Question

how to send string from process to shared memory using c language?

Answer 1

//writer process
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>

int main()
{
  
key_t k = ftok("shmfile",65); //ftok to generate unique key

int shmid = shmget(k,1024,0666|IPC_CREAT);
char *str = (char*) shmat(shmid,(void*)0,0);

printf("Write Data : ");
gets(str);
printf("Data written in memory: %s\n",str);
shmdt(str);
}

//reader process

#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>

  
int main()
{
key_t key = ftok("shmfile",65);
int shmid = shmget(key,1024,0666|IPC_CREAT);
char *str = (char*) shmat(shmid,(void*)0,0);

printf("Data read from memory: %s\n",str);
shmdt(str);
shmctl(shmid,IPC_RMID,NULL);

return 0;
}