/*
  NAME: 		shmreaderOffLine
  SYNOPSIS: 	shmreaderOffLine < inputfile of two lines 
  DESCRIPTION:  
  This program communicate with another program 
  (shmwriter) using shared memory.
	This program reads two lines the stdin into memory buffers and at the
	same time	or later, shmwriter writes the buffers into stdout.
  
*/

#include "def.h"

BUFFER  *buf[2];
int	shmid[2];

main()
{
    int i;
/*
  creat the shared memory segments and attach them
*/
    for (i = 0; i < 2; i++) {
        if ( (shmid[i] = shmget(SHMKEY + i, sizeof(BUFFER),
                                PERMS | IPC_CREAT)) < 0)
            printf("server: can't get shared memory %d", i);
        if ( (buf[i] = (BUFFER *) shmat(shmid[i], (char *) 0, 0))
             == (BUFFER *) -1)
            printf("server: can't attach shared memory %d", i);
    }
/*
  read two lines from stdin and write to memory
*/
    buf[0]->size = read(0, buf[0]->data, BSIZE);
    buf[1]->size = read(0, buf[1]->data, BSIZE);
/*
  detach this shared memory and close the semaphores.
  the other program (shmwriter) is the last one to use
  the shared memory, so it'll remove it when it's done
*/
    for (i = 0; i < 2; i++) {
        if (shmdt((void *) buf[i]) < 0)
            printf("server: can't detach shared memory ");
    }
    exit(0);
}