Linux 关于inet_ntoa()
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something about inet_ntoa()
提问by venus.w
I write a server using the function char* inet_ntoa(struct in_addr in),When I included the header
<sys/socket.h>and <netinet/in.h>,an executable binary can be generated with compiler warnings, but a segment fault happens, when the program handle the return string from inet_ntoa. But when I added the header <arpa/inet.h>,everything seems ok.
我使用函数写一个服务器char* inet_ntoa(struct in_addr in),当我包括报头
<sys/socket.h>和<netinet/in.h>，可以用编译器警告生成可执行的二进制，但段发生故障，当程序手柄从返回字符串inet_ntoa。但是当我添加标题时，<arpa/inet.h>,一切似乎都没问题。
What's the matter?
怎么了？
采纳答案by Piotr Praszmo
arpa/inet.hcontains the declaration of char* inet_ntoa(struct in_addr in). If you don't include this header your compiler will use implicit declaration int inet_ntoa(). Wrong declaration can easily lead to segfault, especially if you are on system where sizeof(int)!=sizeof(void*).
arpa/inet.h包含 的声明char* inet_ntoa(struct in_addr in)。如果您不包含此头文件，您的编译器将使用隐式声明int inet_ntoa()。错误的声明很容易导致段错误，特别是如果你在系统 where sizeof(int)!=sizeof(void*).
If you are using gccyou can add -Wallflag. gccwill warn you about using functions without explicit declaration.
如果您正在使用，gcc您可以添加-Wall标志。gcc将警告您使用没有显式声明的函数。
