解决gcc报错：error: implicit declaration of function ‘inet_addr’ [-Werror=implicit-function-declaration]

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下午在写代码编译时报了如下这些错：

/home/mininet/openvswitch-2.10.1/datapath/linux/datapath.c:239:1: error: implicit declaration of function ‘socket’ [-Werror=implicit-function-declaration]int sock_cli = socket(AF_INET,SOCK_STREAM, 0);^
/home/mininet/openvswitch-2.10.1/datapath/linux/datapath.c:245:5: error: implicit declaration of function ‘inet_addr’ [-Werror=implicit-function-declaration]servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");  ^
/home/mininet/openvswitch-2.10.1/datapath/linux/datapath.c:246:5: error: implicit declaration of function ‘connect’ [-Werror=implicit-function-declaration]if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)^
/home/mininet/openvswitch-2.10.1/datapath/linux/datapath.c:248:9: error: implicit declaration of function ‘perror’ [-Werror=implicit-function-declaration]perror("connect error!");^
/home/mininet/openvswitch-2.10.1/datapath/linux/datapath.c:250:4: error: implicit declaration of function ‘send’ [-Werror=implicit-function-declaration]if(send(sock_cli, skb->data,skb->tail-skb->data ,0)<0){

我的函数是没问题的，问题是我调用了未声明的函数，也就是说编译器不知道这个函数的返回值和参数列表
需要在前面加个函数声明就可以了，或者在对于的.h文件中增加函数声明。

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解决gcc报错：error: implicit declaration of function ‘inet_addr’ [-Werror=implicit-function-declaration]

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