shared memory programme is not working in c

Question

There are two programs are there one is call server which put content in shared memory and other is client which received a content from shared memory both in both programs it is attached successfully with shared memory but data is not display in client side.

Client.c

#include<fcntl.h> #include<sys/ipc.h> #include<sys/shm.h> void main(int argc,char * argv[]) { int shmid=shmget(124,70,0777); char * data; printf("%d\n",shmid); data=shmat(shmid,0,0); printf("%s",data); }

Server.c

#include<fcntl.h> #include<sys/ipc.h> #include<sys/shm.h> void main(int argc,char * argv[]) { int shmid=shmget(124,70,0777|IPC_CREAT); char * data,*ptr; printf("%d\n",shmid); if((data=shmat(shmid,0,0))==(char *)-1); { printf("No attach\n"); } ptr=data; memset(data,0,1024); printf("%s",data); char c[]="My name is milap pancholi"; int i=0; for(i=0;i<sizeof(c);i++) { printf("%c",c[i]); data+=c[i]; } printf("%s\n",ptr); }

Mat · Accepted Answer · 2015-04-25 10:34:33Z

Your main problem is this:

data+=c[i];

This does pointer arithmetic, advancing data, not what you want at all. Replace it with:

data[i] = c[i];

Other issues:

main returns int, not void. Use int main() { ... } if you don't need the arguments count and values (to avoid warnings, which you should turn way up).
You're missing #include <stdio.h> for printf
You're missing #include <string.h> for memset

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