关于C#：’FILE’在Contiki中是未知的类型

'FILE' is unknown type in Contiki

我正试图在康提基的一个文件中测试写作。这是我使用的代码：

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#include"contiki.h"
#include <stdio.h>
#define LEN 256
PROCESS(test_process,"Coffee test process");
AUTOSTART_PROCESSES(&test_process);
PROCESS_THREAD(test_process, ev, data)
/**/
{
PROCESS_BEGIN();
FILE * fp;
int i;
/* open the file for writing*/
fp = fopen ("/home/user/contiki/examples/mySim/1.txt","w");

/* write 10 lines of text into the file stream*/
for(i = 0; i < 10;i++){
fprintf (fp,"This is line %d
",i + 1);
}

/* close the file*/
fclose (fp);
PROCESS_END();
}

在Cooja模拟器中编译后，我收到此错误消息：

test.c: In function ‘process_thread_test_process’:
test.c:12:1: error: unknown type name ‘FILE’
test.c:15:4: warning: implicit declaration of function ‘fopen’ [-Wimplicit-function-declaration]
test.c:15:7: warning: assignment makes pointer from integer without a cast [enabled by default]
test.c:19:8: warning: implicit declaration of function ‘fprintf’ [-Wimplicit-function-declaration]
test.c:19:8: warning: incompatible implicit declaration of built-in function ‘fprintf’ [enabled by default]
test.c:23:4: warning: implicit declaration of function ‘fclose’ [-Wimplicit-function-declaration]
make: *** [test.co] Error 1
Process returned error code 2

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有人知道这个问题吗？