完成了第 15 章 套接字和标准I/O

ch15/syscpy.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <fcntl.h>
+#define BUF_SIZE 3
+
+int main(int argc, char *argv[])
+{
+    int fd1, fd2;
+    int len;
+    char buf[BUF_SIZE];
+
+    fd1 = open("news.txt", O_RDONLY);
+    fd2 = open("cpy.txt", O_WRONLY | O_CREAT | O_TRUNC);
+
+    while ((len = read(fd1, buf, sizeof(buf))) > 0)
+        write(fd2, buf, len);
+
+    close(fd1);
+    close(fd2);
+
+    return 0;
+}