26 lines
661 B
C
26 lines
661 B
C
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
|
|
int main() {
|
|
char parent_message[] = "hello";
|
|
char child_message[] = "goodbye";
|
|
|
|
void* shmem = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
|
|
|
|
memcpy(shmem, parent_message, sizeof(parent_message));
|
|
|
|
int pid = fork();
|
|
if (pid == 0) {
|
|
printf("Child read: %s\n", (char*)shmem);
|
|
memcpy(shmem, child_message, sizeof(child_message));
|
|
printf("Child wrote: %s\n", (char*)shmem);
|
|
} else {
|
|
printf("Parent read: %s\n", (char*)shmem);
|
|
sleep(1);
|
|
printf("After 1s, parent read: %s\n", (char*)shmem);
|
|
}
|
|
}
|