Client-Server

VK internship assignment

Simple server for receiving files from multiple clients and client for sending files

Features

• pure C11
• multithreading with pthreads for receiving multiple files in parallel
• the fastest way of IO multiplexing - using epoll
• memory-mapped file IO to omit allocation of buffers
• comprehensible error messages

Usage

Server:

Server [port] [saving_dir]

Default port and directory for files are 1026 and /tmp (can be reconfigured)

Client:

Client <address:port> <path_to_file> [name_on_server]

Default name_on_server is same as the original filename

Configuration

The following constants can be set in server_conf.h before compilation:

• BACKLOG - queue size for accepting connections, other ones likely to be rejected
• MAX_EVENTS - maximum number of file descriptors returned by epoll_wait
• TIMEOUT - epoll_wait timeout
• NUM_THREADS - number of additional threads besides main
• 'DEFAULT_PORT'
• 'DEFAULT_PATH'

Compilation

Via cmake

Tested with modern gcc, language standard is C11