mdw@git.distorted.org.uk Git - disorder/blob - lib/speaker-protocol.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2005, 2007 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20 /** @file lib/speaker-protocol.c
  21  * @brief Speaker/server protocol support
  22  */
  23
  24 #include "common.h"
  25
  26 #include <sys/socket.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stddef.h>
  30
  31 #include "speaker-protocol.h"
  32 #include "log.h"
  33
  34 /** @brief Send a speaker message
  35  * @param fd File descriptor to send to
  36  * @param sm Pointer to message
  37  */
  38 void speaker_send(int fd, const struct speaker_message *sm) {
  39   int ret;
  40
  41   do {
  42     ret = write(fd, sm, sizeof *sm);
  43   } while(ret < 0 && errno == EINTR);
  44   if(ret < 0)
  45     fatal(errno, "write");
  46 }
  47
  48 /** @brief Receive a speaker message
  49  * @param fd File descriptor to read from
  50  * @param sm Where to store received message
  51  * @return -ve on @c EAGAIN, 0 at EOF, +ve on success
  52  */
  53 int speaker_recv(int fd, struct speaker_message *sm) {
  54   int ret;
  55
  56   do {
  57     ret = read(fd, sm, sizeof *sm);
  58   } while(ret < 0 && errno == EINTR);
  59   if(ret < 0) {
  60     if(errno != EAGAIN) fatal(errno, "recvmsg");
  61     return -1;
  62   }
  63   return ret;
  64 }
  65
  66 /*
  67 Local Variables:
  68 c-basic-offset:2
  69 comment-column:40
  70 fill-column:79
  71 indent-tabs-mode:nil
  72 End:
  73 */