/*******************************************************************************/
/* 	jg151.cc -- Generating message queues * 
 *      Message queue generation
 *	John Gray, Inrerprocess Communications in UNIX,  P.151
 */
#include 	<stdio.h>
#include	<sys/types.h>
#include	<sys/msg.h>
#include	<sys/ipc.h>
#include	<unistd.h>
#include	<stdlib.h>
#include	<limits.h>
#define MAX	5
int main(void){
  FILE	*fin;
  char	buffer[PIPE_BUF], u_char = 'A';
  int	i, n, mid[MAX];
  key_t	key;
  for(i=0; i < MAX; ++i, ++u_char){
    //key = ftok(".", u_char);
    key = getuid()+i;
    if((mid[i] = msgget(key, IPC_CREAT | 0660)) == -1){
      perror("Queue creat");
      exit(1);
     }
  }
  fin = popen("ipcs", "r");   /* run the ipcs command*/
  while((n=read(fileno(fin), buffer, PIPE_BUF)) > 0)
    write(fileno(stdout), buffer, n);   /* display ipcs output */
  pclose(fin);

  for(i=0; i<MAX; ++i)
    msgctl(mid[i], IPC_RMID, (struct msqid_ds *) 0); /* remove*/
  exit(0);
}