mirror of
https://github.com/tstack/lnav
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80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file termios_guard.hh
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*/
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#ifndef termios_guard_hh
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#define termios_guard_hh
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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/**
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* RAII class that saves the current termios for a tty and then restores them
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* during destruction.
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*/
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class guard_termios {
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public:
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/**
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* Store the TTY termios settings in this object.
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*
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* @param fd The tty file descriptor.
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*/
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guard_termios(const int fd) : gt_fd(fd)
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{
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memset(&this->gt_termios, 0, sizeof(this->gt_termios));
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if (isatty(this->gt_fd) &&
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tcgetattr(this->gt_fd, &this->gt_termios) == -1) {
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perror("tcgetattr");
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}
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};
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/**
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* Restore the TTY termios settings that were captured when this object was
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* instantiated.
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*/
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~guard_termios()
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{
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if (isatty(this->gt_fd) &&
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tcsetattr(this->gt_fd, TCSANOW, &this->gt_termios) == -1) {
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perror("tcsetattr");
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}
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};
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const struct termios *get_termios() const { return &this->gt_termios; };
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private:
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const int gt_fd;
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struct termios gt_termios;
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};
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#endif
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