sbin/comcontrol/comcontrol.c

   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
  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 }