sbin/comcontrol/comcontrol.c

   1 /*-
   2  * Copyright (c) 1992 Christopher G. Demetriou
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote
  14  *    products derived from this software without specific written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  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);
  44
  45 static void
  46 usage()
  47 {
  48         fprintf(stderr,
  49         "usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n");
  50         exit(1);
  51 }
  52
  53 int
  54 main(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 }