dabba/ipc.c

   1 /* __LICENSE_HEADER_BEGIN__ */
   2
   3 /*
   4  * Copyright (C) 2012   Emmanuel Roullit <emmanuel.roullit@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  */
  21
  22 /* __LICENSE_HEADER_END__ */
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <assert.h>
  28 #include <errno.h>
  29 #include <dabba/ipc.h>
  30
  31 int dabba_ipc_msg(struct dabba_ipc_msg *msg)
  32 {
  33         int qid;
  34         ssize_t rcv;
  35         int snd;
  36
  37         assert(msg);
  38
  39         qid = dabba_get_ipc_queue_id(0660);
  40
  41         if (qid < 0) {
  42                 perror("Cannot get IPC id");
  43                 return errno;
  44         }
  45
  46         snd = msgsnd(qid, msg, sizeof(msg->msg_body), 0);
  47
  48         if (snd < 0) {
  49                 perror("Error while sending IPC msg");
  50                 return errno;
  51         }
  52
  53         usleep(100);
  54
  55         rcv = msgrcv(qid, msg, sizeof(msg->msg_body), 0, 0);
  56
  57         if (rcv <= 0) {
  58                 perror("Error while receiving IPC msg");
  59                 return errno;
  60         }
  61
  62         if (msg->msg_body.error != 0) {
  63                 printf("The daemon reported: %s\n",
  64                        strerror(msg->msg_body.error));
  65                 return msg->msg_body.error;
  66         }
  67
  68         return 0;
  69 }