kopia lustrzana https://github.com/Hamlib/Hamlib
112 wiersze
2.7 KiB
C++
112 wiersze
2.7 KiB
C++
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/* -*-C++-*-
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*******************************************************************************
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*
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* File: givelp1.cc
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* Description: give a program direct access to LPT1 io ports
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*
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*******************************************************************************
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*/
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/*
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* Copyright 2001,2002 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <sys/io.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdio.h>
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// which is 0, 1 or 2 to specify lp0, lp1 or lp2
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const static int parallel_port_base[3] = {
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0x3bc, // lp0 used to be on monochome display adapter
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0x378, // lp1 most common
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0x278 // lp2 secondary
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};
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/*!
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* \brief enable direct parallel port io access from user land.
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* \p is in [0,2] and specifies which parallel port to access.
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*
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* \returns -1 on error, else base ioport address
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*/
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int
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enable_parallel_ioport_access (int which)
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{
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errno = 0;
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if (which < 0 || which >= 3)
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return -1;
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if (ioperm (parallel_port_base[which], 3, 1) < 0)
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return -1;
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return parallel_port_base[which];
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}
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bool
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reset_eids ()
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{
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if (setgid (getgid ()) < 0){
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perror ("setguid");
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return false;
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}
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if (setuid (getuid ()) < 0){
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perror ("setuid");
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return false;
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}
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return true;
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}
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int main (int argc, char **argv)
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{
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if (argc < 2){
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fprintf (stderr, "usage: givelp1 program-to-run [arg...]\n");
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exit (2);
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}
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if (enable_parallel_ioport_access (1) == -1){
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if (errno != 0){
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perror ("ioperm");
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fprintf (stderr, "givelp1 must be setuid root to use ioperm system call\n");
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fprintf (stderr, "Running as root, please execute: \n");
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fprintf (stderr, " # chown root givelp1\n");
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fprintf (stderr, " # chmod u+s givelp1\n");
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exit (1);
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}
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}
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if (!reset_eids ()){
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fprintf (stderr, "Can't drop root permissions\n");
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exit (3);
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}
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// if successful, no return
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execvp (argv[1], argv+1);
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perror (argv[1]);
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exit (4);
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}
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