My first project in C

logging.c

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include "l_logging.h"

#define LOG_FILE "server.log"

int init_logging()
{
	int file = open(LOG_FILE, O_CREAT | O_RDWR | O_APPEND, 0777);
	if(file == -1)
	{
		perror("[error][logging] error creating file");
	}
	return file;
}

void
close_logging(int log_fd)
{
	if(log_fd > -1){
		close(log_fd);
	}
}

void
l_info(char *message)
{
	int log_fd = init_logging(LOG_FILE);	
	write(log_fd, message, strlen(message));
	close_logging(&log_fd);

}

logging.h

int init_logging(char *pathname);
void close_logging(int log_fd);
void l_info(char *message);

main.c

#include <unistd.h>
#include "server.h"

#define PORT 8081
#define MAX_CONN 10

int main(int argc, char *argv[])
{
	struct server srv_local = make_server(PORT, MAX_CONN);

	close(srv_local.s_socket_fd);
	return 0;
}

server.c

#include <stdio.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "server.h"
#include "l_logging.h"

#define errExit(msg) do { perror(msg); printf("\n"); exit(EXIT_FAILURE); } while(0)

struct server make_server(int port, int maxConn)
{
	struct server srv;
	bzero(&srv, sizeof(struct server));

	// Create TCP socket
	srv.s_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
	if(srv.s_socket_fd == -1){
		errExit("[socket] failed to create socket.");
	}
	
	// Bind it
	srv.address.sin_family = AF_INET;
	srv.address.sin_port = htons(port);

	if(inet_aton("127.0.0.1", &srv.address.sin_addr) == 0)
	{
		errExit("[error][make_server] address invalid");
	}
	int yes = 1;
	setsockopt(srv.s_socket_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));
	
	// Listen
	int l_ret = listen(srv.s_socket_fd, maxConn);
	if(l_ret == -1){
		errExit("[listen] failed to reserve addr");
	}

	l_info("[make_server] succeeded");

	return srv;
}

void server_loop(struct server *server){
	
}

server.h

#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>

struct server {
	int s_socket_fd;
	struct sockaddr_in address;
};

struct peer{
	int s_fd;	
	struct sockaddr_in remote_addr;
};

struct server make_server(int port, int maxConn);
void server_loop(struct server *server);