feat: 阻塞式 EpollLoop 封装通过测试

examples/raw_epoll_tcp_loop.cpp

@@ -0,0 +1,116 @@
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <cstring>
+#include <iostream>
+
+/* set nonblock socket */
+int set_nonblock(int fd)
+{
+    int flags = fcntl(fd, F_GETFL /* Get file discriptor state */, 0);
+    return fcntl(fd, F_SETFL /* Set new file discriptor */, flags | O_NONBLOCK);
+}
+
+int main()
+{
+    int sock_fd = socket(
+        AF_INET,     /* IPv4 */
+        SOCK_STREAM, /* TCP */
+        0 /* File Descriptor */);
+    if (sock_fd < 0)
+    {
+        perror("socket create error");
+        return 1;
+    }
+
+    int opt = 1;
+    setsockopt(
+        sock_fd,
+        SOL_SOCKET,
+        SO_REUSEADDR, /* Allow to bind port muiltiple times */
+        &opt,
+        sizeof(opt));
+
+    sockaddr_in addr{};                /* Internet socket address */
+    addr.sin_family = AF_INET;         /* IPv4 */
+    addr.sin_port = htons(8080);       /* Port */
+    addr.sin_addr.s_addr = INADDR_ANY; /* listen all */
+
+    if (bind(sock_fd, (sockaddr *)&addr, sizeof(addr))) /* Bind file descriptor with socket address. */
+    {
+        perror("bind address error");
+        return 1;
+    }
+    if (listen(sock_fd, SOMAXCONN /* Max wait queue that system allows. */)) /* Listen the file descriptor */
+    {
+        perror("set listen queue error");
+        return 1;
+    }
+    set_nonblock(sock_fd);
+
+    puts("Server listening on port 8080...");
+
+    int epoll_fd = epoll_create1(0); /* create epoll instance */
+    epoll_event ev{};                /* create epoll event instance*/
+    ev.events = EPOLLIN;             /**/
+    ev.data.fd = sock_fd;
+    epoll_ctl(
+        epoll_fd,
+        EPOLL_CTL_ADD, /* Add a file descriptor into epoll to be listened. */
+        sock_fd,
+        &ev);
+
+    const int MAX_EVENTS = 64;
+    epoll_event events[MAX_EVENTS];
+
+    while (true)
+    {
+        int n = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
+        for (int i = 0; i < n; ++i)
+        {
+            int fd = events[i].data.fd;
+            if (fd == sock_fd)
+            {
+                while (true)
+                {
+                    int client_fd = accept(sock_fd, nullptr, nullptr);
+                    if (client_fd < 0)
+                        break;
+                    printf("New client connected: %d\n", client_fd);
+                    set_nonblock(client_fd);
+
+                    epoll_event cli_ev{};
+                    cli_ev.events = EPOLLIN; /* Wait for new epoll connection */
+                    cli_ev.data.fd = client_fd;
+                    epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &cli_ev);
+                }
+            }
+            else
+            {
+                char buf[1024];
+                memset(buf, 0, sizeof(buf));
+                ssize_t r = read(fd, buf, sizeof(buf));
+                write(fd, buf, r); /* Echo data into buffer */
+
+                if (r <= 0 || (!memcmp("exit", buf, 4)))
+                {
+                    epoll_ctl(
+                        epoll_fd,
+                        EPOLL_CTL_DEL, /* Delete file descriptor in epoll */
+                        fd,
+                        nullptr);
+                    close(fd);
+                    continue;
+                }
+
+                printf(buf);
+            }
+        }
+    }
+
+    close(epoll_fd);
+    close(sock_fd);
+    return 0;
+}