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[RaspberryPi] Chatting Program using Shared Memory Flag 본문

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[RaspberryPi] Chatting Program using Shared Memory Flag

hyeok0724.kim@gmail.com 2019. 5. 6. 21:26
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[EcoServerBySharedMemory.c]

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#include <stdio.h>
#include <stdlib.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
 
#define SHARED_MEMORY_KEY 1111
#define MEMORY_SIZE 1024
 
#define READ_CLIENT_FLAG 0
#define READ_SERVER_FLAG 1
#define PRINT_CLIENT_FLAG 2
 
int main()
{
    int shmid;
    char *buffer;
    char *string;
    
    //make space that shared-memory
    shmid = shmget((key_t)SHARED_MEMORY_KEY, MEMORY_SIZE, 0666|IPC_CREAT);
    
    if(shmid == -1)
    {
        perror("shmget failed: ");
        exit(0);
    }
    
    //attach shared memory
    buffer = shmat(shmid, (void *)0, 0);
    
    if(buffer == (void *)-1)
    {
        perror("shmat failed:");
        exit(0);
    }
    string = buffer + 1;
    
    buffer[0] = READ_CLIENT_FLAG;
    
    while(1)
    {
        if(buffer[0] == READ_SERVER_FLAG)
        {
            puts(string);
            strcat(string, "by server");
            buffer[0] = PRINT_CLIENT_FLAG;
        }
        sleep(1);
    }
}
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[EcoClientBySharedMemory.c]

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#include <stdio.h>
#include <stdlib.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
 
#define SHARED_MEMORY_KEY 1111
#define MEMORY_SIZE 1024
 
#define READ_CLIENT_FLAG 0
#define READ_SERVER_FLAG 1
#define PRINT_CLIENT_FLAG 2
 
int main()
{
    int shmid;
    char *buffer;
    char *string;
    
    //make space that shared-memory
    shmid = shmget((key_t)SHARED_MEMORY_KEY, MEMORY_SIZE, 0666 | IPC_CREAT);
    if(shmid == -1)
    {
        perror("shmget failed: ");
        exit(0);
    }
    
    //attach shared memory
    buffer = shmat(shmid, NULL, 0);
    if(buffer == (void *)-1)
    {
        perror("shmat failed: ");
        exit(0);
    }
    
    buffer[0] = READ_CLIENT_FLAG;
    string = buffer + 1;
    
    while(1)
    {
        if(buffer[0] == READ_CLIENT_FLAG)
        {
            printf("message : ");
            scanf("%s", string);
            
            buffer[0] = READ_SERVER_FLAG;
        }
        else if(buffer[0] == PRINT_CLIENT_FLAG)
        {
            puts(string);
            buffer[0] = READ_CLIENT_FLAG;
        }
        sleep(1);
    }
}    
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