socket-samples

Socket programming examples in strict C90 and modern Python3.

Build & Run C90 Examples

make clean && make all

Builds 9 binaries in build/ (strict -std=c90 -pedantic -Wall -Wextra -Werror).

Port: 9999

All use the same custom binary protocol:

• Header: 1-byte type + 2-byte BE16 length
• Types: PING(0x01), PONG(0x02), METRIC_REQ(0x03), METRIC_RESP(0x04), SUBSCRIBE(0x05), PUSH(0x06), UNSUB(0x07), ERROR(0xFF)
• Metrics: cpu, memory, disk, loadavg, uptime (simulated)

C90 Clients

• src/c90/metric_client.c: Basic interactive TCP client (ping/get/quit).
• src/c90/metric_client_ansi.c: Advanced TCP client w/ select() + unsubscribe.
• src/c90/metric_client_sub.c: TCP client w/ live subscribe/push via select().
• src/c90/metric_client_udp.c: Full-featured UDP client (get/sub/unsub).
• src/c90/perf_client_udp.c: UDP perf tester (--flood or subscribe mode, 30s throughput).

C90 Servers

• src/c90/metric_server.c: Iterative TCP server (single client).
• src/c90/metric_server_fork.c: Forking TCP server (multi-client).
• src/c90/metric_server_fork_sub.c: Forking TCP server w/ subscribe/push.
• src/c90/metric_server_udp.c: UDP server w/ subscriber management (select()).

Python Examples

Run: python3 src/python/{file}.py [host [port]]

Port: 9999 (metrics), 65432 (echo)

Echo (text protocol)

• src/python/echo_client.py: Interactive TCP echo client.
• src/python/echo_server.py: Iterative TCP echo server.

Metrics (same binary protocol as C90)

• src/python/metric_client.py: Threaded TCP client (ping/get).
• src/python/metric_server.py: Threaded multi-client TCP server.

Monitor (advanced w/ subscribe/push)

• src/python/mon_client.py: Full TCP client (ping/get/sub).
• src/python/mon_server.py: Threaded TCP server w/ subscribe/push support.