linux c TCP/IP 编译问题 error: storage size of ‘addrCriteria’ isn’t known解决办法

linux c TCP/IP 编译getaddrinfo.c时出现error: storage size of ‘addrCriteria’ isn’t known解决办法。

原因是：netdb.h不是C99标准里定义的函数,是posix标准里的，-std=c99 会导致netdb.h无效了，但是-std=c99 才支持 for()指针语法，使用c99的话，经测试其他的getaddrinfo等函数就会出问题，故不使用-std=c99,换成while循环，问题解决。

请看源码：

1、getaddrinfo.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include "DieWithMessage.h"


void PrintSocketAddress(const struct sockaddr *address, FILE *stream) {
    // Test for address and stream
    if (address == NULL || stream == NULL)
        return;

    void *numericAddress; // Pointer to binary address
    // Buffer to contain result (IPv6 sufficient to hold IPv4)
    char addrBuffer[INET6_ADDRSTRLEN];
    in_port_t port; // Port to print
    // Set pointer to address based on address family
    switch (address->sa_family) {
        case AF_INET:
            numericAddress = &((struct sockaddr_in *) address)->sin_addr;
            port = ntohs(((struct sockaddr_in *) address)->sin_port);
            break;
        case AF_INET6:
            numericAddress = &((struct sockaddr_in6 *) address)->sin6_addr;
            port = ntohs(((struct sockaddr_in6 *) address)->sin6_port);
            break;
        default:
            fputs("[unknown type]", stream); // Unhandled type
            return;
    }
    // Convert binary to printable address
    if (inet_ntop(address->sa_family, numericAddress, addrBuffer,
            sizeof (addrBuffer)) == NULL)
        fputs("[invalid address]", stream); // Unable to convert
    else {
        fprintf(stream, "%s", addrBuffer);
        if (port != 0) // Zero not valid in any socket addr
            fprintf(stream, "-%u", port);
    }
}


int main(int argc, char *argv[]) {

  if (argc != 3) // Test for correct number of arguments
    DieWithUserMessage("Parameter(s)", "<Address/Name> <Port/Service>");

  char *addrString = argv[1];   // Server address/name
  char *portString = argv[2];   // Server port/service

  // Tell the system what kind(s) of address info we want
  struct addrinfo addrCriteria;                   // Criteria for address match
  memset(&addrCriteria, 0, sizeof(addrCriteria)); // Zero out structure
  addrCriteria.ai_family = AF_UNSPEC;             // Any address family
  addrCriteria.ai_socktype = SOCK_STREAM;         // Only stream sockets
  addrCriteria.ai_protocol = IPPROTO_TCP;         // Only TCP protocol

  // Get address(es) associated with the specified name/service
  struct addrinfo *addrList; // Holder for list of addresses returned
  // Modify servAddr contents to reference linked list of addresses
  int rtnVal = getaddrinfo(addrString, portString, &addrCriteria, &addrList);
  if (rtnVal != 0)
    DieWithUserMessage("getaddrinfo() failed", (const char*)gai_strerror(rtnVal));

  // Display returned addresses
  /**for (struct addrinfo *addr = addrList; addr != NULL; addr = addr->ai_next) {
    PrintSocketAddress(addr->ai_addr, stdout);
    fputc('\n', stdout);
  }*///-std=c99 才支持 for()指针语法，但是使用c99的话，经测试其他的getaddrinfo等函数就会出问题，故换成while循环，问题解决。
//是-std=c99 导致netdb h无效了
	struct addrinfo *addr = addrList;
    while (addr != NULL) {
        PrintSocketAddress(addr->ai_addr, stdout);
        fputc('\n', stdout);
         addr = addr->ai_next;
    }
	

  freeaddrinfo(addrList); // Free addrinfo allocated in getaddrinfo()

  exit(0);
}

/* 
 * File:   DieWithMessage.h
 * Author: root
 *
 * Created on 2013年11月13日, 下午3:52
 */

#ifndef DIEWITHMESSAGE_H
#define	DIEWITHMESSAGE_H

#ifdef	__cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdlib.h>
 void  DieWithUserMessage(const char *msg,const char * detail)
 {
     fputs(msg,stderr);
     fputs(":",stderr);
     fputs(detail,stderr);
     fputs("\n",stderr);
     exit(1);
 }
 void DieWithSystemMessage(const char* msg)
 {
     perror(msg);
     exit(1);
 }



#ifdef	__cplusplus
}
#endif

#endif	/* DIEWITHMESSAGE_H */

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