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116 changes: 110 additions & 6 deletions README.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# Linux-IPC-Shared-memory
# EX: 06 - Linux-IPC-Shared-memory
Ex06-Linux IPC-Shared-memory

# AIM:
Expand All @@ -21,13 +21,117 @@ Execute the C Program for the desired output.
# PROGRAM:

## Write a C program that illustrates two processes communicating using shared memory.
```
//shm.c

#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<sys/shm.h>
#define TEXT_SZ 2048
struct shared_use_st{
int written_by_you;
char some_text[TEXT_SZ];
};
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);
printf("Shared memort id = %d \n",shmid);
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 Attached 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(strncmp(buffer, "end", 3) == 0){
running = 0;}}
if (shmdt(shared_memory) == -1)
{
fprintf(stderr, "shmdt failed\n"); exit(EXIT_FAILURE);
} exit(EXIT_SUCCESS);
}



//shmry2.c

#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<sys/shm.h>
#define TEXT_SZ 2048
struct shared_use_st{
int written_by_you;
char some_text[TEXT_SZ];
};
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);
printf("Shared memort id = %d \n",shmid);
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 Attached 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(strncmp(buffer, "end", 3) == 0){
running = 0;}}
if (shmdt(shared_memory) == -1)
{
fprintf(stderr, "shmdt failed\n"); exit(EXIT_FAILURE);
} exit(EXIT_SUCCESS);
}



```


## OUTPUT:
![Screenshot 2024-04-29 101323](https://github.com/ANU23000217/Linux-IPC-Shared-memory/assets/139117108/086b13f2-7b78-412d-89ff-5a3098320e4b)


![Screenshot 2024-04-29 101334](https://github.com/ANU23000217/Linux-IPC-Shared-memory/assets/139117108/69c1f297-b189-4689-8c7f-1a46e4331d5f)





## OUTPUT


# RESULT:
The program is executed successfully.