完成第一章 理解网络编程和套接字

ch01/fd_seri.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/socket.h>
+
+int main()
+{
+    int fd1, fd2, fd3;
+    //创建一个文件和两个套接字
+    fd1 = socket(PF_INET, SOCK_STREAM, 0);
+    fd2 = open("test.dat", O_CREAT | O_WRONLY | O_TRUNC);
+    fd3 = socket(PF_INET, SOCK_DGRAM, 0);
+    //输出之前创建的文件描述符的整数值
+    printf("file descriptor 1: %d\n", fd1);
+    printf("file descriptor 2: %d\n", fd2);
+    printf("file descriptor 3: %d\n", fd3);
+
+    close(fd1);
+    close(fd2);
+    close(fd3);
+    return 0;
+}