feat: add unistd header

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.6...4.1.1)
 project(C302 C)
 SET(CMAKE_BUILD_TYPE "Release")
 

c302.c

@@ -2,8 +2,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/select.h>
 #include <sys/uio.h>
 #include <time.h>
+#include <unistd.h>
 #include "c302.h"
 
 static void http_error(errcode_enum_t code, char* msg) {
@@ -31,3 +33,18 @@ int main(int argc, char **argv) {
     };
     return writev(1, (const struct iovec *)&iov, 4) != len+sizeof(uint32_t);
 }
+
+static void __attribute__((destructor)) defer_close_fp() {
+    fflush(stdout);
+    char buf[256];
+    fd_set rfds;
+    struct timeval tv;
+    int ret;
+    FD_ZERO(&rfds);
+    FD_SET(0, &rfds);
+    tv.tv_sec = 1;
+    tv.tv_usec = 0;
+    if (select(1, &rfds, NULL, NULL, &tv) > 0 && FD_ISSET(0, &rfds)) {
+        read(0, buf, sizeof(buf));
+    }
+}