Implemented server

server.c

@@ -0,0 +1,83 @@
+#include "server.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include <errno.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+/*
+ * Macros
+ */
+#define LISTEN_BACKLOG      (2048)
+
+/*
+ * Data
+ */
+static int _fd = -1;
+
+/*
+ * Private API
+ */
+bool _accept() {
+    close(accept(_fd, 0, 0));
+    return true;
+}
+
+/*
+ * Public API
+ */
+int server_open(const char* host, int port) {
+    struct hostent *he = gethostbyname(host);
+    if (!he) {
+        printf("[!] gethostbyname failed: %d (h_errno)\n", h_errno);
+        return -1;
+    }
+    _fd = socket(
+        AF_INET,
+        SOCK_STREAM | SOCK_NONBLOCK,
+        IPPROTO_TCP
+    );
+    if (_fd == -1) {
+        printf("[!] socket failed: %d\n", errno);
+        return -1;
+    }
+    const int opt = 1;
+    if (setsockopt(_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
+        close(_fd);
+        printf("[!] setsockopt failed: %d\n", errno);
+        return -1;
+    }
+    struct sockaddr_in addr;
+    addr.sin_family = AF_INET;
+    addr.sin_port = htobe16(port);
+    memcpy(&addr.sin_addr, he->h_addr, he->h_length);
+    if (bind(_fd, (const void *)&addr, sizeof(addr)) == -1) {
+        close(_fd);
+        printf("[!] bind failed: %d\n", errno);
+        return -1;
+    }
+    if (listen(_fd, LISTEN_BACKLOG) == -1) {
+        close(_fd);
+        printf("[!] listen failed: %d\n", errno);
+        return -1;
+    }
+    return _fd;
+}
+
+void server_close() {
+    shutdown(_fd, SHUT_RDWR);
+    close(_fd);
+}
+
+bool server_event(uint32_t events) {
+    if (events & EPOLLIN) {
+        return _accept();
+    }
+    // we assume any event other than EPOLLIN is error
+    return false;
+}