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