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 3 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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU 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, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/speaker-protocol.c
  19  * @brief Speaker/server protocol support
  20  */
  21
  22 #include "common.h"
  23
  24 #include <sys/socket.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <stddef.h>
  28
  29 #include "speaker-protocol.h"
  30 #include "log.h"
  31
  32 /** @brief Send a speaker message
  33  * @param fd File descriptor to send to
  34  * @param sm Pointer to message
  35  */
  36 void speaker_send(int fd, const struct speaker_message *sm) {
  37   int ret;
  38
  39   do {
  40     ret = write(fd, sm, sizeof *sm);
  41   } while(ret < 0 && errno == EINTR);
  42   if(ret < 0)
  43     disorder_fatal(errno, "write");
  44 }
  45
  46 /** @brief Receive a speaker message
  47  * @param fd File descriptor to read from
  48  * @param sm Where to store received message
  49  * @return -ve on @c EAGAIN, 0 at EOF, +ve on success
  50  */
  51 int speaker_recv(int fd, struct speaker_message *sm) {
  52   int ret;
  53
  54   do {
  55     ret = read(fd, sm, sizeof *sm);
  56   } while(ret < 0 && errno == EINTR);
  57   if(ret < 0) {
  58     if(errno != EAGAIN)
  59       disorder_fatal(errno, "recvmsg");
  60     return -1;
  61   }
  62   return ret;
  63 }
  64
  65 /*
  66 Local Variables:
  67 c-basic-offset:2
  68 comment-column:40
  69 fill-column:79
  70 indent-tabs-mode:nil
  71 End:
  72 */