How do I install the Socket Programming skill?

Run npx skillmds add majiayu000/socket-programming-2 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Socket Programming safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: docs only. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Socket Programming?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Socket Programming free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Socket Programming?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Socket Programming by majiayu000 — Agent Skill

Name: Socket Programming
Rating: 4.2 (5 reviews)
Author: majiayu000

File contents

Socket Programming for Games

Master low-level socket programming for custom game networking.

Socket Types

Type	Protocol	Use Case
SOCK_STREAM	TCP	Reliable data
SOCK_DGRAM	UDP	Real-time
SOCK_RAW	Raw IP	Custom protocols

BSD Socket (C)

#include <sys/socket.h>
#include <netinet/in.h>

int create_game_server(int port) {
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    struct sockaddr_in addr = {
        .sin_family = AF_INET,
        .sin_port = htons(port),
        .sin_addr.s_addr = INADDR_ANY
    };

    bind(sockfd, (struct sockaddr*)&addr, sizeof(addr));
    fcntl(sockfd, F_SETFL, O_NONBLOCK);

    return sockfd;
}

Socket Options

// Disable Nagle (reduce latency)
int flag = 1;
setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));

// Enable address reuse
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));

// Set buffer size
int bufsize = 65536;
setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize));

Byte Order

// Network byte order
uint16_t port_net = htons(8080);
uint32_t ip_net = htonl(ip_host);

// Host byte order
uint16_t port_host = ntohs(port_net);

Platform Differences

Feature	BSD	Winsock
Init	None	WSAStartup()
Close	close()	closesocket()
Error	errno	WSAGetLastError()
Non-block	fcntl()	ioctlsocket()

Troubleshooting

Common Failure Modes

Error	Root Cause	Solution
EADDRINUSE	Port in use	SO_REUSEADDR
ECONNRESET	Peer closed	Handle gracefully
EMFILE	Too many fds	Increase ulimit
High latency	Nagle	TCP_NODELAY

Debug Checklist

# Check listening sockets
netstat -tlnp | grep game-server

# Trace syscalls
strace -e socket,bind,connect ./game-server

# Monitor traffic
tcpdump -i lo port 8080

Unit Test Template

void test_socket_creation() {
    int fd = create_game_server(8080);
    assert(fd >= 0);

    struct sockaddr_in addr;
    socklen_t len = sizeof(addr);
    getsockname(fd, (struct sockaddr*)&addr, &len);
    assert(ntohs(addr.sin_port) == 8080);

    close(fd);
}

Resources

assets/ - Socket templates
references/ - Platform guides

---name: socket-programming-2description: Low-level socket programming including BSD sockets, Winsock, and network byte manipulation--- # Socket Programming for Games Master **low-level socket programming** for custom game networking. ## Socket Types | Type | Protocol | Use Case | |------|----------|----------| | SOCK_STREAM | TCP | Reliable data | | SOCK_DGRAM | UDP | Real-time | | SOCK_RAW | Raw IP | Custom protocols | ## BSD Socket (C) ```c #include <sys/socket.h> #include <netinet/in.h> int create_game_server(int port) { int sockfd = socket(AF_INET, SOCK_DGRAM, 0); struct sockaddr_in addr = { .sin_family = AF_INET, .sin_port = htons(port), .sin_addr.s_addr = INADDR_ANY }; bind(sockfd, (struct sockaddr*)&addr, sizeof(addr)); fcntl(sockfd, F_SETFL, O_NONBLOCK); return sockfd; } ``` ## Socket Options ```c // Disable Nagle (reduce latency) int flag = 1; setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag)); // Enable address reuse setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag)); // Set buffer size int bufsize = 65536; setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &bufsize, sizeof(bufsize)); ``` ## Byte Order ```c // Network byte order uint16_t port_net = htons(8080); uint32_t ip_net = htonl(ip_host); // Host byte order uint16_t port_host = ntohs(port_net); ``` ## Platform Differences | Feature | BSD | Winsock | |---------|-----|---------| | Init | None | WSAStartup() | | Close | close() | closesocket() | | Error | errno | WSAGetLastError() | | Non-block | fcntl() | ioctlsocket() | ## Troubleshooting ### Common Failure Modes | Error | Root Cause | Solution | |-------|------------|----------| | EADDRINUSE | Port in use | SO_REUSEADDR | | ECONNRESET | Peer closed | Handle gracefully | | EMFILE | Too many fds | Increase ulimit | | High latency | Nagle | TCP_NODELAY | ### Debug Checklist ```bash # Check listening sockets netstat -tlnp | grep game-server # Trace syscalls strace -e socket,bind,connect ./game-server # Monitor traffic tcpdump -i lo port 8080 ``` ## Unit Test Template ```c void test_socket_creation() { int fd = create_game_server(8080); assert(fd >= 0); struct sockaddr_in addr; socklen_t len = sizeof(addr); getsockname(fd, (struct sockaddr*)&addr, &len); assert(ntohs(addr.sin_port) == 8080); close(fd); } ``` ## Resources - `assets/` - Socket templates - `references/` - Platform guides

Frequently asked questions