odczytuje

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
   #define MAX 10

   main(){
	int shmid, i;
	char *buf;
        char napis[10];
	const char *a = "aaaaa";
	const char *b = "bbbbb";
	shmid = shmget(45281, MAX*sizeof(int), IPC_CREAT|0600);

	if (shmid == -1){
		exit(1);
 	}

	buf = (char*)shmat(shmid, NULL, 0);
	if (buf == NULL){
		exit(1);
	}
	while(1)
	{
	strcpy(napis,buf);
	if(0==strcmp(napis,a))
		printf("a\n");
	if(0==strcmp(napis,b))
		printf("b\n");
	putchar('\n');
	}
   }