unix - shared memory programme is not working in c -

there 2 programs there 1 call server put content in shared memory , other client received content shared memory both in both programs attached shared memory data 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 milap pancholi";     int i=0;     for(i=0;i<sizeof(c);i++)     {         printf("%c",c[i]);         data+=c[i];     }     printf("%s\n",ptr); } 

your main problem this:

data+=c[i]; 

this pointer arithmetic, advancing data, not want @ all. replace with:

data[i] = c[i]; 

other issues:

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