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

   1 /*
   2  *
   3  *  BlueZ - Bluetooth protocol stack for Linux
   4  *
   5  *  Copyright (C) 2004-2008  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 /* This table contains the string representation for messages */
  26 static const char *strmsg[] = {
  27         "BT_GETCAPABILITIES_REQ",
  28         "BT_GETCAPABILITIES_RSP",
  29         "BT_SETCONFIGURATION_REQ",
  30         "BT_SETCONFIGURATION_RSP",
  31         "BT_STREAMSTART_REQ",
  32         "BT_STREAMSTART_RSP",
  33         "BT_STREAMSTOP_REQ",
  34         "BT_STREAMSTOP_RSP",
  35         "BT_STREAMSUSPEND_IND",
  36         "BT_STREAMRESUME_IND",
  37         "BT_CONTROL_REQ",
  38         "BT_CONTROL_RSP",
  39         "BT_CONTROL_IND",
  40         "BT_STREAMFD_IND",
  41 };
  42
  43 int bt_audio_service_open(void)
  44 {
  45         int sk;
  46         int err;
  47         struct sockaddr_un addr = {
  48                 AF_UNIX, BT_IPC_SOCKET_NAME
  49         };
  50
  51         sk = socket(PF_LOCAL, SOCK_STREAM, 0);
  52         if (sk < 0) {
  53                 err = errno;
  54                 fprintf(stderr, "%s: Cannot open socket: %s (%d)\n",
  55                         __FUNCTION__, strerror(err), err);
  56                 errno = err;
  57                 return -1;
  58         }
  59
  60         if (connect(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  61                 err = errno;
  62                 fprintf(stderr, "%s: connect() failed: %s (%d)\n",
  63                         __FUNCTION__, strerror(err), err);
  64                 close(sk);
  65                 errno = err;
  66                 return -1;
  67         }
  68
  69         return sk;
  70 }
  71
  72 int bt_audio_service_close(int sk)
  73 {
  74         return close(sk);
  75 }
  76
  77 int bt_audio_service_get_data_fd(int sk)
  78 {
  79         char cmsg_b[CMSG_SPACE(sizeof(int))], m;
  80         int err, ret;
  81         struct iovec iov = { &m, sizeof(m) };
  82         struct msghdr msgh;
  83         struct cmsghdr *cmsg;
  84
  85         memset(&msgh, 0, sizeof(msgh));
  86         msgh.msg_iov = &iov;
  87         msgh.msg_iovlen = 1;
  88         msgh.msg_control = &cmsg_b;
  89         msgh.msg_controllen = CMSG_LEN(sizeof(int));
  90
  91         ret = (int) recvmsg(sk, &msgh, 0);
  92         if (ret < 0) {
  93                 err = errno;
  94                 fprintf(stderr, "%s: Unable to receive fd: %s (%d)\n",
  95                         __FUNCTION__, strerror(err), err);
  96                 errno = err;
  97                 return -1;
  98         }
  99
 100         /* Receive auxiliary data in msgh */
 101         for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
 102                         cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
 103                 if (cmsg->cmsg_level == SOL_SOCKET
 104                                 && cmsg->cmsg_type == SCM_RIGHTS)
 105                         return (*(int *) CMSG_DATA(cmsg));
 106         }
 107
 108         errno = EINVAL;
 109         return -1;
 110 }
 111
 112 const char *bt_audio_strmsg(int type)
 113 {
 114     if (type < 0 || (size_t) type > (sizeof(strmsg) / sizeof(strmsg[0])))
 115                 return NULL;
 116
 117         return strmsg[type];
 118 }