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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 <errno.h>
     30 #include <termios.h>
     31 #include <unistd.h>
     32 
     33 static speed_t cfgetspeed(const termios* s) {
     34   return (s->c_cflag & CBAUD);
     35 }
     36 
     37 speed_t cfgetispeed(const termios* s) {
     38   return cfgetspeed(s);
     39 }
     40 
     41 speed_t cfgetospeed(const termios* s) {
     42   return cfgetspeed(s);
     43 }
     44 
     45 void cfmakeraw(termios* s) {
     46   s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
     47   s->c_oflag &= ~OPOST;
     48   s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
     49   s->c_cflag &= ~(CSIZE|PARENB);
     50   s->c_cflag |= CS8;
     51 }
     52 
     53 int cfsetispeed(termios* s, speed_t speed) {
     54   return cfsetspeed(s, speed);
     55 }
     56 
     57 int cfsetospeed(termios* s, speed_t speed) {
     58   return cfsetspeed(s, speed);
     59 }
     60 
     61 int cfsetspeed(termios* s, speed_t speed) {
     62   // TODO: check 'speed' is valid.
     63   s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
     64   return 0;
     65 }
     66 
     67 int tcdrain(int fd) {
     68   // A non-zero argument to TCSBRK means "don't send a break".
     69   // The drain is a side-effect of the ioctl!
     70   return ioctl(fd, TCSBRK, static_cast<unsigned long>(1));
     71 }
     72 
     73 int tcflow(int fd, int action) {
     74   return ioctl(fd, TCXONC, static_cast<unsigned long>(action));
     75 }
     76 
     77 int tcflush(int fd, int queue) {
     78   return ioctl(fd, TCFLSH, static_cast<unsigned long>(queue));
     79 }
     80 
     81 int tcgetattr(int fd, termios* s) {
     82   return ioctl(fd, TCGETS, s);
     83 }
     84 
     85 pid_t tcgetsid(int fd) {
     86   pid_t sid;
     87   if (ioctl(fd, TIOCGSID, &sid) == -1) {
     88     return -1;
     89   }
     90   return sid;
     91 }
     92 
     93 int tcsendbreak(int fd, int duration) {
     94   return ioctl(fd, TCSBRKP, static_cast<unsigned long>(duration));
     95 }
     96 
     97 int tcsetattr(int fd, int optional_actions, const termios* s) {
     98   int cmd;
     99   switch (optional_actions) {
    100     case TCSANOW: cmd = TCSETS; break;
    101     case TCSADRAIN: cmd = TCSETSW; break;
    102     case TCSAFLUSH: cmd = TCSETSF; break;
    103     default: errno = EINVAL; return -1;
    104   }
    105   return ioctl(fd, cmd, s);
    106 }
    107 
    108 pid_t tcgetpgrp(int fd) {
    109   pid_t pid;
    110   if (ioctl(fd, TIOCGPGRP, &pid) == -1) {
    111     return -1;
    112   }
    113   return pid;
    114 }
    115 
    116 int tcsetpgrp(int fd, pid_t pid) {
    117   return ioctl(fd, TIOCSPGRP, &pid);
    118 }
    119