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
43 static void usage(void) __dead2;
44
45 static void
usage(void)46 usage(void)
47 {
48 fprintf(stderr,
49 "usage: comcontrol <filename> [drainwait <n>]\n");
50 exit(1);
51 }
52
53 int
main(int argc,char * argv[])54 main(int argc, char *argv[])
55 {
56 int fd;
57 int res = 0;
58 int print_drainwait = 1;
59 int 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, TIOCGDRAINWAIT, &drainwait) < 0) {
75 print_drainwait = 0;
76 if (errno != ENOTTY) {
77 res = 1;
78 warn("TIOCGDRAINWAIT");
79 }
80 }
81 if (print_drainwait)
82 printf("drainwait %d ", drainwait);
83 printf("\n");
84 } else {
85 while (argv[2] != NULL) {
86 if (!strcmp(argv[2],"drainwait")) {
87 if (drainwait >= 0)
88 usage();
89 if (argv[3] == NULL || !isdigit(argv[3][0]))
90 usage();
91 drainwait = atoi(argv[3]);
92 argv += 2;
93 } else
94 usage();
95 }
96 if (drainwait >= 0) {
97 if (ioctl(fd, TIOCSDRAINWAIT, &drainwait) < 0) {
98 res = 1;
99 warn("TIOCSDRAINWAIT");
100 }
101 }
102 }
103
104 close(fd);
105 return res;
106 }
107