[3138] | 1 | //libroaross.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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| 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | * NOTE for everyone want's to change something and send patches: |
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| 24 | * read README and HACKING! There a addition information on |
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| 25 | * the license of this document you need to read before you send |
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| 26 | * any patches. |
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| 27 | * |
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| 28 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 29 | * or libpulse*: |
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| 30 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 31 | * and are therefore GPL. Because of this it may be illigal to use |
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| 32 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 33 | */ |
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| 34 | |
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| 35 | #include "roaraudio.h" |
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| 36 | |
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| 37 | #if defined(ROAR_HAVE_OSS_BSD) || defined(ROAR_HAVE_OSS) |
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| 38 | #if defined(__OpenBSD__) || defined(__NetBSD__) |
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| 39 | #include <soundcard.h> |
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| 40 | #else |
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| 41 | #include <sys/soundcard.h> |
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| 42 | #endif |
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| 43 | #include <sys/ioctl.h> |
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| 44 | |
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| 45 | #ifdef ROAR_HAVE_H_SYS_TYPES |
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| 46 | #include <sys/types.h> |
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| 47 | #endif |
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| 48 | |
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| 49 | #ifdef ROAR_HAVE_H_FCNTL |
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| 50 | #include <fcntl.h> |
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| 51 | #endif |
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| 52 | |
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| 53 | #ifdef ROAR_HAVE_H_UNISTD |
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| 54 | #include <unistd.h> |
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| 55 | #endif |
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| 56 | |
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| 57 | #include <sys/stat.h> |
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[3139] | 58 | #include <dlfcn.h> |
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| 59 | |
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| 60 | #if defined(RTLD_NEXT) |
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| 61 | #define REAL_LIBC RTLD_NEXT |
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| 62 | #else |
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| 63 | #define REAL_LIBC ((void *) -1L) |
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| 64 | #endif |
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[3138] | 65 | |
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| 66 | #define _MAX_POINTER 8 |
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| 67 | |
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[3140] | 68 | // handle type: |
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| 69 | #define HT_NONE 0 |
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| 70 | #define HT_STREAM 1 |
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| 71 | #define HT_MIXER 2 |
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| 72 | |
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[3138] | 73 | struct session { |
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| 74 | int refc; |
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| 75 | struct roar_connection con; |
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| 76 | }; |
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| 77 | |
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| 78 | static struct session _session = {.refc = 0}; |
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| 79 | |
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| 80 | struct handle { |
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| 81 | int refc; // refrence counter |
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| 82 | struct session * session; |
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[3140] | 83 | int type; |
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| 84 | struct roar_stream stream; |
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| 85 | struct roar_vio_calls stream_vio; |
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| 86 | int stream_opened; |
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[3138] | 87 | }; |
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| 88 | |
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| 89 | static struct { |
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| 90 | int (*open)(const char *pathname, int flags, mode_t mode); |
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| 91 | int (*close)(int fd); |
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| 92 | ssize_t (*write)(int fd, const void *buf, size_t count); |
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| 93 | ssize_t (*read)(int fd, void *buf, size_t count); |
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| 94 | } _os; |
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| 95 | |
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[3140] | 96 | static struct pointer { |
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[3138] | 97 | int fh; |
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| 98 | struct handle * handle; |
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| 99 | } _ptr[_MAX_POINTER]; |
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| 100 | |
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| 101 | static void _init_os (void) { |
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| 102 | memset(&_os, 0, sizeof(_os)); |
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[3139] | 103 | |
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| 104 | _os.open = dlsym(REAL_LIBC, "open"); |
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| 105 | _os.close = dlsym(REAL_LIBC, "close"); |
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| 106 | _os.write = dlsym(REAL_LIBC, "write"); |
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| 107 | _os.read = dlsym(REAL_LIBC, "read"); |
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[3138] | 108 | } |
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| 109 | |
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| 110 | static void _init_ptr (void) { |
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| 111 | int i; |
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| 112 | |
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| 113 | for (i = 0; i < _MAX_POINTER; i++) { |
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| 114 | _ptr[i].fh = -1; |
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| 115 | } |
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| 116 | } |
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| 117 | |
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| 118 | static void _init (void) { |
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| 119 | static int inited = 0; |
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| 120 | |
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| 121 | if ( !inited ) { |
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| 122 | _init_os(); |
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| 123 | _init_ptr(); |
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| 124 | inited++; |
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| 125 | } |
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| 126 | } |
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| 127 | |
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| 128 | static int _open_dummy (void) { |
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| 129 | int p[2]; |
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| 130 | |
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| 131 | if ( pipe(p) == -1 ) |
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| 132 | return -1; |
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| 133 | |
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| 134 | close(p[1]); |
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| 135 | |
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| 136 | return p[0]; |
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| 137 | } |
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| 138 | |
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| 139 | static struct session * _open_session (char * server, char * name) { |
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| 140 | if ( _session.refc == 0 ) { |
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| 141 | |
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| 142 | if ( name == NULL ) |
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| 143 | name = "libroaross client"; |
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| 144 | |
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| 145 | if ( roar_simple_connect(&(_session.con), server, name) == -1 ) |
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| 146 | return NULL; |
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[3143] | 147 | } |
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[3138] | 148 | |
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[3143] | 149 | _session.refc++; |
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| 150 | return &_session; |
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[3138] | 151 | } |
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| 152 | |
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| 153 | static void _close_session(struct session * session) { |
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| 154 | if ( session == NULL ) |
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| 155 | return; |
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| 156 | |
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| 157 | session->refc--; |
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| 158 | |
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| 159 | if ( session->refc == 0 ) { |
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| 160 | roar_disconnect(&(session->con)); |
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| 161 | } |
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| 162 | } |
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| 163 | |
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[3140] | 164 | static struct handle * _open_handle(struct session * session) { |
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| 165 | struct handle * handle; |
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| 166 | |
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| 167 | if ( (handle = roar_mm_malloc(sizeof(struct handle))) == NULL ) |
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| 168 | return NULL; |
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| 169 | |
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| 170 | memset(handle, 0, sizeof(struct handle)); |
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| 171 | |
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| 172 | handle->refc = 1; |
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| 173 | handle->session = session; |
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| 174 | session->refc++; // TODO: better warp this |
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| 175 | handle->type = HT_NONE; |
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| 176 | roar_stream_new_empty(&(handle->stream)); |
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| 177 | |
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| 178 | return handle; |
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| 179 | } |
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| 180 | |
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| 181 | static void _close_handle(struct handle * handle) { |
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| 182 | if (handle == NULL) |
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| 183 | return; |
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| 184 | |
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| 185 | handle->refc--; |
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| 186 | |
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| 187 | if ( handle->refc == 0 ) { |
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| 188 | _close_session(handle->session); |
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| 189 | |
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| 190 | if ( handle->stream_opened ) |
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| 191 | roar_vio_close(&(handle->stream_vio)); |
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| 192 | |
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| 193 | roar_mm_free(handle); |
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| 194 | } |
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| 195 | } |
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| 196 | |
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| 197 | static int _open_stream (struct handle * handle) { |
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| 198 | return -1; |
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| 199 | } |
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| 200 | |
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| 201 | static struct pointer * _get_pointer_by_fh (int fh) { |
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| 202 | int i; |
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| 203 | |
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| 204 | for (i = 0; i < _MAX_POINTER; i++) { |
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| 205 | if ( _ptr[i].fh == fh ) |
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| 206 | return &(_ptr[i]); |
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| 207 | } |
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| 208 | |
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| 209 | return NULL; |
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| 210 | } |
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| 211 | |
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| 212 | static struct pointer * _open_pointer(struct handle * handle) { |
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| 213 | struct pointer * ret = _get_pointer_by_fh(-1); |
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| 214 | |
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| 215 | if ( ret == NULL ) |
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| 216 | return NULL; |
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| 217 | |
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| 218 | if ( (ret->fh = _open_dummy()) == -1 ) |
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| 219 | return NULL; |
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| 220 | |
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| 221 | ret->handle = handle; |
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| 222 | |
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| 223 | return ret; |
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| 224 | } |
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| 225 | |
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| 226 | static void _close_pointer(struct pointer * pointer) { |
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| 227 | if ( pointer == NULL ) |
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| 228 | return; |
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| 229 | |
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| 230 | _os.close(pointer->fh); |
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| 231 | |
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| 232 | pointer->fh = -1; |
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| 233 | |
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| 234 | _close_handle(pointer->handle); |
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| 235 | } |
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[3138] | 236 | |
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| 237 | // ------------------------------------- |
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[3142] | 238 | // central open function: |
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| 239 | // ------------------------------------- |
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| 240 | |
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| 241 | static int _open_file (const char *pathname, int flags) { |
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[3143] | 242 | struct session * session; |
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| 243 | struct handle * handle; |
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| 244 | struct pointer * pointer; |
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| 245 | struct { |
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| 246 | char * prefix; |
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| 247 | int type; |
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| 248 | } * ptr = NULL, p[] = { |
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| 249 | {"/dev/dsp", HT_STREAM}, |
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| 250 | {NULL, HT_NONE}, |
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| 251 | }; |
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| 252 | int i; |
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| 253 | |
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| 254 | for (i = 0; p[i].prefix != NULL; i++) { |
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| 255 | if ( !strcmp(pathname, p[i].prefix) ) { |
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| 256 | ptr = &(p[i]); |
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| 257 | } |
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| 258 | } |
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| 259 | |
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| 260 | if ( ptr == NULL ) |
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| 261 | return -2; |
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| 262 | |
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| 263 | _os.write(1, "DOOF!\n", 6); |
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| 264 | |
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| 265 | if ( (session = _open_session(NULL, NULL)) == NULL ) { |
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| 266 | return -1; |
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| 267 | } |
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| 268 | |
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| 269 | if ( (handle = _open_handle(session)) == NULL ) { |
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| 270 | _close_session(session); |
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| 271 | return -1; |
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| 272 | } |
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| 273 | |
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| 274 | handle->type = ptr->type; |
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| 275 | |
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| 276 | if ( (pointer = _open_pointer(handle)) == NULL ) { |
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| 277 | _close_handle(handle); |
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| 278 | return -1; |
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| 279 | } |
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| 280 | |
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| 281 | return pointer->fh; |
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[3142] | 282 | } |
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| 283 | |
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| 284 | // ------------------------------------- |
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[3138] | 285 | // emulated functions follow: |
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| 286 | // ------------------------------------- |
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| 287 | |
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| 288 | int open(const char *pathname, int flags, ...) { |
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[3142] | 289 | int ret; |
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| 290 | mode_t mode = 0; |
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[3138] | 291 | va_list args; |
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| 292 | |
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| 293 | _init(); |
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| 294 | |
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[3142] | 295 | ret = _open_file(pathname, flags); |
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| 296 | |
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| 297 | switch (ret) { |
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| 298 | case -2: // continue as normal, use _op.open() |
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| 299 | break; |
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| 300 | case -1: // pass error to caller |
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| 301 | return -1; |
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| 302 | break; |
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| 303 | default: // return successfully opened pointer to caller |
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| 304 | return ret; |
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| 305 | break; |
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| 306 | } |
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| 307 | |
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[3138] | 308 | if (flags & O_CREAT) { |
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| 309 | va_start(args, flags); |
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| 310 | mode = va_arg(args, mode_t); |
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| 311 | va_end(args); |
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| 312 | } |
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| 313 | |
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| 314 | return _os.open(pathname, flags, mode); |
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| 315 | } |
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| 316 | |
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| 317 | int close(int fd) { |
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[3140] | 318 | struct pointer * pointer; |
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[3138] | 319 | _init(); |
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| 320 | |
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[3140] | 321 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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| 322 | _close_pointer(pointer); |
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| 323 | return 0; |
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| 324 | } |
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| 325 | |
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[3138] | 326 | return _os.close(fd); |
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| 327 | } |
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| 328 | |
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| 329 | ssize_t write(int fd, const void *buf, size_t count) { |
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[3140] | 330 | struct pointer * pointer; |
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| 331 | |
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[3138] | 332 | _init(); |
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| 333 | |
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[3140] | 334 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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| 335 | if ( pointer->handle->type == HT_STREAM ) { |
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| 336 | if ( pointer->handle->stream_opened == 0 ) { |
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| 337 | if ( _open_stream(pointer->handle) == -1 ) { |
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| 338 | errno = EIO; |
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| 339 | return -1; |
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| 340 | } |
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| 341 | } |
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[3141] | 342 | return roar_vio_write(&(pointer->handle->stream_vio), (char*)buf, count); |
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[3140] | 343 | } else { |
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| 344 | errno = EINVAL; |
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| 345 | return -1; |
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| 346 | } |
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| 347 | } |
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| 348 | |
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[3138] | 349 | return _os.write(fd, buf, count); |
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| 350 | } |
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| 351 | |
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| 352 | ssize_t read(int fd, void *buf, size_t count) { |
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[3140] | 353 | struct pointer * pointer; |
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| 354 | |
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[3138] | 355 | _init(); |
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| 356 | |
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[3140] | 357 | if ( (pointer = _get_pointer_by_fh(fd)) != NULL ) { |
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| 358 | if ( pointer->handle->type == HT_STREAM ) { |
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| 359 | if ( pointer->handle->stream_opened == 0 ) { |
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| 360 | if ( _open_stream(pointer->handle) == -1 ) { |
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| 361 | errno = EIO; |
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| 362 | return -1; |
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| 363 | } |
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| 364 | } |
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| 365 | return roar_vio_read(&(pointer->handle->stream_vio), buf, count); |
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| 366 | } else { |
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| 367 | errno = EINVAL; |
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| 368 | return -1; |
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| 369 | } |
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| 370 | } |
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| 371 | |
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[3138] | 372 | return _os.read(fd, buf, count); |
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| 373 | } |
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| 374 | |
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| 375 | #endif |
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| 376 | |
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| 377 | //ll |
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