf(stderr, "\tUnit no. is a value in the range 0 to 3\n"); 58 fprintf(stderr, "\tThe default unit no is 0 (ie. /dev/lpt0)\n"); 59 exit(1); 60 } 61 62 static void set_interrupt_status(int irq_status, const char * file) 63 { 64 int fd; 65 66 if((fd = open(file, O_WRONLY, 0660)) < 0) { 67 perror("open"); 68 exit(1); 69 } 70 if(ioctl(fd, LPT_IRQ, &irq_status) < 0) { 71 perror("ioctl"); 72 exit(1); 73 } 74 close(fd); 75 } 76 77 static char * dev_file(char unit_no) 78 { 79 static char devname[_POSIX_PATH_MAX+1]; 80 int len; 81 82 strncpy(devname, PATH_LPCTL, _POSIX_PATH_MAX); 83 devname[len = strlen(devname)] = unit_no; 84 devname[++len] = '\0'; 85 86 return(devname); 87 } 88 89 int main (int argc, char * argv[]) 90 { 91 int opt; 92 int irq_status = IRQ_INVALID; 93 char * unit = DEFAULT_UNIT; 94 95 while((opt = getopt(argc, argv, "ipu:")) != -1) 96 switch(opt) { 97 case 'i': irq_status = USE_IRQ; break; 98 case 'p': irq_status = DO_POLL; break; 99 case 'u': unit = optarg; 100 if(!isdigit(*unit)) 101 usage(argv[0]); 102 break; 103 default : usage(argv[0]); 104 } 105 if(irq_status == IRQ_INVALID) 106 usage(argv[0]); 107 108 set_interrupt_status(irq_status, dev_file(*unit)); 109 110 exit(0); 111 } 112 113 114