1 | /* `struct termios' speed frobnication functions. Linux version. |
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2 | Copyright (C) 1991, 92, 93, 95, 96, 97, 98, 2000 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | /* Modified by Jeff Johnston, May 27, 2002 to remove kernel hack |
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21 | as we simply ignore a cfisetspeed of 0 instead of treating it specially */ |
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22 | |
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23 | #include <stddef.h> |
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24 | #include <errno.h> |
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25 | #include <termios.h> |
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26 | |
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27 | /* Return the output baud rate stored in *TERMIOS_P. */ |
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28 | speed_t |
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29 | cfgetospeed (termios_p) |
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30 | const struct termios *termios_p; |
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31 | { |
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32 | return termios_p->c_cflag & (CBAUD | CBAUDEX); |
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33 | } |
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34 | |
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35 | /* Return the input baud rate stored in *TERMIOS_P. |
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36 | For Linux there is no difference between input and output |
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37 | speed. */ |
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38 | speed_t |
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39 | cfgetispeed (termios_p) |
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40 | const struct termios *termios_p; |
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41 | { |
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42 | return termios_p->c_cflag & (CBAUD | CBAUDEX); |
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43 | } |
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44 | |
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45 | /* Set the output baud rate stored in *TERMIOS_P to SPEED. */ |
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46 | int |
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47 | cfsetospeed (termios_p, speed) |
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48 | struct termios *termios_p; |
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49 | speed_t speed; |
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50 | { |
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51 | if ((speed & ~CBAUD) != 0 |
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52 | && (speed < B57600 || speed > __MAX_BAUD)) |
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53 | { |
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54 | errno = (EINVAL); |
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55 | return -1; |
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56 | } |
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57 | |
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58 | termios_p->c_cflag &= ~(CBAUD | CBAUDEX); |
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59 | termios_p->c_cflag |= speed; |
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60 | |
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61 | return 0; |
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62 | } |
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63 | |
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64 | /* Set the input baud rate stored in *TERMIOS_P to SPEED. |
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65 | Although for Linux there is no difference between input and output |
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66 | speed, the numerical 0 is a special case for the input baud rate. It |
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67 | should set the input baud rate to the output baud rate so we do |
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68 | nothing. */ |
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69 | int |
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70 | cfsetispeed (termios_p, speed) |
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71 | struct termios *termios_p; |
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72 | speed_t speed; |
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73 | { |
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74 | if ((speed & ~CBAUD) != 0 |
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75 | && (speed < B57600 || speed > __MAX_BAUD)) |
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76 | { |
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77 | errno = (EINVAL); |
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78 | return -1; |
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79 | } |
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80 | |
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81 | if (speed != 0) |
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82 | { |
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83 | termios_p->c_cflag &= ~(CBAUD | CBAUDEX); |
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84 | termios_p->c_cflag |= speed; |
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85 | } |
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86 | |
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87 | return 0; |
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88 | } |
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