lib/libc/gen/termios.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * @(#)termios.c        8.2 (Berkeley) 2/21/94
  32  * $FreeBSD: head/lib/libc/gen/termios.c 326025 2017-11-20 19:49:47Z pfg $
  33  */
  34
  35 #include "namespace.h"
  36 #include <sys/types.h>
  37 #include <sys/fcntl.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/time.h>
  40
  41 #include <errno.h>
  42 #include <string.h>
  43 #define TTYDEFCHARS
  44 #include <termios.h>
  45 #undef TTYDEFCHARS
  46 #include <unistd.h>
  47 #include "un-namespace.h"
  48
  49 int __tcdrain(int);
  50
  51 int
  52 tcgetattr(int fd, struct termios *t)
  53 {
  54
  55         return (_ioctl(fd, TIOCGETA, t));
  56 }
  57
  58 int
  59 tcsetattr(int fd, int opt, const struct termios *t)
  60 {
  61         struct termios localterm;
  62
  63         if (opt & TCSASOFT) {
  64                 localterm = *t;
  65                 localterm.c_cflag |= CIGNORE;
  66                 t = &localterm;
  67         }
  68         switch (opt & ~TCSASOFT) {
  69         case TCSANOW:
  70                 return (_ioctl(fd, TIOCSETA, t));
  71         case TCSADRAIN:
  72                 return (_ioctl(fd, TIOCSETAW, t));
  73         case TCSAFLUSH:
  74                 return (_ioctl(fd, TIOCSETAF, t));
  75         default:
  76                 errno = EINVAL;
  77                 return (-1);
  78         }
  79 }
  80
  81 int
  82 tcsetpgrp(int fd, pid_t pgrp)
  83 {
  84         int s;
  85
  86         s = pgrp;
  87         return (_ioctl(fd, TIOCSPGRP, &s));
  88 }
  89
  90 pid_t
  91 tcgetpgrp(int fd)
  92 {
  93         int s;
  94
  95         if (_ioctl(fd, TIOCGPGRP, &s) < 0)
  96                 return ((pid_t)-1);
  97
  98         return ((pid_t)s);
  99 }
 100
 101 pid_t
 102 tcgetsid(int fd)
 103 {
 104         int s;
 105
 106         if (_ioctl(fd, TIOCGSID, &s) < 0)
 107                 return ((pid_t)-1);
 108
 109         return ((pid_t)s);
 110 }
 111
 112 int
 113 tcsetsid(int fd, pid_t pid)
 114 {
 115
 116         if (pid != getsid(0)) {
 117                 errno = EINVAL;
 118                 return (-1);
 119         }
 120
 121         return (_ioctl(fd, TIOCSCTTY, NULL));
 122 }
 123
 124 speed_t
 125 cfgetospeed(const struct termios *t)
 126 {
 127
 128         return (t->c_ospeed);
 129 }
 130
 131 speed_t
 132 cfgetispeed(const struct termios *t)
 133 {
 134
 135         return (t->c_ispeed);
 136 }
 137
 138 int
 139 cfsetospeed(struct termios *t, speed_t speed)
 140 {
 141
 142         t->c_ospeed = speed;
 143         return (0);
 144 }
 145
 146 int
 147 cfsetispeed(struct termios *t, speed_t speed)
 148 {
 149
 150         t->c_ispeed = speed;
 151         return (0);
 152 }
 153
 154 int
 155 cfsetspeed(struct termios *t, speed_t speed)
 156 {
 157
 158         t->c_ispeed = t->c_ospeed = speed;
 159         return (0);
 160 }
 161
 162 /*
 163  * Make a pre-existing termios structure into "raw" mode: character-at-a-time
 164  * mode with no characters interpreted, 8-bit data path.
 165  */
 166 void
 167 cfmakeraw(struct termios *t)
 168 {
 169
 170         t->c_iflag &= ~(IMAXBEL|IXOFF|INPCK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IGNPAR);
 171         t->c_iflag |= IGNBRK;
 172         t->c_oflag &= ~OPOST;
 173         t->c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|ISIG|IEXTEN|NOFLSH|TOSTOP|PENDIN);
 174         t->c_cflag &= ~(CSIZE|PARENB);
 175         t->c_cflag |= CS8|CREAD;
 176         t->c_cc[VMIN] = 1;
 177         t->c_cc[VTIME] = 0;
 178 }
 179
 180 /*
 181  * Obtain a termios structure which is similar to the one provided by
 182  * the kernel.
 183  */
 184 void
 185 cfmakesane(struct termios *t)
 186 {
 187         t->c_cflag = TTYDEF_CFLAG;
 188         t->c_iflag = TTYDEF_IFLAG;
 189         t->c_lflag = TTYDEF_LFLAG;
 190         t->c_oflag = TTYDEF_OFLAG;
 191         t->c_ispeed = TTYDEF_SPEED;
 192         t->c_ospeed = TTYDEF_SPEED;
 193         memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
 194 }
 195
 196 int
 197 tcsendbreak(int fd, int len __unused)
 198 {
 199         struct timeval sleepytime;
 200
 201         sleepytime.tv_sec = 0;
 202         sleepytime.tv_usec = 400000;
 203         if (_ioctl(fd, TIOCSBRK, 0) == -1)
 204                 return (-1);
 205         _select(0, 0, 0, 0, &sleepytime);
 206         if (_ioctl(fd, TIOCCBRK, 0) == -1)
 207                 return (-1);
 208         return (0);
 209 }
 210
 211 int
 212 __tcdrain(int fd)
 213 {
 214         return (_ioctl(fd, TIOCDRAIN, 0));
 215 }
 216
 217 #ifndef _THREAD_SAFE
 218 __weak_reference(__tcdrain, tcdrain);
 219 #endif
 220
 221 int
 222 tcflush(int fd, int which)
 223 {
 224         int com;
 225
 226         switch (which) {
 227         case TCIFLUSH:
 228                 com = FREAD;
 229                 break;
 230         case TCOFLUSH:
 231                 com = FWRITE;
 232                 break;
 233         case TCIOFLUSH:
 234                 com = FREAD | FWRITE;
 235                 break;
 236         default:
 237                 errno = EINVAL;
 238                 return (-1);
 239         }
 240         return (_ioctl(fd, TIOCFLUSH, &com));
 241 }
 242
 243 int
 244 tcflow(int fd, int action)
 245 {
 246         struct termios term;
 247         u_char c;
 248
 249         switch (action) {
 250         case TCOOFF:
 251                 return (_ioctl(fd, TIOCSTOP, 0));
 252         case TCOON:
 253                 return (_ioctl(fd, TIOCSTART, 0));
 254         case TCION:
 255         case TCIOFF:
 256                 if (tcgetattr(fd, &term) == -1)
 257                         return (-1);
 258                 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
 259                 if (c != _POSIX_VDISABLE && _write(fd, &c, sizeof(c)) == -1)
 260                         return (-1);
 261                 return (0);
 262         default:
 263                 errno = EINVAL;
 264                 return (-1);
 265         }
 266         /* NOTREACHED */
 267 }