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      1 /*
      2  * Copyright (C) 2016 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 #ifndef _BITS_TERMIOS_INLINES_H_
     30 #define _BITS_TERMIOS_INLINES_H_
     31 
     32 #include <errno.h>
     33 #include <sys/cdefs.h>
     34 #include <sys/ioctl.h>
     35 #include <sys/types.h>
     36 
     37 #include <linux/termios.h>
     38 
     39 #if !defined(__BIONIC_TERMIOS_INLINE)
     40 #define __BIONIC_TERMIOS_INLINE static __inline
     41 #endif
     42 
     43 __BEGIN_DECLS
     44 
     45 static __inline speed_t cfgetspeed(const struct termios* s) {
     46   return __BIONIC_CAST(static_cast, speed_t, s->c_cflag & CBAUD);
     47 }
     48 
     49 __BIONIC_TERMIOS_INLINE speed_t cfgetispeed(const struct termios* s) {
     50   return cfgetspeed(s);
     51 }
     52 
     53 __BIONIC_TERMIOS_INLINE speed_t cfgetospeed(const struct termios* s) {
     54   return cfgetspeed(s);
     55 }
     56 
     57 __BIONIC_TERMIOS_INLINE void cfmakeraw(struct termios* s) {
     58   s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
     59   s->c_oflag &= ~OPOST;
     60   s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
     61   s->c_cflag &= ~(CSIZE|PARENB);
     62   s->c_cflag |= CS8;
     63 }
     64 
     65 __BIONIC_TERMIOS_INLINE int cfsetspeed(struct termios* s, speed_t speed) {
     66   // TODO: check 'speed' is valid.
     67   s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
     68   return 0;
     69 }
     70 
     71 __BIONIC_TERMIOS_INLINE int cfsetispeed(struct termios* s, speed_t speed) {
     72   return cfsetspeed(s, speed);
     73 }
     74 
     75 __BIONIC_TERMIOS_INLINE int cfsetospeed(struct termios* s, speed_t speed) {
     76   return cfsetspeed(s, speed);
     77 }
     78 
     79 __BIONIC_TERMIOS_INLINE int tcdrain(int fd) {
     80   // A non-zero argument to TCSBRK means "don't send a break".
     81   // The drain is a side-effect of the ioctl!
     82   return ioctl(fd, TCSBRK, __BIONIC_CAST(static_cast, unsigned long, 1));
     83 }
     84 
     85 __BIONIC_TERMIOS_INLINE int tcflow(int fd, int action) {
     86   return ioctl(fd, TCXONC, __BIONIC_CAST(static_cast, unsigned long, action));
     87 }
     88 
     89 __BIONIC_TERMIOS_INLINE int tcflush(int fd, int queue) {
     90   return ioctl(fd, TCFLSH, __BIONIC_CAST(static_cast, unsigned long, queue));
     91 }
     92 
     93 __BIONIC_TERMIOS_INLINE int tcgetattr(int fd, struct termios* s) {
     94   return ioctl(fd, TCGETS, s);
     95 }
     96 
     97 __BIONIC_TERMIOS_INLINE pid_t tcgetsid(int fd) {
     98   pid_t sid;
     99   return (ioctl(fd, TIOCGSID, &sid) == -1) ? -1 : sid;
    100 }
    101 
    102 __BIONIC_TERMIOS_INLINE int tcsendbreak(int fd, int duration) {
    103   return ioctl(fd, TCSBRKP, __BIONIC_CAST(static_cast, unsigned long, duration));
    104 }
    105 
    106 __BIONIC_TERMIOS_INLINE int tcsetattr(int fd, int optional_actions, const struct termios* s) {
    107   int cmd;
    108   switch (optional_actions) {
    109     case TCSANOW: cmd = TCSETS; break;
    110     case TCSADRAIN: cmd = TCSETSW; break;
    111     case TCSAFLUSH: cmd = TCSETSF; break;
    112     default: errno = EINVAL; return -1;
    113   }
    114   return ioctl(fd, cmd, s);
    115 }
    116 
    117 __END_DECLS
    118 
    119 #endif
    120