Add setup function to server/socket_server

server/socket_server.c

@@ -0,0 +1,70 @@
+#include "socket_server.h"
+#include <math.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+/**
+ * Gets the address info for the given port, such that the server will listen on 0.0.0.
+ *
+ * @param port The port to listen on.
+ * @param info A pointer to a location where getaddrinfo can store data.
+ *
+ * @return The result of getaddrinfo. See `man getaddrinfo` for details.
+ */
+static int build_addr_info(int port, struct addrinfo **info) {
+    struct addrinfo hints = {.ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM};
+    // Get the number of chars in the port
+    int port_length = floor(log10(port)) + 1;
+    char *port_string = malloc((port_length + 1) * sizeof(char));
+    sprintf(port_string, "%d", port);
+
+    int addr_status = getaddrinfo(NULL, port_string, &hints, info);
+    free(port_string);
+
+    return addr_status;
+}
+
+/**
+ * Setup the server's socket for listening.
+ *
+ * @param port The port to listen on.
+ *
+ * @return A server_info representing the result of setting up the socket.
+ */
+struct server_info setup(int port) {
+    struct server_info info = {.sock_fd = -1};
+    struct addrinfo *addr_info;
+    int addr_status = build_addr_info(port, &addr_info);
+    if (addr_status != 0) {
+        info.status = STATUS_ERROR;
+        return info;
+    }
+
+    info.sock_fd = socket(addr_info->ai_family, addr_info->ai_socktype, addr_info->ai_protocol);
+    if (info.sock_fd == -1) {
+        info.status = STATUS_ERROR;
+        return info;
+    }
+
+    int bind_result = bind(info.sock_fd, addr_info->ai_addr, addr_info->ai_addrlen);
+    if (bind_result == -1) {
+        close(info.sock_fd);
+        info.sock_fd = -1;
+        info.status = STATUS_ERROR;
+        return info;
+    }
+
+    int listen_result = listen(info.sock_fd, 8);
+    if (listen_result == -1) {
+        close(info.sock_fd);
+        info.sock_fd = -1;
+        info.status = STATUS_ERROR;
+        return info;
+    }
+    info.status = STATUS_LISTENING;
+
+    return info;
+}

server/socket_server.h

@@ -0,0 +1,15 @@
+#ifndef SOCKET_SERVER
+#define SOCKET_SERVER
+
+#define BACKLOG_SIZE 8;
+
+enum server_status {STATUS_LISTENING, STATUS_CLOSED, STATUS_ERROR};
+struct server_info {
+    int sock_fd;
+    enum server_status status;
+};
+
+struct server_info setup(int port);
+char *serve(struct server_info *info);
+
+#endif