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 __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) __dead2; 46 47 static void 48 usage(void) 49 { 50 fprintf(stderr, 51 "usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n"); 52 exit(1); 53 } 54 55 int 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