* Filename: logserver.c */ /******************************************************************************************* modify this program to log the message from clients to a log file.
/* Filename: logserver.c */
/*******************************************************************************************
modify this program to log the message from clients to a log file.
******************************************************************************************/
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<string.h>
#include<errno.h>
#include<stdlib.h>
#define BUF_SIZE 1024
#define SHM_KEY 0x1234
struct shmseg {
int cnt;
int new;
int complete;
char buf[BUF_SIZE];
};
int main(int argc, char *argv[]) {
int shmid;
struct shmseg *shmp;
shmid = shmget(SHM_KEY, sizeof(struct shmseg), 0666|IPC_CREAT);
if (shmid == -1) {
perror("Shared memory");
return 1;
}
// Attach to the segment to get a pointer to it.
shmp = shmat(shmid, NULL, 0);
if (shmp == (void *) -1) {
perror("Shared memory attach");
return 1;
}
/* Transfer blocks of data from shared memory to log file
if the message from client set shmp->complete ==1, the we log server will end its operation
if the message from the client is new, then the message should be log in the log file
*/
while(shmp->complete != 1)
{
while (shmp->new == 1) {
// after the message send to file, put the shmp->new to false
shmp->new = 0;
}
}
/*************************************************************
write the code to detach the share memory from the process
*******************************************************/
/*********************************************************
write the code to mark the shared memory to be destroyed
*********************************************************/
return 0;
}
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