为getaddrinfo声明参数的顺序是否重要？

Question

我正在使用getaddrinfo()编写一个小型服务器客户端程序。

而

#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <mswsock.h>
#include <ws2tcpip.h>

char port[] = "1933";
char ip[]  = "192.168.178.26";

int main() {
    // Prolog - init socket
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2,1), &wsaData) != 0) {
        printf("- ERROR : WSAStartup() : %d", WSAGetLastError());
        return 0;
    }

    int status;
    SOCKET sock;
    struct addrinfo *res = NULL;
    struct addrinfo *p = NULL;
    struct addrinfo hints;
    memset(&hints, 0, sizeof(hints));

    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    status = getaddrinfo(ip, port, &hints, &res);

    for ( p = res; p != NULL; p = p->ai_next ) {
    printf("Before calling socket:\n\tres\t= %p\n\tp\t= %p\n", res, p);

        // check all returned entries
        if ( (sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1 ) {
            printf("- ERROR : socket() : ",
            WSAGetLastError());
            continue; }

    printf("After calling socket:\n\tres\t= %p\n\tp\t= %p\n", res, p);

        if ( connect(sock, p->ai_addr, p->ai_addrlen) == -1 ) {
            printf("- ERROR : connect() : ",
            WSAGetLastError());
            continue; }

        // socket was successfully connected
        else {
    printf("After calling connect:\n\tres\t= %p\n\tp\t= %p\n", res, p);
            printf("+ SUCCESS : socket connected\n");
            freeaddrinfo(res);
            return sock; }
    }
    freeaddrinfo(res);
    printf("- ERROR : socket could not be connected\n");
    return 0;
}

工作正常，将struct addrinfo hints;的位置更改为

int status;
SOCKET sock;
struct addrinfo hints;
struct addrinfo *res = NULL;
struct addrinfo *p = NULL;
memset(&hints, 0, sizeof(hints));

创建套接字后，

将导致意外行为。详细信息会在第一次调用*res之后随机更改socket()。

我使用 Codeblocks 和 GNU GCC编译器进行编码。

输出 version1 （正常工作）：

Before calling socket:
    res = 0049FBC8
    p   = 0049FBC8
After calling socket:
    res = 0049FBC8
    p   = 0049FBC8
After calling connect:
    res = 0049FBC8
    p   = 0049FBC8
+ SUCCESS : socket connected

输出 version2 （不工作）：

Before calling socket:
    res = 007DFBC8
    p   = 007DFBC8
After calling socket:
    res = 00000002
    p   = 007DFBC8
After calling connect:
    res = 0000007C
    p   = 007DFBC8
+ SUCCESS : socket connected