Advanced C++ and Software Engineering Interview Questions: Beyond The Invisible by Gleamixie

Author:Gleamixie
Language: eng
Format: epub
Published: 2025-02-16T00:00:00+00:00

In this example, the parent process creates a pipe and then forks a child process. The parent writes the string “Hello Child” to the pipe, and the child reads this string from the pipe and writes it to stdout. The pipe is unidirectional , so data written by the parent is read by the child.

​2. ​ Named Pipes (FIFOs)

Named pipes, also known as FIFOs, are similar to unnamed pipes but have a name in the file system. They allow bidirectional communication between processes and can be used for IPC between unrelated processes.

This example includes two programs, one that writes to the pipe first and then reads from it, and another that reads from the pipe first and then writes to it.

Program 1 | Writes First | program1.cpp

#include <fcntl.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

#include <string.h>

#include <stdio.h>

int main () {

int fd;

const char * m_fifo = "/tmp/myfifo" ;

mkfifo ( m_fifo , 0666 ) ;

char w_data [ 80 ] , r_data [ 80 ] ;

while ( 1 ) {

fd = open ( m_fifo , O_WRONLY ) ;

fgets ( w_data , 80 , stdin) ;

write ( fd, w_data, strlen ( w_data ) + 1 ) ;

close ( fd ) ;

fd = open ( m_fifo , O_RDONLY ) ;

read ( fd, r_data, sizeof ( r_data )) ;

printf ( "Process-2: %s
" , r_data ) ;

close ( fd ) ;

}

return 0 ;

}

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