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  1.  
  2. #include <stdio.h>
  3. #include <unistd.h>
  4. #include <sys/shm.h>
  5. #include <sys/ipc.h>
  6. #include <string.h>
  7.  
  8.  
  9. int main()
  10. {
  11.     int shmid;
  12.     char *shared_memory;
  13.     char buff[100];
  14.  
  15.  
  16.     shmid = shmget((key_t)2345, 1024, 0666 | IPC_CREAT);
  17.  
  18.  
  19.     if (shmid == -1) {
  20.         perror("shmget failed");
  21.         return 1;
  22.     }
  23.  
  24.  
  25.     printf("Key of shared memory is %d\n", shmid);
  26.  
  27.  
  28.     shared_memory = (char *)shmat(shmid, NULL, 0);
  29.  
  30.  
  31.     if (shared_memory == (char *)-1) {
  32.         perror("shmat failed");
  33.         return 1;
  34.     }
  35.  
  36.  
  37.     printf("Enter some data to write to shared memory: ");
  38.     read(0, buff, 100);
  39.  
  40.  
  41.     strcpy(shared_memory, buff);
  42.  
  43.  
  44.     printf("You wrote: %s\n", shared_memory);
  45.  
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin
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Standard input is empty
stdout
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Key of shared memory is 0
Enter some data to write to shared memory: You wrote:
https://ideone.com/loj8mc
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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