[490] | 1 | /* libcqcam - shared Color Quickcam routines |
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| 2 | * Copyright (C) 1996-1998 by Patrick Reynolds |
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| 3 | * Email: <no.email@noemail.com> |
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| 4 | * |
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| 5 | * This library is free software; you can redistribute it and/or |
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| 6 | * modify it under the terms of the GNU Library General Public |
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| 7 | * License as published by the Free Software Foundation; either |
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| 8 | * version 2 of the License, or (at your option) any later version. |
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| 9 | * |
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| 10 | * This library is distributed in the hope that it will be useful, |
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | * Library General Public License for more details. |
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| 14 | * |
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| 15 | * You should have received a copy of the GNU Library General Public |
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| 16 | * License along with this library; if not, write to the |
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| 17 | * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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| 18 | * Boston, MA 02110-1301, USA. |
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| 19 | */ |
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| 20 | |
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| 21 | // I/O ports wrapper code |
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| 22 | // This file might need tweaking if you're trying to port my code to other |
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| 23 | // x86 Unix platforms. Code is already available for Linux, FreeBSD, and |
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| 24 | // QNX; see the Makefile. |
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| 25 | // |
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| 26 | // QNX code by: Anders Arpteg <aa11ac@hik.se> |
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| 27 | // FreeBSD code by: Patrick Reynolds <reynolds@cs.duke.edu> and Charles |
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| 28 | // Henrich <henrich@msu.edu> |
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| 29 | |
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| 30 | |
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| 31 | //#include "config.h" |
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| 32 | |
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| 33 | #include <stdio.h> |
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| 34 | #include <errno.h> |
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| 35 | |
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| 36 | #ifdef LOCKING |
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| 37 | #include <fcntl.h> |
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| 38 | #include <sys/stat.h> |
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| 39 | #endif /* LOCKING */ |
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| 40 | |
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| 41 | #ifdef __linux__ |
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| 42 | #if defined(arm) || defined(__hppa__) || defined(__sparc__) || defined(__ppc__) || defined(__powerpc__) || defined(__s390__) || defined(__s390x__) || defined(__mips__) || defined(__mc68000__) |
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| 43 | #include <fcntl.h> |
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| 44 | #else |
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| 45 | #include <sys/io.h> |
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| 46 | #endif /* arm */ |
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| 47 | #elif defined(QNX) |
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| 48 | #include <conio.h> |
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| 49 | #elif defined(__FreeBSD__) |
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| 50 | #include <sys/types.h> |
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| 51 | #include <machine/cpufunc.h> |
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| 52 | #elif defined(BSDI) |
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| 53 | #include <machine/inline.h> |
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| 54 | #elif defined(OPENBSD) |
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| 55 | #include <machine/pio.h> |
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| 56 | #elif defined(LYNX) |
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| 57 | #include "lynx-io.h" |
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| 58 | #elif defined(SOLARIS) |
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| 59 | #include "solaris-io.h" |
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| 60 | #else |
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| 61 | #error Please define a platform in the Makefile |
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| 62 | #endif /* which OS */ |
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| 63 | |
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| 64 | #include "port.h" |
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| 65 | |
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| 66 | port_t::port_t(int iport) { |
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| 67 | port = -1; |
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| 68 | |
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| 69 | #ifdef LOCKING |
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| 70 | if (lock(iport) == -1) { |
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| 71 | #ifdef DEBUG |
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| 72 | fprintf(stderr, "port 0x%x already locked\n", iport); |
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| 73 | #endif /* DEBUG */ |
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| 74 | return; |
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| 75 | } |
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| 76 | #endif /* LOCKING */ |
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| 77 | |
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| 78 | #ifdef LINUX |
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| 79 | #if defined(arm) || defined(__hppa__) || defined(__sparc__) || defined(__ppc__) || defined(__powerpc__) || defined(__s390__) || defined(__s390x__) || defined(__mips__) || defined(__mc68000__) |
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| 80 | if ((devport = open("/dev/port", O_RDWR)) < 0) { |
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| 81 | perror("open /dev/port"); |
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| 82 | return; |
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| 83 | } |
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| 84 | #else |
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| 85 | if (ioperm(iport, 3, 1) == -1) { |
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| 86 | perror("ioperm()"); |
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| 87 | return; |
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| 88 | } |
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| 89 | #endif /* arm */ |
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| 90 | #elif defined(FREEBSD) |
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| 91 | if ((devio = fopen("/dev/io", "r+")) == NULL) { |
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| 92 | perror("fopen /dev/io"); |
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| 93 | return; |
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| 94 | } |
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| 95 | #elif defined(OPENBSD) |
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| 96 | if (i386_iopl(1) == -1) { |
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| 97 | perror("i386_iopl"); |
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| 98 | return; |
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| 99 | } |
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| 100 | #elif defined(LYNX) |
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| 101 | if (io_access() < 0) { |
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| 102 | perror("io_access"); |
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| 103 | return; |
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| 104 | } |
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| 105 | #elif defined(SOLARIS) |
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| 106 | if (openiop()) { |
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| 107 | perror("openiop"); |
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| 108 | return; |
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| 109 | } |
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| 110 | #endif /* which OS */ |
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| 111 | |
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| 112 | port = iport; |
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| 113 | port1 = port + 1; |
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| 114 | port2 = port + 2; |
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| 115 | control_reg = read_control(); |
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| 116 | } |
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| 117 | |
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| 118 | port_t::~port_t(void) { |
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| 119 | #ifdef LOCKING |
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| 120 | unlock(port); |
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| 121 | #endif /* LOCKING */ |
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| 122 | #ifdef LINUX |
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| 123 | #if defined(arm) || defined(__hppa__) || defined(__sparc__) || defined(__ppc__) || defined(__powerpc__) || defined(__s390__) || defined(__s390x__) || defined(__mips__) || defined(__mc68000__) |
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| 124 | if (devport >= 0) |
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| 125 | close(devport); |
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| 126 | #else |
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| 127 | if (port > 0 && geteuid() == 0) |
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| 128 | if (ioperm(port, 3, 0) != 0) // drop port permissions -- still must |
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| 129 | // be root |
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| 130 | perror("ioperm()"); |
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| 131 | #endif /* arm */ |
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| 132 | #elif defined(FREEBSD) |
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| 133 | if (devio != NULL) |
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| 134 | fclose(devio); |
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| 135 | #elif defined(SOLARIS) |
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| 136 | close(iopfd); |
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| 137 | #endif /* which OS */ |
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| 138 | } |
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| 139 | |
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| 140 | #ifdef LOCKING |
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| 141 | int port_t::lock(int portnum) { |
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| 142 | char lockfile[80]; |
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| 143 | sprintf(lockfile, "/tmp/LOCK.qcam.0x%x", portnum); |
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| 144 | while ((lock_fd = open(lockfile, O_WRONLY | O_CREAT | O_EXCL, 0600)) == -1) { |
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| 145 | if (errno != EEXIST) { |
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| 146 | perror(lockfile); |
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| 147 | return -1; |
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| 148 | } |
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| 149 | struct stat stat_buf; |
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| 150 | if (lstat(lockfile, &stat_buf) < 0) continue; |
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| 151 | if (S_ISLNK(stat_buf.st_mode) || stat_buf.st_uid != 0) { |
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| 152 | if (unlink(lockfile)) { |
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| 153 | if (errno == ENOENT) continue; |
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| 154 | if (errno != EISDIR || (rmdir(lockfile) && errno != ENOENT)) { |
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| 155 | /* known problem: if lockfile exists and is a non-empty |
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| 156 | directory, we give up instead of doing an rm-r of it */ |
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| 157 | perror(lockfile); |
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| 158 | return -1; |
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| 159 | } |
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| 160 | } |
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| 161 | continue; |
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| 162 | } |
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| 163 | lock_fd = open(lockfile, O_WRONLY, 0600); |
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| 164 | if (lock_fd == -1) { |
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| 165 | perror(lockfile); |
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| 166 | return -1; |
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| 167 | } |
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| 168 | break; |
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| 169 | } |
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| 170 | |
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| 171 | static struct flock lock_info; |
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| 172 | lock_info.l_type = F_WRLCK; |
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| 173 | #ifdef LOCK_FAIL |
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| 174 | if (fcntl(lock_fd, F_SETLK, &lock_info) != 0) { |
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| 175 | #else |
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| 176 | if (fcntl(lock_fd, F_SETLKW, &lock_info) != 0) { |
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| 177 | #endif /* LOCK_FAIL */ |
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| 178 | if (errno != EAGAIN) |
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| 179 | perror("fcntl"); |
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| 180 | return -1; |
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| 181 | } |
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| 182 | chown(lockfile, getuid(), getgid()); |
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| 183 | #ifdef DEBUG |
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| 184 | fprintf(stderr, "Locked port 0x%x\n", portnum); |
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| 185 | #endif /* DEBUG */ |
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| 186 | return 0; |
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| 187 | } |
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| 188 | |
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| 189 | void port_t::unlock(int portnum) { |
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| 190 | if (portnum == -1) |
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| 191 | return; |
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| 192 | close(lock_fd); // this clears the lock |
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| 193 | char lockfile[80]; |
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| 194 | sprintf(lockfile, "/tmp/LOCK.qcam.0x%x", portnum); |
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| 195 | if (unlink(lockfile)) perror(lockfile); |
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| 196 | #ifdef DEBUG |
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| 197 | fprintf(stderr, "Unlocked port 0x%x\n", portnum); |
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| 198 | #endif /* DEBUG */ |
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| 199 | } |
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| 200 | #endif /* LOCKING */ |
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