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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 // Supporting separate input and output speeds would require an ABI
     46 // change for `struct termios`.
     47 
     48 static __inline speed_t cfgetspeed(const struct termios* s) {
     49   return __BIONIC_CAST(static_cast, speed_t, s->c_cflag & CBAUD);
     50 }
     51 
     52 __BIONIC_TERMIOS_INLINE speed_t cfgetispeed(const struct termios* s) {
     53   return cfgetspeed(s);
     54 }
     55 
     56 __BIONIC_TERMIOS_INLINE speed_t cfgetospeed(const struct termios* s) {
     57   return cfgetspeed(s);
     58 }
     59 
     60 __BIONIC_TERMIOS_INLINE void cfmakeraw(struct termios* s) {
     61   s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
     62   s->c_oflag &= ~OPOST;
     63   s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
     64   s->c_cflag &= ~(CSIZE|PARENB);
     65   s->c_cflag |= CS8;
     66   s->c_cc[VMIN] = 1;
     67   s->c_cc[VTIME] = 0;
     68 }
     69 
     70 __BIONIC_TERMIOS_INLINE int cfsetspeed(struct termios* s, speed_t speed) {
     71   // CBAUD is 0x100f, and every matching bit pattern has a Bxxx constant.
     72   if ((speed & ~CBAUD) != 0) {
     73     errno = EINVAL;
     74     return -1;
     75   }
     76   s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
     77   return 0;
     78 }
     79 
     80 __BIONIC_TERMIOS_INLINE int cfsetispeed(struct termios* s, speed_t speed) {
     81   return cfsetspeed(s, speed);
     82 }
     83 
     84 __BIONIC_TERMIOS_INLINE int cfsetospeed(struct termios* s, speed_t speed) {
     85   return cfsetspeed(s, speed);
     86 }
     87 
     88 __BIONIC_TERMIOS_INLINE int tcdrain(int fd) {
     89   // A non-zero argument to TCSBRK means "don't send a break".
     90   // The drain is a side-effect of the ioctl!
     91   return ioctl(fd, TCSBRK, __BIONIC_CAST(static_cast, unsigned long, 1));
     92 }
     93 
     94 __BIONIC_TERMIOS_INLINE int tcflow(int fd, int action) {
     95   return ioctl(fd, TCXONC, __BIONIC_CAST(static_cast, unsigned long, action));
     96 }
     97 
     98 __BIONIC_TERMIOS_INLINE int tcflush(int fd, int queue) {
     99   return ioctl(fd, TCFLSH, __BIONIC_CAST(static_cast, unsigned long, queue));
    100 }
    101 
    102 __BIONIC_TERMIOS_INLINE int tcgetattr(int fd, struct termios* s) {
    103   return ioctl(fd, TCGETS, s);
    104 }
    105 
    106 __BIONIC_TERMIOS_INLINE pid_t tcgetsid(int fd) {
    107   pid_t sid;
    108   return (ioctl(fd, TIOCGSID, &sid) == -1) ? -1 : sid;
    109 }
    110 
    111 __BIONIC_TERMIOS_INLINE int tcsendbreak(int fd, int duration) {
    112   return ioctl(fd, TCSBRKP, __BIONIC_CAST(static_cast, unsigned long, duration));
    113 }
    114 
    115 __BIONIC_TERMIOS_INLINE int tcsetattr(int fd, int optional_actions, const struct termios* s) {
    116   int cmd;
    117   switch (optional_actions) {
    118     case TCSANOW: cmd = TCSETS; break;
    119     case TCSADRAIN: cmd = TCSETSW; break;
    120     case TCSAFLUSH: cmd = TCSETSF; break;
    121     default: errno = EINVAL; return -1;
    122   }
    123   return ioctl(fd, cmd, s);
    124 }
    125 
    126 __END_DECLS
    127 
    128 #endif
    129