Simple sockets server wrapper in C

main.c

#include <stdio.h>

#define DEBUG
#include "server.h"

int main(int argc, char **argv) {
    server s;
    server_init(&s, AF_INET, SOCK_STREAM,\
                IPPROTO_TCP, 1313, INADDR_ANY);
    server_listen(&s, 15);
    while(1){
        server_accept_connection(&s);
        server_close_connection(&s);
    }
    return 0;
}

server.h

/*
MIT License

Copyright (c) 2018 Panagiotis Petridis

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/*
    Todo: remove unnecessery headers
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <errno.h>
#include <stdlib.h>

#define handle_error(msg) \
    do { perror(msg); exit(EXIT_FAILURE); } while(0)

typedef struct server {
    int server_conn;
    int client_conn;
    struct sockaddr_in server_sock_address;
    struct sockaddr_in client_sock_address;
} server;

/*
    HELPER FUNCTIONS
*/

int safe_socket(int domain, int type, int protocol) {
    int rv = socket(domain, type, protocol);
    if(rv == -1)
        handle_error("socket");
    return rv;
}

int safe_bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
    int rv = bind(sockfd, addr, addrlen);
    if(rv == -1)
        handle_error("bind");
    return rv;
}


int safe_listen(int sockfd, int backlog) {
    int rv = listen(sockfd, backlog);
    if(rv == -1)
        handle_error("listen");
    return rv;
}

int safe_accept(int sockfd, struct sockaddr* addr, socklen_t *addrlen) {
    int rv = accept(sockfd, addr, addrlen);
    if(rv == -1)
        handle_error("accept");
    return rv;
}

int safe_close(int sockfd) {
    int rv = close(sockfd);
    if(rv == -1)
        handle_error("safe_close");
    return rv;
}

/*
    INTERFACE
*/

/*
    load address using inet or pass INADDR_ANY to accept all connecitons
*/
void server_init(server* s, int domain, int type, int protocol,\
                 unsigned port, unsigned long address) {
    s->server_conn = safe_socket(domain, type, protocol);

    memset(&s->server_sock_address, 0, sizeof(struct sockaddr_in));
    s->server_sock_address.sin_family = domain;
    s->server_sock_address.sin_port = htons(port);
    s->server_sock_address.sin_addr.s_addr = address;
    
    safe_bind(s->server_conn, (struct sockaddr*)&(s->server_sock_address), \
              sizeof(struct sockaddr_in));
}

void server_listen(server* s, int backlog) {
    safe_listen(s->server_conn, backlog);
}

/*
    Accepts next connection. 
    If there is no connection it halts execution
*/
void server_accept_connection(server* s) {
    unsigned size = sizeof(struct sockaddr_in);
    s->client_conn = safe_accept(s->server_conn,\
                    (struct sockaddr*)&(s->client_sock_address),\
                    &size);
    #ifdef DEBUG
    printf("Conenction from %x port %d\n",\
           ntohl(s->client_sock_address.sin_addr.s_addr),\
           ntohs(s->client_sock_address.sin_port));
    #endif
}

void server_close_connection(server* s) {
    safe_close(s->client_conn);
}