sharedmemoryproducer.c

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <fcntl.h> 
#include <sys/shm.h> 
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>

int main()
{/* the size (in bytes) of shared memory object */ 
const int SIZE = 4096;
/* name of the shared memory object */
const char *name = "OS";
/* strings written to shared memory */ 
const char *message_0 = "Hello";
const char *message_1 = "World!";

/* shared memory file descriptor */ 
int shm_fd;
/* pointer to shared memory obect */ 
void *ptr;
/* create the shared memory object */
shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
/* configure the size of the shared memory object */ 
ftruncate(shm_fd, SIZE);
/* memory map the shared memory object */
ptr = mmap(0, SIZE, PROT_WRITE, MAP_SHARED, shm_fd, 0);

/* write to the shared memory object */ 
sprintf(ptr,"%s",message_0);
ptr += strlen(message_0); 
sprintf(ptr,"%s",message_1);
ptr += strlen(message_1); 
return 0;
}