头文件麻烦 [英] Trouble with header file

问题描述

在编译我编写的c代码时，我收到以下错误。我明白问题出在头文件中。任何人都可以告诉我需要哪些头文件来定义这些功能。

I got the following error on compiling a c code I wrote. I understand that the problem is in the header file. Can anyone please tell me which all header files are needed to define these functions.

sign.c: In function ‘main’:
sign.c:78: warning: assignment makes pointer from integer without a cast
/tmp/ccnsSeHy.o: In function `sign_data_evp':
sign.c:(.text+0x68): undefined reference to `check_ssl_rv'
sign.c:(.text+0xd5): undefined reference to `check_ssl_rv'
sign.c:(.text+0x13e): undefined reference to `check_ssl_rv'
/tmp/ccnsSeHy.o: In function `main':
sign.c:(.text+0x1ca): undefined reference to `initialize'
sign.c:(.text+0x1d6): undefined reference to `select_engine'
sign.c:(.text+0x20a): undefined reference to `sign_data'
sign.c:(.text+0x216): undefined reference to `clean_engine'
sign.c:(.text+0x21b): undefined reference to `clean_up'
collect2: ld returned 1 exit status

目前我使用的头文件是：

The header files that I have used so far is:

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#ifdef __VMS
#include <socket.h>
#include <inet.h>

#include <in.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

#include <openssl/crypto.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

操作平台：Linux
提前感谢

Operating platform: Linux Thanks in advance.

推荐答案

你明白错了。它不抱怨未知功能原型，它在链接期间抱怨。所以你可能忘了链接某些库或一些对象文件。

You understand it wrong. It does not complain about unknown function prototype, it complains during the linking. So you probably forgot to link with some library or some object file.

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