1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
33
34 #include <ctype.h>
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <sys/types.h>
43 #include <sys/ioctl.h>
44
45 static void usage(void);
46
47 static void
usage(void)48 usage(void)
49 {
50 fprintf(stderr,
51 "usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n");
52 exit(1);
53 }
54
55 int
main(int argc,char * argv[])56 main(int argc, char *argv[])
57 {
58 int fd;
59 int res = 0;
60 int print_dtrwait = 1, print_drainwait = 1;
61 int dtrwait = -1, drainwait = -1;
62
63 if (argc < 2)
64 usage();
65
66 if (strcmp(argv[1], "-") == 0)
67 fd = STDIN_FILENO;
68 else {
69 fd = open(argv[1], O_RDONLY|O_NONBLOCK, 0);
70 if (fd < 0) {
71 warn("couldn't open file %s", argv[1]);
72 return 1;
73 }
74 }
75 if (argc == 2) {
76 if (ioctl(fd, TIOCMGDTRWAIT, &dtrwait) < 0) {
77 print_dtrwait = 0;
78 if (errno != ENOTTY) {
79 res = 1;
80 warn("TIOCMGDTRWAIT");
81 }
82 }
83 if (ioctl(fd, TIOCGDRAINWAIT, &drainwait) < 0) {
84 print_drainwait = 0;
85 if (errno != ENOTTY) {
86 res = 1;
87 warn("TIOCGDRAINWAIT");
88 }
89 }
90 if (print_dtrwait)
91 printf("dtrwait %d ", dtrwait);
92 if (print_drainwait)
93 printf("drainwait %d ", drainwait);
94 printf("\n");
95 } else {
96 while (argv[2] != NULL) {
97 if (!strcmp(argv[2],"dtrwait")) {
98 if (dtrwait >= 0)
99 usage();
100 if (argv[3] == NULL || !isdigit(argv[3][0]))
101 usage();
102 dtrwait = atoi(argv[3]);
103 argv += 2;
104 } else if (!strcmp(argv[2],"drainwait")) {
105 if (drainwait >= 0)
106 usage();
107 if (argv[3] == NULL || !isdigit(argv[3][0]))
108 usage();
109 drainwait = atoi(argv[3]);
110 argv += 2;
111 } else
112 usage();
113 }
114 if (dtrwait >= 0) {
115 if (ioctl(fd, TIOCMSDTRWAIT, &dtrwait) < 0) {
116 res = 1;
117 warn("TIOCMSDTRWAIT");
118 }
119 }
120 if (drainwait >= 0) {
121 if (ioctl(fd, TIOCSDRAINWAIT, &drainwait) < 0) {
122 res = 1;
123 warn("TIOCSDRAINWAIT");
124 }
125 }
126 }
127
128 close(fd);
129 return res;
130 }
131