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  1. #include <stdio.h>
  2. #include <sys/ipc.h>
  3. #include <sys/shm.h>
  4. #include <unistd.h>
  5. #include <string.h>
  6.  
  7. int main() {
  8.     int shmid;
  9.     key_t key = ftok("shmfile", 65);
  10.     char *str;
  11.  
  12.     // Create shared memory
  13.     shmid = shmget(key, 1024, 0666 | IPC_CREAT);
  14.  
  15.     // Attach shared memory
  16.     str = (char*) shmat(shmid, NULL, 0);
  17.  
  18.     if (fork() == 0) {
  19.         // Child Process (Reader)
  20.         sleep(1);  // wait for parent to write
  21.         printf("Child Process Reading Data:\n");
  22.         printf("Message: %s\n", str);
  23.  
  24.         // Detach
  25.         shmdt(str);
  26.     } else {
  27.         // Parent Process (Writer)
  28.         printf("Parent Process Writing Data:\n");
  29.         printf("Enter message: ");
  30.         fgets(str, 100, stdin);
  31.  
  32.         sleep(2);  // ensure child reads after write
  33.  
  34.         // Detach
  35.         shmdt(str);
  36.  
  37.         // Delete shared memory
  38.         shmctl(shmid, IPC_RMID, NULL);
  39.     }
  40.  
  41.     return 0;
  42. }
Sukces #stdin #stdout 0.01s 5304KB
comments (?)
stdin
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Standard input is empty
stdout
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Child Process Reading Data:
Message: 
Parent Process Writing Data:
Enter message:
https://ideone.com/vhg3rO
język:
C++ (gcc 8.3)
stworzono:
12 godzin temu
widoczność:
publiczne

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