5da96467a9
...and fix the bugs. Also explain why we can't support separate input and output speeds without an ABI change. Luckily no-one is likely to need that anyway, and they can always work around it by using `struct termios2` directly themselves. Bug: http://b/69816452 Test: ran tests Change-Id: Ie08499a198bb6a20d7e5e2f5ff74a60bd53e97e1
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _BITS_TERMIOS_INLINES_H_
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#define _BITS_TERMIOS_INLINES_H_
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#include <errno.h>
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#include <sys/cdefs.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <linux/termios.h>
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#if !defined(__BIONIC_TERMIOS_INLINE)
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#define __BIONIC_TERMIOS_INLINE static __inline
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#endif
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__BEGIN_DECLS
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// Supporting separate input and output speeds would require an ABI
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// change for `struct termios`.
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static __inline speed_t cfgetspeed(const struct termios* s) {
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return __BIONIC_CAST(static_cast, speed_t, s->c_cflag & CBAUD);
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}
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__BIONIC_TERMIOS_INLINE speed_t cfgetispeed(const struct termios* s) {
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return cfgetspeed(s);
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}
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__BIONIC_TERMIOS_INLINE speed_t cfgetospeed(const struct termios* s) {
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return cfgetspeed(s);
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}
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__BIONIC_TERMIOS_INLINE void cfmakeraw(struct termios* s) {
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s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
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s->c_oflag &= ~OPOST;
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s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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s->c_cflag &= ~(CSIZE|PARENB);
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s->c_cflag |= CS8;
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s->c_cc[VMIN] = 1;
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s->c_cc[VTIME] = 0;
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}
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__BIONIC_TERMIOS_INLINE int cfsetspeed(struct termios* s, speed_t speed) {
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// CBAUD is 0x100f, and every matching bit pattern has a Bxxx constant.
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if ((speed & ~CBAUD) != 0) {
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errno = EINVAL;
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return -1;
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}
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s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
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return 0;
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}
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__BIONIC_TERMIOS_INLINE int cfsetispeed(struct termios* s, speed_t speed) {
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return cfsetspeed(s, speed);
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}
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__BIONIC_TERMIOS_INLINE int cfsetospeed(struct termios* s, speed_t speed) {
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return cfsetspeed(s, speed);
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}
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__BIONIC_TERMIOS_INLINE int tcdrain(int fd) {
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// A non-zero argument to TCSBRK means "don't send a break".
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// The drain is a side-effect of the ioctl!
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return ioctl(fd, TCSBRK, __BIONIC_CAST(static_cast, unsigned long, 1));
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}
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__BIONIC_TERMIOS_INLINE int tcflow(int fd, int action) {
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return ioctl(fd, TCXONC, __BIONIC_CAST(static_cast, unsigned long, action));
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}
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__BIONIC_TERMIOS_INLINE int tcflush(int fd, int queue) {
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return ioctl(fd, TCFLSH, __BIONIC_CAST(static_cast, unsigned long, queue));
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}
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__BIONIC_TERMIOS_INLINE int tcgetattr(int fd, struct termios* s) {
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return ioctl(fd, TCGETS, s);
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}
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__BIONIC_TERMIOS_INLINE pid_t tcgetsid(int fd) {
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pid_t sid;
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return (ioctl(fd, TIOCGSID, &sid) == -1) ? -1 : sid;
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}
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__BIONIC_TERMIOS_INLINE int tcsendbreak(int fd, int duration) {
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return ioctl(fd, TCSBRKP, __BIONIC_CAST(static_cast, unsigned long, duration));
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}
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__BIONIC_TERMIOS_INLINE int tcsetattr(int fd, int optional_actions, const struct termios* s) {
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int cmd;
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switch (optional_actions) {
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case TCSANOW: cmd = TCSETS; break;
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case TCSADRAIN: cmd = TCSETSW; break;
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case TCSAFLUSH: cmd = TCSETSF; break;
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default: errno = EINVAL; return -1;
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}
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return ioctl(fd, cmd, s);
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}
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__END_DECLS
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#endif
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