Initial Spring 2016 commit.
This commit is contained in:
Geoffrey Challen
238
userland/lib/hostcompat/hostcompat.c
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238
userland/lib/hostcompat/hostcompat.c
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/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University 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 UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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#include <unistd.h>
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#include <termios.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "hostcompat.h"
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/*
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* The program name.
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* This is used in err.c.
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*/
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const char *hostcompat_progname = NULL;
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/*
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* Unix tty state, for when we're running and to put it back the way it was,
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* respectively.
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*/
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static struct termios hostcompat_runtios;
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static struct termios hostcompat_savetios;
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/*
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* Put the tty state back the way it was.
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*/
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static
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void
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hostcompat_ttyreset(void)
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{
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tcsetattr(STDIN_FILENO, TCSADRAIN, &hostcompat_savetios);
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}
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/*
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* Set the tty state back to the way we want it for running.
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*/
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static
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void
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hostcompat_ttyresume(void)
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{
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tcsetattr(STDIN_FILENO, TCSADRAIN, &hostcompat_runtios);
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}
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/*
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* Set up the tty state stuff.
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*/
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static
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int
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hostcompat_ttysetup(void)
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{
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struct termios tios;
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/* Get the current tty state. */
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if (tcgetattr(STDIN_FILENO, &tios) < 0) {
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/* stdin is not a tty */
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return -1;
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}
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hostcompat_savetios = tios;
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/* Turn off canonical ("cooked") input. */
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tios.c_lflag &= ~ICANON;
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/*
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* With canonical input off, this says how many characters must be
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* typed before read() will return.
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*/
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tios.c_cc[VMIN] = 1;
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/* This can be used to set up read timeouts, but we don't need that. */
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tios.c_cc[VTIME] = 0;
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/* Turn off echoing of keypresses. */
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tios.c_lflag &= ~(ECHO|ECHONL|ECHOCTL);
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/* Do not support XON/XOFF flow control. */
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tios.c_iflag &= ~(IXON|IXOFF);
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/* On input, we want no CR/LF translation. */
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tios.c_iflag &= ~(INLCR|IGNCR|ICRNL);
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/* However, on output we want LF ('\n') mapped to CRLF. */
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#ifdef OCRNL /* missing on OS X */
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tios.c_oflag &= ~(OCRNL);
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#endif
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tios.c_oflag |= OPOST|ONLCR;
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/* Enable keyboard signals (^C, ^Z, etc.) because they're useful. */
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tios.c_lflag |= ISIG;
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/* Set the new tty state. */
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hostcompat_runtios = tios;
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tcsetattr(STDIN_FILENO, TCSADRAIN, &tios);
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return 0;
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}
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/*
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* Signal handler for all the fatal signals (SIGSEGV, SIGTERM, etc.)
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*/
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static
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void
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hostcompat_die(int sig)
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{
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/* Set the tty back to the way we found it */
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hostcompat_ttyreset();
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/* Make sure the default action will occur when we get another signal*/
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signal(sig, SIG_DFL);
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/* Post the signal back to ourselves, to cause the right exit status.*/
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kill(getpid(), sig);
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/* Just in case. */
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_exit(255);
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}
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/*
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* Signal handler for the stop signals (SIGTSTP, SIGTTIN, etc.)
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*/
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static
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void
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hostcompat_stop(int sig)
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{
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/* Set the tty back to the way we found it */
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hostcompat_ttyreset();
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/* Make sure the default action will occur when we get another signal*/
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signal(sig, SIG_DFL);
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/* Post the signal back to ourselves. */
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kill(getpid(), sig);
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}
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/*
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* Signal handler for SIGCONT.
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*/
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static
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void
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hostcompat_cont(int sig)
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{
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(void)sig;
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/* Set the tty to the way we want it for running. */
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hostcompat_ttyresume();
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/*
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* Reload the signal handlers for stop/continue signals, in case
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* they were set up with one-shot signals.
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*/
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signal(SIGTTIN, hostcompat_stop);
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signal(SIGTTOU, hostcompat_stop);
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signal(SIGTSTP, hostcompat_stop);
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signal(SIGCONT, hostcompat_cont);
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}
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/*
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* Initialize the hostcompat library.
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*/
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void
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hostcompat_init(int argc, char *argv[])
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{
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/* Set the program name */
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if (argc > 0 && argv[0] != NULL) {
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hostcompat_progname = argv[0];
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}
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/* Set the tty modes */
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if (hostcompat_ttysetup() < 0) {
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return;
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}
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/* When exit() is called, clean up */
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atexit(hostcompat_ttyreset);
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/* stdout/stderr should be unbuffered */
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setvbuf(stdout, NULL, _IONBF, 0);
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setvbuf(stderr, NULL, _IONBF, 0);
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/* Catch all the fatal signals, so we can clean up */
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signal(SIGHUP, hostcompat_die);
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signal(SIGINT, hostcompat_die);
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signal(SIGQUIT, hostcompat_die);
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signal(SIGILL, hostcompat_die);
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signal(SIGTRAP, hostcompat_die);
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signal(SIGABRT, hostcompat_die);
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#ifdef SIGEMT
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signal(SIGEMT, hostcompat_die);
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#endif
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signal(SIGFPE, hostcompat_die);
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signal(SIGBUS, hostcompat_die);
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signal(SIGSEGV, hostcompat_die);
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signal(SIGSYS, hostcompat_die);
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signal(SIGPIPE, hostcompat_die);
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signal(SIGALRM, hostcompat_die);
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signal(SIGTERM, hostcompat_die);
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signal(SIGXCPU, hostcompat_die);
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signal(SIGXFSZ, hostcompat_die);
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signal(SIGVTALRM, hostcompat_die);
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signal(SIGPROF, hostcompat_die);
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signal(SIGUSR1, hostcompat_die);
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signal(SIGUSR2, hostcompat_die);
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/* Catch the stop signals, so we can adjust the tty */
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signal(SIGTTIN, hostcompat_stop);
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signal(SIGTTOU, hostcompat_stop);
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signal(SIGTSTP, hostcompat_stop);
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/* Catch the continue signal, so we can adjust the tty */
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signal(SIGCONT, hostcompat_cont);
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}
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