root/trunk/src/msg_mgmt.c @ 32

/*
 * File: msg_mgmt.c
 * 
 * Authors: ANDREU Francois-Xavier 
 *
 * Copyright (C) 2005 2006 2007 GIP RENATER 
 */

/*  This file is part of renetcol. 
 *
 *  renetcol is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  renetcol is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with renetcol; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <syslog.h>

#include "msg_mgmt.h"

/*
 * createKey()
 */
key_t
createKey(char *argzero){
  key_t key;
  if ((key = ftok (argzero, 0)) == -1) {
    perror ("ftok");
    exit(-1);
  }
  return key;
}

/*
 * createQueue()
 */
int
createQueue(key_t key){
  int file;
  if ((file = msgget (key, IPC_CREAT | 0x660)) == -1) {
    perror ("msgget");
    exit(-1);
  }
  return file;
}

/*
 * msgSend()
 */
void
msgSend(int file, msgType msg){
  if (msgsnd (file, (void *) & msg, sizeof(msg.text), 
              IPC_NOWAIT) <0) {
    if (errno == EAGAIN) {
      syslog(LOG_INFO,"The IPC queue is full, I don't wait");
    } else {
      syslog(LOG_ERR,"msgsnd : %s", strerror(errno)); 
      exit(1);
    }
  }
}

/*
 * msgRcv()
 */
unsigned char *
msgRcv(int file, msgType *msg, long type)
{
  if (msgrcv (file, (void *) msg, sizeof(msg->text), type, 0) >= 0){
    return (unsigned char *)msg->text;
  } else if (errno == EINTR) {
    syslog(LOG_INFO,"msgrcv : Internal system call");
  } else {
    syslog (LOG_ERR,"msgrcv : %s", strerror(errno));
    exit(1);
  }
  return (unsigned char *)msg->text; /* FIXME return value if error ? */
}