Cloudhostica Tech Blog - Learn Programming, Tech Sories, unboxing

  C Program to show an example of Direct Communication # include <stdio.h> # include <unistd.h> # include <sys/types.h> # include <stdlib.h> # include <fcntl.h> # include <string.h> int main ( void ) { int fd [ 2 ] , nbytes ; pid_t childpid ; char string [ 40 ] ; char readbuffer [ 80 ] ; pipe ( fd ) ; if ( ( childpid = fork ( ) ) == - 1 ) { perror ( "fork" ) ; exit ( 1 ) ; } if ( childpid == 0 ) { printf ( "Enter message to send into the parent process:" ) ; scanf ( "%s" , string ) ; close ( fd [ 0 ] ) ; write ( fd [ 1 ] , string , ( strlen ( string ) + 1 ) ) ; exit ( 0 ) ; } else { close ( fd [ 1 ] ) ; nbytes = read ( fd [ 0 ] , readbuffer , sizeof ( readbuffer ) ) ; printf ( "Recieved message from the child process:%s" , readbuffer ) ; printf ( "\n" ) ; } return ( 0 ) ; }