code.delx.au - pulseaudio/blob - src/modules/bluetooth/ipc.c

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2.1 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22
  23 #include "ipc.h"
  24
  25 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  26
  27 /* This table contains the string representation for messages types */
  28 static const char *strtypes[] = {
  29         "BT_REQUEST",
  30         "BT_RESPONSE",
  31         "BT_INDICATION",
  32         "BT_ERROR",
  33 };
  34
  35 /* This table contains the string representation for messages names */
  36 static const char *strnames[] = {
  37         "BT_GET_CAPABILITIES",
  38         "BT_OPEN",
  39         "BT_SET_CONFIGURATION",
  40         "BT_NEW_STREAM",
  41         "BT_START_STREAM",
  42         "BT_STOP_STREAM",
  43         "BT_SUSPEND_STREAM",
  44         "BT_RESUME_STREAM",
  45         "BT_CONTROL",
  46 };
  47
  48 int bt_audio_service_open(void)
  49 {
  50         int sk;
  51         int err;
  52         struct sockaddr_un addr = {
  53                 AF_UNIX, BT_IPC_SOCKET_NAME
  54         };
  55
  56         sk = socket(PF_LOCAL, SOCK_STREAM, 0);
  57         if (sk < 0) {
  58                 err = errno;
  59                 fprintf(stderr, "%s: Cannot open socket: %s (%d)\n",
  60                         __FUNCTION__, strerror(err), err);
  61                 errno = err;
  62                 return -1;
  63         }
  64
  65         if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  66                 err = errno;
  67                 fprintf(stderr, "%s: connect() failed: %s (%d)\n",
  68                         __FUNCTION__, strerror(err), err);
  69                 close(sk);
  70                 errno = err;
  71                 return -1;
  72         }
  73
  74         return sk;
  75 }
  76
  77 int bt_audio_service_close(int sk)
  78 {
  79         return close(sk);
  80 }
  81
  82 int bt_audio_service_get_data_fd(int sk)
  83 {
  84         char cmsg_b[CMSG_SPACE(sizeof(int))], m;
  85         int err, ret;
  86         struct iovec iov = { &m, sizeof(m) };
  87         struct msghdr msgh;
  88         struct cmsghdr *cmsg;
  89
  90         memset(&msgh, 0, sizeof(msgh));
  91         msgh.msg_iov = &iov;
  92         msgh.msg_iovlen = 1;
  93         msgh.msg_control = &cmsg_b;
  94         msgh.msg_controllen = CMSG_LEN(sizeof(int));
  95
  96         ret = recvmsg(sk, &msgh, 0);
  97         if (ret < 0) {
  98                 err = errno;
  99                 fprintf(stderr, "%s: Unable to receive fd: %s (%d)\n",
 100                         __FUNCTION__, strerror(err), err);
 101                 errno = err;
 102                 return -1;
 103         }
 104
 105         /* Receive auxiliary data in msgh */
 106         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 107                         cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 108                 if (cmsg->cmsg_level == SOL_SOCKET
 109                                 && cmsg->cmsg_type == SCM_RIGHTS) {
 110                         memcpy(&ret, CMSG_DATA(cmsg), sizeof(int));
 111                         return ret;
 112                 }
 113         }
 114
 115         errno = EINVAL;
 116         return -1;
 117 }
 118
 119 const char *bt_audio_strtype(uint8_t type)
 120 {
 121         if (type >= ARRAY_SIZE(strtypes))
 122                 return NULL;
 123
 124         return strtypes[type];
 125 }
 126
 127 const char *bt_audio_strname(uint8_t name)
 128 {
 129         if (name >= ARRAY_SIZE(strnames))
 130                 return NULL;
 131
 132         return strnames[name];
 133 }