#include<unistd.h>#include<stdlib.h>#include<stdio.h>#include<string.h>#include<sys/types.h>#include<sys/ipc.h>#include<sys/shm.h>#include "shm_com.h"int main(){    int running = -1;    void *shared_memory = (void *)0;    struct shared_use_st *shared_stuff;    char buffer[BUFSIZ];    int shmid;       shmid = shmget((key_t)1234,sizeof(struct shared_use_st),0666|IPC_CREAT);    if(shmid == -1) {        fprintf(stderr,"shmget failed\n");        exit(EXIT_FAILURE);    }    shared_memory = shmat(shmid,(void *)0,0);    if(shared_memory==(void *)-1) {        fprintf(stderr,"shmat failed\n");        exit(EXIT_FAILURE);    }    printf("Memory attched at %X\n",(int)shared_memory);        shared_stuff = (struct shared_use_st *)shared_memory;    while(running) {        while(shared_stuff->written_by_you ==1) {            sleep(1);            printf("waiting for client...\n");        }        printf("Enter some text: ");        fgets(buffer,BUFSIZ,stdin);                strncpy(shared_stuff->some_text,buffer,TEXT_SZ);        shared_stuff->written_by_you=1;        if(strncpy(buffer,"end",3)==0) {              running=0;        }    }    if(shmdt(shared_memory)==-1) {        fprintf(stderr,"shmdt failure\n");        exit(EXIT_FAILURE);    }    exit(EXIT_SUCCESS);}