80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*-
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* Copyright (c) 1992 Christopher G. Demetriou
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* comcontrol.c */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <fcntl.h>
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void usage(char *progname)
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{
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fprintf(stderr, "usage: %s <filename> [[-]bidir]\n", progname);
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exit(1);
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}
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int main(int argc, char *argv[])
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{
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int fd;
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int res;
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if ((argc < 2) || (argc > 3)) usage(argv[0]);
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fd = open(argv[1], O_RDONLY|O_NONBLOCK, 0);
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if (fd < 0) {
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fprintf(stderr, "%s: couldn't open file %s\n", argv[0], argv[1]);
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perror("open");
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exit(1);
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}
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if (argc == 2) {
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if (ioctl(fd, TIOCMGBIDIR, &res) < 0) {
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perror("ioctl");
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exit(1);
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}
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if (!res) printf("-");
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printf("bidir\n");
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} else {
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if (!strcmp(argv[2],"bidir")) {
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res = 1;
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} else if (!strcmp(argv[2],"-bidir")) {
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res = 0;
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} else {
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usage(argv[0]);
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}
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if (ioctl(fd, TIOCMSBIDIR, &res) < 0) {
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perror("ioctl");
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exit(1);
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}
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}
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close(fd);
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}
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