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
  50 tcgetattr(int fd, struct termios *t)
  51 {
  52
  53         return (_ioctl(fd, TIOCGETA, t));
  54 }
  55
  56 int
  57 tcsetattr(int fd, int opt, const struct termios *t)
  58 {
  59         struct termios localterm;
  60
  61         if (opt & TCSASOFT) {
  62                 localterm = *t;
  63                 localterm.c_cflag |= CIGNORE;
  64                 t = &localterm;
  65         }
  66         switch (opt & ~TCSASOFT) {
  67         case TCSANOW:
  68                 return (_ioctl(fd, TIOCSETA, t));
  69         case TCSADRAIN:
  70                 return (_ioctl(fd, TIOCSETAW, t));
  71         case TCSAFLUSH:
  72                 return (_ioctl(fd, TIOCSETAF, t));
  73         default:
  74                 errno = EINVAL;
  75                 return (-1);
  76         }
  77 }
  78
  79 int
  80 tcsetpgrp(int fd, pid_t pgrp)
  81 {
  82         int s;
  83
  84         s = pgrp;
  85         return (_ioctl(fd, TIOCSPGRP, &s));
  86 }
  87
  88 pid_t
  89 tcgetpgrp(int fd)
  90 {
  91         int s;
  92
  93         if (_ioctl(fd, TIOCGPGRP, &s) < 0)
  94                 return ((pid_t)-1);
  95
  96         return ((pid_t)s);
  97 }
  98
  99 pid_t
 100 tcgetsid(int fd)
 101 {
 102         int s;
 103
 104         if (_ioctl(fd, TIOCGSID, &s) < 0)
 105                 return ((pid_t)-1);
 106
 107         return ((pid_t)s);
 108 }
 109
 110 int
 111 tcsetsid(int fd, pid_t pid)
 112 {
 113
 114         if (pid != getsid(0)) {
 115                 errno = EINVAL;
 116                 return (-1);
 117         }
 118
 119         return (_ioctl(fd, TIOCSCTTY, NULL));
 120 }
 121
 122 speed_t
 123 cfgetospeed(const struct termios *t)
 124 {
 125
 126         return (t->c_ospeed);
 127 }
 128
 129 speed_t
 130 cfgetispeed(const struct termios *t)
 131 {
 132
 133         return (t->c_ispeed);
 134 }
 135
 136 int
 137 cfsetospeed(struct termios *t, speed_t speed)
 138 {
 139
 140         t->c_ospeed = speed;
 141         return (0);
 142 }
 143
 144 int
 145 cfsetispeed(struct termios *t, speed_t speed)
 146 {
 147
 148         t->c_ispeed = speed;
 149         return (0);
 150 }
 151
 152 int
 153 cfsetspeed(struct termios *t, speed_t speed)
 154 {
 155
 156         t->c_ispeed = t->c_ospeed = speed;
 157         return (0);
 158 }
 159
 160 /*
 161  * Make a pre-existing termios structure into "raw" mode: character-at-a-time
 162  * mode with no characters interpreted, 8-bit data path.
 163  */
 164 void
 165 cfmakeraw(struct termios *t)
 166 {
 167
 168         t->c_iflag &= ~(IMAXBEL|IXOFF|INPCK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IGNPAR);
 169         t->c_iflag |= IGNBRK;
 170         t->c_oflag &= ~OPOST;
 171         t->c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|ISIG|IEXTEN|NOFLSH|TOSTOP|PENDIN);
 172         t->c_cflag &= ~(CSIZE|PARENB);
 173         t->c_cflag |= CS8|CREAD;
 174         t->c_cc[VMIN] = 1;
 175         t->c_cc[VTIME] = 0;
 176 }
 177
 178 /*
 179  * Obtain a termios structure which is similar to the one provided by
 180  * the kernel.
 181  */
 182 void
 183 cfmakesane(struct termios *t)
 184 {
 185         t->c_cflag = TTYDEF_CFLAG;
 186         t->c_iflag = TTYDEF_IFLAG;
 187         t->c_lflag = TTYDEF_LFLAG;
 188         t->c_oflag = TTYDEF_OFLAG;
 189         t->c_ispeed = TTYDEF_SPEED;
 190         t->c_ospeed = TTYDEF_SPEED;
 191         memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
 192 }
 193
 194 int
 195 tcsendbreak(int fd, int len __unused)
 196 {
 197         struct timeval sleepytime;
 198
 199         sleepytime.tv_sec = 0;
 200         sleepytime.tv_usec = 400000;
 201         if (_ioctl(fd, TIOCSBRK, 0) == -1)
 202                 return (-1);
 203         _select(0, 0, 0, 0, &sleepytime);
 204         if (_ioctl(fd, TIOCCBRK, 0) == -1)
 205                 return (-1);
 206         return (0);
 207 }
 208
 209 int
 210 __tcdrain(int fd)
 211 {
 212         return (_ioctl(fd, TIOCDRAIN, 0));
 213 }
 214
 215 #ifndef _THREAD_SAFE
 216 __weak_reference(__tcdrain, tcdrain);
 217 #endif
 218
 219 int
 220 tcflush(int fd, int which)
 221 {
 222         int com;
 223
 224         switch (which) {
 225         case TCIFLUSH:
 226                 com = FREAD;
 227                 break;
 228         case TCOFLUSH:
 229                 com = FWRITE;
 230                 break;
 231         case TCIOFLUSH:
 232                 com = FREAD | FWRITE;
 233                 break;
 234         default:
 235                 errno = EINVAL;
 236                 return (-1);
 237         }
 238         return (_ioctl(fd, TIOCFLUSH, &com));
 239 }
 240
 241 int
 242 tcflow(int fd, int action)
 243 {
 244         struct termios term;
 245         u_char c;
 246
 247         switch (action) {
 248         case TCOOFF:
 249                 return (_ioctl(fd, TIOCSTOP, 0));
 250         case TCOON:
 251                 return (_ioctl(fd, TIOCSTART, 0));
 252         case TCION:
 253         case TCIOFF:
 254                 if (tcgetattr(fd, &term) == -1)
 255                         return (-1);
 256                 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
 257                 if (c != _POSIX_VDISABLE && _write(fd, &c, sizeof(c)) == -1)
 258                         return (-1);
 259                 return (0);
 260         default:
 261                 errno = EINVAL;
 262                 return (-1);
 263         }
 264         /* NOTREACHED */
 265 }