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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