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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <termios.h>
     30 #include <unistd.h>
     31 
     32 static speed_t cfgetspeed(const termios* s) {
     33   return (s->c_cflag & CBAUD);
     34 }
     35 
     36 speed_t cfgetispeed(const termios* s) {
     37   return cfgetspeed(s);
     38 }
     39 
     40 speed_t cfgetospeed(const termios* s) {
     41   return cfgetspeed(s);
     42 }
     43 
     44 void cfmakeraw(termios* s) {
     45   s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
     46   s->c_oflag &= ~OPOST;
     47   s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
     48   s->c_cflag &= ~(CSIZE|PARENB);
     49   s->c_cflag |= CS8;
     50 }
     51 
     52 int cfsetispeed(termios* s, speed_t speed) {
     53   return cfsetspeed(s, speed);
     54 }
     55 
     56 int cfsetospeed(termios* s, speed_t speed) {
     57   return cfsetspeed(s, speed);
     58 }
     59 
     60 int cfsetspeed(termios* s, speed_t speed) {
     61   // TODO: check 'speed' is valid.
     62   s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
     63   return 0;
     64 }
     65 
     66 int tcdrain(int fd) {
     67   // A non-zero argument to TCSBRK means "don't send a break".
     68   // The drain is a side-effect of the ioctl!
     69   return ioctl(fd, TCSBRK, static_cast<unsigned long>(1));
     70 }
     71 
     72 int tcflow(int fd, int action) {
     73   return ioctl(fd, TCXONC, static_cast<unsigned long>(action));
     74 }
     75 
     76 int tcflush(int fd, int queue) {
     77   return ioctl(fd, TCFLSH, static_cast<unsigned long>(queue));
     78 }
     79 
     80 int tcgetattr(int fd, termios* s) {
     81   return ioctl(fd, TCGETS, s);
     82 }
     83 
     84 pid_t tcgetsid(int fd) {
     85   pid_t sid;
     86   if (ioctl(fd, TIOCGSID, &sid) == -1) {
     87     return -1;
     88   }
     89   return sid;
     90 }
     91 
     92 int tcsendbreak(int fd, int duration) {
     93   return ioctl(fd, TCSBRKP, static_cast<unsigned long>(duration));
     94 }
     95 
     96 int tcsetattr(int fd, int optional_actions, const termios* s) {
     97   int cmd;
     98   switch (optional_actions) {
     99     case TCSANOW: cmd = TCSETS; break;
    100     case TCSADRAIN: cmd = TCSETSW; break;
    101     case TCSAFLUSH: cmd = TCSETSF; break;
    102     default: errno = EINVAL; return -1;
    103   }
    104   return ioctl(fd, cmd, s);
    105 }
    106 
    107 pid_t tcgetpgrp(int fd) {
    108   pid_t pid;
    109   if (ioctl(fd, TIOCGPGRP, &pid) == -1) {
    110     return -1;
    111   }
    112   return pid;
    113 }
    114 
    115 int tcsetpgrp(int fd, pid_t pid) {
    116   return ioctl(fd, TIOCSPGRP, &pid);
    117 }
    118