fork download 
  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<unistd.h>
  4. #include<sys/wait.h>
  5.  
  6. #define BUFFER_SIZE 256
  7.  
  8. int main() {
  9.     int pipefd[2];
  10.     pid_t pid;
  11.     char buffer[BUFFER_SIZE];
  12.     int nbytes;
  13.  
  14.     // Create pipe
  15.     if (pipe(pipefd) == -1) {
  16.         perror("pipe");
  17.         exit(EXIT_FAILURE);
  18.     }
  19.  
  20.     // Fork a child process
  21.     pid = fork();
  22.  
  23.     if (pid == -1) {
  24.         perror("fork");
  25.         exit(EXIT_FAILURE);
  26.     }
  27.  
  28.     if (pid == 0) {  // Child process
  29.         // Close the write end of the pipe
  30.         close(pipefd[1]);
  31.  
  32.         // Read from the pipe
  33.         nbytes = read(pipefd[0], buffer, BUFFER_SIZE);
  34.         if (nbytes == -1) {
  35.             perror("read");
  36.             exit(EXIT_FAILURE);
  37.         }
  38.  
  39.         printf("Child received message: %s", buffer);
  40.  
  41.         // Close the read end of the pipe
  42.         close(pipefd[0]);
  43.         exit(EXIT_SUCCESS);
  44.     } else {  // Parent process
  45.         // Close the read end of the pipe
  46.         close(pipefd[0]);
  47.  
  48.         // Write to the pipe
  49.         printf("Enter message to send to child: ");
  50.         fgets(buffer, BUFFER_SIZE, stdin);
  51.         write(pipefd[1], buffer, BUFFER_SIZE);
  52.  
  53.         // Close the write end of the pipe
  54.         close(pipefd[1]);
  55.  
  56.         // Wait for the child to finish
  57.         wait(NULL);
  58.         exit(EXIT_SUCCESS);
  59.     }
  60.  
  61.     return 0;
  62. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
Standard input is empty
stdout 
Child received message: Enter message to send to child:
https://ideone.com/7viu4U
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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