diff --git a/client.c b/client.c
index d71679b..462c965 100644
--- a/client.c
+++ b/client.c
@@ -9,6 +9,9 @@
 #include <arpa/inet.h>
 #include <sys/stat.h>
 #include <pthread.h>
+#if !__APPLE__
+    #include <sys/sendfile.h>
+#endif
 
 int sockfd;
 char buf[BUFSIZ];
@@ -68,16 +71,22 @@ int main(int argc,char *argv[]) {   //usage: ./client host port
                 fp = fopen(buf, "rb");
                 if(fp) {
                     off_t len;
-                    struct iovec headers;
-                    headers.iov_base = &file_size;
-                    headers.iov_len = sizeof(uint32_t);
-                    hdtr.headers = &headers;
-                    hdtr.hdr_cnt = 1;
                     file_size = (uint32_t)fileSize(buf);
-                    if(!sendfile(fileno(fp), sockfd, 0, &len, &hdtr, 0)) puts("Send file success.");
-                    else puts("Send file error.");
-                    printf("Send count:%lld\n", len);
+                    #if __APPLE__
+                        struct iovec headers;
+                        headers.iov_base = &file_size;
+                        headers.iov_len = sizeof(uint32_t);
+                        hdtr.headers = &headers;
+                        hdtr.hdr_cnt = 1;
+                        if(!sendfile(fileno(fp), sockfd, 0, &len, &hdtr, 0)) puts("Send file success.");
+                        else puts("Send file error.");
+                    #else
+                        send(timer->accept_fd, &file_size, sizeof(uint32_t), 0);
+                        if(!sendfile(fileno(fp), sockfd, &len, file_size)) puts("Send file success.");
+                        else puts("Send file error.");
+                    #endif
                     fclose(fp);
+                    printf("Send count:%lld\n", len);
                 } else puts("Open file error!");
             } else send(sockfd, buf, strlen(buf), 0);
             sleep(1);
diff --git a/server.c b/server.c
index a73391f..914a030 100644
--- a/server.c
+++ b/server.c
@@ -13,6 +13,9 @@
 #include <unistd.h>
 #include <pthread.h>
 #include <time.h>
+#if !__APPLE__
+    #include <sys/sendfile.h>    
+#endif
 
 #define PASSWORD "fumiama"
 
@@ -120,14 +123,19 @@ int sendAll(char* file_path, THREADTIMER *timer) {
     if(fp) {
         timer->fp = fp;
         timer->is_open = 1;
-        struct iovec headers;
         uint32_t file_size = (uint32_t)fileSize(file_path);
         off_t len;
-        headers.iov_base = &file_size;
-        headers.iov_len = sizeof(uint32_t);
-        hdtr.headers = &headers;
-        hdtr.hdr_cnt = 1;
-        sendfile(fileno(fp), timer->accept_fd, 0, &len, &hdtr, 0);
+        #if __APPLE__
+            struct iovec headers;
+            headers.iov_base = &file_size;
+            headers.iov_len = sizeof(uint32_t);
+            hdtr.headers = &headers;
+            hdtr.hdr_cnt = 1;
+            sendfile(fileno(fp), timer->accept_fd, 0, &len, &hdtr, 0);
+        #else
+            send(timer->accept_fd, &file_size, sizeof(uint32_t), 0);
+            sendfile(fileno(fp), timer->accept_fd, &len, file_size);
+        #endif
         printf("Send %lld bytes.", len);
         closeFile(fp);
         timer->is_open = 0;