server.c File Reference

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <poll.h>
#include "lib_server.h"

Include dependency graph for server.c:

Functions
ssize_t	read_client (int clientfd, char **p_buf, size_t *p_data_len, size_t *p_buf_size)
	Reading client's buffer at given position. More...
const char *	generate_content (int x_coord, int y_coord, int x_max, int y_max, struct string *content, struct string *robot_grid, struct string *cookie, struct templates *p_tem)
	Generate HTTP response's content for given coordinates. More...
void	handle_client (int clientfd, struct sockaddr_in client_addr, struct templates *p_tem)
	Handles a given client. More...
int	main (void)
	Creates server and accept clients' connexions. More...

Function Documentation

generate_content()

const char * generate_content	(	int	x_coord,
		int	y_coord,
		int	x_max,
		int	y_max,
		struct string *	content,
		struct string *	robot_grid,
		struct string *	cookie,
		struct templates *	p_tem
	)

Generate HTTP response's content for given coordinates.

Parameters

x_coord	Robot's x coordinate.
y_coord	Robot's y coordinate.
x_max	Value max for x (so number of lines in the grid - 1).
y_max	Value max for y (so number of columns in the grid - 1).
content	Pointer to string structure containing response content.
robot_grid	Pointer to string structure containing the robot grid.
cookie	Pointer to string structure containing cookies.
p_tem	p_tem Pointer to the structure containing all template data.

Returns

Content-Type.

handle_client()

void handle_client	(	int	clientfd,
		struct sockaddr_in	client_addr,
		struct templates *	p_tem
	)

Handles a given client.

Parameters

clientfd	Client's file descriptor.
client_addr	Client's address.
p_tem	Pointer to the structure containing all template data.

main()

int main

(

void

)

Creates server and accept clients' connexions.

• Creates a socket and get its file descriptor.
• Define IP address and port.
• Attaches socket to the previously defined address and port.
• Marks the socket as ready to receive entry connexions.
• Reads all necessary templates files.
• Get clients connexion address.
• Calls handle_client().
• Closes client's file descriptor.

See https://clembytes.fr/2025/07/17/robot-episode-1-create-a-server-in-c/ for details.

read_client()

ssize_t read_client	(	int	clientfd,
		char **	p_buf,
		size_t *	p_data_len,
		size_t *	p_buf_size
	)

Reading client's buffer at given position.

Reading of client buffer into buf at position data_len (data_len is the size of already written data) for as many characters as possible (to fill the buffer buf or to read everything).

Performs realloc when receiving buffer is full (double size).

Parameters

clientfd	Client's file descriptor.
p_buf	Pointer to beginning of the receiving buffer.
p_data_len	Pointer to the size of already written data.
p_buf_size	Pointer to the maximum size of the receiving buffer.

Returns

Integer: 0: client disconnected -1: fail n: read response, number of characters read