[444] | 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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