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 #include <unistd.h>
  46 #include "un-namespace.h"
  47
  48 int
  49 tcgetattr(int fd, struct termios *t)
  50 {
  51
  52         return (_ioctl(fd, TIOCGETA, t));
  53 }
  54
  55 int
  56 tcsetattr(int fd, int opt, const struct termios *t)
  57 {
  58         struct termios localterm;
  59
  60         if (opt & TCSASOFT) {
  61                 localterm = *t;
  62                 localterm.c_cflag |= CIGNORE;
  63                 t = &localterm;
  64         }
  65         switch (opt & ~TCSASOFT) {
  66         case TCSANOW:
  67                 return (_ioctl(fd, TIOCSETA, t));
  68         case TCSADRAIN:
  69                 return (_ioctl(fd, TIOCSETAW, t));
  70         case TCSAFLUSH:
  71                 return (_ioctl(fd, TIOCSETAF, t));
  72         default:
  73                 errno = EINVAL;
  74                 return (-1);
  75         }
  76 }
  77
  78 int
  79 tcsetpgrp(int fd, pid_t pgrp)
  80 {
  81         int s;
  82
  83         s = pgrp;
  84         return (_ioctl(fd, TIOCSPGRP, &s));
  85 }
  86
  87 pid_t
  88 tcgetpgrp(int fd)
  89 {
  90         int s;
  91
  92         if (_ioctl(fd, TIOCGPGRP, &s) < 0)
  93                 return ((pid_t)-1);
  94
  95         return ((pid_t)s);
  96 }
  97
  98 pid_t
  99 tcgetsid(int fd)
 100 {
 101         int s;
 102
 103         if (_ioctl(fd, TIOCGSID, &s) < 0)
 104                 return ((pid_t)-1);
 105
 106         return ((pid_t)s);
 107 }
 108
 109 int
 110 tcsetsid(int fd, pid_t pid)
 111 {
 112
 113         if (pid != getsid(0)) {
 114                 errno = EINVAL;
 115                 return (-1);
 116         }
 117
 118         return (_ioctl(fd, TIOCSCTTY, NULL));
 119 }
 120
 121 speed_t
 122 cfgetospeed(const struct termios *t)
 123 {
 124
 125         return (t->c_ospeed);
 126 }
 127
 128 speed_t
 129 cfgetispeed(const struct termios *t)
 130 {
 131
 132         return (t->c_ispeed);
 133 }
 134
 135 int
 136 cfsetospeed(struct termios *t, speed_t speed)
 137 {
 138
 139         t->c_ospeed = speed;
 140         return (0);
 141 }
 142
 143 int
 144 cfsetispeed(struct termios *t, speed_t speed)
 145 {
 146
 147         t->c_ispeed = speed;
 148         return (0);
 149 }
 150
 151 int
 152 cfsetspeed(struct termios *t, speed_t speed)
 153 {
 154
 155         t->c_ispeed = t->c_ospeed = speed;
 156         return (0);
 157 }
 158
 159 /*
 160  * Make a pre-existing termios structure into "raw" mode: character-at-a-time
 161  * mode with no characters interpreted, 8-bit data path.
 162  */
 163 void
 164 cfmakeraw(struct termios *t)
 165 {
 166
 167         t->c_iflag &= ~(IMAXBEL|IXOFF|INPCK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IGNPAR);
 168         t->c_iflag |= IGNBRK;
 169         t->c_oflag &= ~OPOST;
 170         t->c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|ISIG|IEXTEN|NOFLSH|TOSTOP|PENDIN);
 171         t->c_cflag &= ~(CSIZE|PARENB);
 172         t->c_cflag |= CS8|CREAD;
 173         t->c_cc[VMIN] = 1;
 174         t->c_cc[VTIME] = 0;
 175 }
 176
 177 /*
 178  * Obtain a termios structure which is similar to the one provided by
 179  * the kernel.
 180  */
 181 void
 182 cfmakesane(struct termios *t)
 183 {
 184         t->c_cflag = TTYDEF_CFLAG;
 185         t->c_iflag = TTYDEF_IFLAG;
 186         t->c_lflag = TTYDEF_LFLAG;
 187         t->c_oflag = TTYDEF_OFLAG;
 188         t->c_ispeed = TTYDEF_SPEED;
 189         t->c_ospeed = TTYDEF_SPEED;
 190         memcpy(&t->c_cc, ttydefchars, sizeof ttydefchars);
 191 }
 192
 193 int
 194 tcsendbreak(int fd, int len __unused)
 195 {
 196         struct timeval sleepytime;
 197
 198         sleepytime.tv_sec = 0;
 199         sleepytime.tv_usec = 400000;
 200         if (_ioctl(fd, TIOCSBRK, 0) == -1)
 201                 return (-1);
 202         _select(0, 0, 0, 0, &sleepytime);
 203         if (_ioctl(fd, TIOCCBRK, 0) == -1)
 204                 return (-1);
 205         return (0);
 206 }
 207
 208 int
 209 __tcdrain(int fd)
 210 {
 211         return (_ioctl(fd, TIOCDRAIN, 0));
 212 }
 213
 214 #ifndef _THREAD_SAFE
 215 __weak_reference(__tcdrain, tcdrain);
 216 #endif
 217
 218 int
 219 tcflush(int fd, int which)
 220 {
 221         int com;
 222
 223         switch (which) {
 224         case TCIFLUSH:
 225                 com = FREAD;
 226                 break;
 227         case TCOFLUSH:
 228                 com = FWRITE;
 229                 break;
 230         case TCIOFLUSH:
 231                 com = FREAD | FWRITE;
 232                 break;
 233         default:
 234                 errno = EINVAL;
 235                 return (-1);
 236         }
 237         return (_ioctl(fd, TIOCFLUSH, &com));
 238 }
 239
 240 int
 241 tcflow(int fd, int action)
 242 {
 243         struct termios term;
 244         u_char c;
 245
 246         switch (action) {
 247         case TCOOFF:
 248                 return (_ioctl(fd, TIOCSTOP, 0));
 249         case TCOON:
 250                 return (_ioctl(fd, TIOCSTART, 0));
 251         case TCION:
 252         case TCIOFF:
 253                 if (tcgetattr(fd, &term) == -1)
 254                         return (-1);
 255                 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
 256                 if (c != _POSIX_VDISABLE && _write(fd, &c, sizeof(c)) == -1)
 257                         return (-1);
 258                 return (0);
 259         default:
 260                 errno = EINVAL;
 261                 return (-1);
 262         }
 263         /* NOTREACHED */
 264 }