1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1992 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 *    products derived from this software without specific written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32#include <ctype.h>
33#include <err.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40#include <sys/types.h>
41#include <sys/ioctl.h>
42
43static void usage(void) __dead2;
44
45static void
46usage(void)
47{
48	fprintf(stderr,
49	"usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n");
50	exit(1);
51}
52
53int
54main(int argc, char *argv[])
55{
56	int	fd;
57	int     res = 0;
58	int     print_dtrwait = 1, print_drainwait = 1;
59	int     dtrwait = -1, drainwait = -1;
60
61	if (argc < 2)
62		usage();
63
64	if (strcmp(argv[1], "-") == 0)
65		fd = STDIN_FILENO;
66	else {
67		fd = open(argv[1], O_RDONLY|O_NONBLOCK, 0);
68		if (fd < 0) {
69			warn("couldn't open file %s", argv[1]);
70			return 1;
71		}
72	}
73	if (argc == 2) {
74		if (ioctl(fd, TIOCMGDTRWAIT, &dtrwait) < 0) {
75			print_dtrwait = 0;
76			if (errno != ENOTTY) {
77				res = 1;
78				warn("TIOCMGDTRWAIT");
79			}
80		}
81		if (ioctl(fd, TIOCGDRAINWAIT, &drainwait) < 0) {
82			print_drainwait = 0;
83			if (errno != ENOTTY) {
84				res = 1;
85				warn("TIOCGDRAINWAIT");
86			}
87		}
88		if (print_dtrwait)
89			printf("dtrwait %d ", dtrwait);
90		if (print_drainwait)
91			printf("drainwait %d ", drainwait);
92		printf("\n");
93	} else {
94		while (argv[2] != NULL) {
95			if (!strcmp(argv[2],"dtrwait")) {
96				if (dtrwait >= 0)
97					usage();
98				if (argv[3] == NULL || !isdigit(argv[3][0]))
99					usage();
100				dtrwait = atoi(argv[3]);
101				argv += 2;
102			} else if (!strcmp(argv[2],"drainwait")) {
103				if (drainwait >= 0)
104					usage();
105				if (argv[3] == NULL || !isdigit(argv[3][0]))
106					usage();
107				drainwait = atoi(argv[3]);
108				argv += 2;
109			} else
110				usage();
111		}
112		if (dtrwait >= 0) {
113			if (ioctl(fd, TIOCMSDTRWAIT, &dtrwait) < 0) {
114				res = 1;
115				warn("TIOCMSDTRWAIT");
116			}
117		}
118		if (drainwait >= 0) {
119			if (ioctl(fd, TIOCSDRAINWAIT, &drainwait) < 0) {
120				res = 1;
121				warn("TIOCSDRAINWAIT");
122			}
123		}
124	}
125
126	close(fd);
127	return res;
128}
129