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/* libcqcam - shared Color Quickcam routines
* Copyright (C) 1996-1998 by Patrick Reynolds
* Email: <no.email@noemail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
// I/O ports wrapper code
// This file might need tweaking if you're trying to port my code to other
// x86 Unix platforms. Code is already available for Linux, FreeBSD, and
// QNX; see the Makefile.
//
// QNX code by: Anders Arpteg <aa11ac@hik.se>
// FreeBSD code by: Patrick Reynolds <reynolds@cs.duke.edu> and Charles
// Henrich <henrich@msu.edu>
//#include "config.h"
#include <stdio.h>
#include <errno.h>
#ifdef LOCKING
#include <fcntl.h>
#include <sys/stat.h>
#endif /* LOCKING */
#ifdef __linux__
#if defined(arm) || defined(__hppa__) || defined(__sparc__) || defined(__ppc__) \
|| defined(__powerpc__) || defined(__s390__) || defined(__s390x__)\
|| defined(__mips__) || defined(__mc68000__) || defined(__sh__)
#define NO_SYSIO
#endif /* architechtures */
#endif /* __linux__ */
#ifdef __linux__
#if defined(NO_SYSIO)
#include <fcntl.h>
#else
#include <sys/io.h>
#endif /* NO_SYSIO */
#elif defined(QNX)
#include <conio.h>
#elif defined(__FreeBSD__)
#include <sys/types.h>
#include <machine/cpufunc.h>
#elif defined(BSDI)
#include <machine/inline.h>
#elif defined(OPENBSD)
#include <machine/pio.h>
#elif defined(LYNX)
#include "lynx-io.h"
#elif defined(SOLARIS)
#include "solaris-io.h"
#else
#error Please define a platform in the Makefile
#endif /* which OS */
#include "port.h"
port_t::port_t(int iport) {
port = -1;
#ifdef LOCKING
if (lock(iport) == -1) {
#ifdef DEBUG
fprintf(stderr, "port 0x%x already locked\n", iport);
#endif /* DEBUG */
return;
}
#endif /* LOCKING */
#ifdef LINUX
#ifdef NO_SYSIO
if ((devport = open("/dev/port", O_RDWR)) < 0) {
perror("open /dev/port");
return;
}
#else
if (ioperm(iport, 3, 1) == -1) {
perror("ioperm()");
return;
}
#endif /* NO_SYSIO */
#elif defined(FREEBSD)
if ((devio = fopen("/dev/io", "r+")) == NULL) {
perror("fopen /dev/io");
return;
}
#elif defined(OPENBSD)
if (i386_iopl(1) == -1) {
perror("i386_iopl");
return;
}
#elif defined(LYNX)
if (io_access() < 0) {
perror("io_access");
return;
}
#elif defined(SOLARIS)
if (openiop()) {
perror("openiop");
return;
}
#endif /* which OS */
port = iport;
port1 = port + 1;
port2 = port + 2;
control_reg = read_control();
}
port_t::~port_t(void) {
#ifdef LOCKING
unlock(port);
#endif /* LOCKING */
#ifdef LINUX
#ifdef NO_SYSIO
if (devport >= 0)
close(devport);
#else
if (port > 0 && geteuid() == 0)
if (ioperm(port, 3, 0) != 0) // drop port permissions -- still must
// be root
perror("ioperm()");
#endif /* NO_SYSIO */
#elif defined(FREEBSD)
if (devio != NULL)
fclose(devio);
#elif defined(SOLARIS)
close(iopfd);
#endif /* which OS */
}
#ifdef LOCKING
int port_t::lock(int portnum) {
char lockfile[80];
sprintf(lockfile, "/tmp/LOCK.qcam.0x%x", portnum);
while ((lock_fd = open(lockfile, O_WRONLY | O_CREAT | O_EXCL, 0600)) == -1) {
if (errno != EEXIST) {
perror(lockfile);
return -1;
}
struct stat stat_buf;
if (lstat(lockfile, &stat_buf) < 0) continue;
if (S_ISLNK(stat_buf.st_mode) || stat_buf.st_uid != 0) {
if (unlink(lockfile)) {
if (errno == ENOENT) continue;
if (errno != EISDIR || (rmdir(lockfile) && errno != ENOENT)) {
/* known problem: if lockfile exists and is a non-empty
directory, we give up instead of doing an rm-r of it */
perror(lockfile);
return -1;
}
}
continue;
}
lock_fd = open(lockfile, O_WRONLY, 0600);
if (lock_fd == -1) {
perror(lockfile);
return -1;
}
break;
}
static struct flock lock_info;
lock_info.l_type = F_WRLCK;
#ifdef LOCK_FAIL
if (fcntl(lock_fd, F_SETLK, &lock_info) != 0) {
#else
if (fcntl(lock_fd, F_SETLKW, &lock_info) != 0) {
#endif /* LOCK_FAIL */
if (errno != EAGAIN)
perror("fcntl");
return -1;
}
chown(lockfile, getuid(), getgid());
#ifdef DEBUG
fprintf(stderr, "Locked port 0x%x\n", portnum);
#endif /* DEBUG */
return 0;
}
void port_t::unlock(int portnum) {
if (portnum == -1)
return;
close(lock_fd); // this clears the lock
char lockfile[80];
sprintf(lockfile, "/tmp/LOCK.qcam.0x%x", portnum);
if (unlink(lockfile)) perror(lockfile);
#ifdef DEBUG
fprintf(stderr, "Unlocked port 0x%x\n", portnum);
#endif /* DEBUG */
}
#endif /* LOCKING */
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