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我正在實現多客戶端聊天服務器，並且出現以下錯誤。只有從錯誤描述中得到的提示是它是一個鏈接器錯誤。任何人都可以幫我解決這個問題。C中的多客戶端聊天服務器 - 執行問題
viper[1052]% gcc -Wall -o server server.c
server.c: In function âMainServerLoopâ:
server.c:45: warning: pointer targets in passing argument 3 of âacceptâ differ in signedness
/tmp/ccQIY5wn.o: In function `MainServerLoop':
server.c:(.text+0x6c): undefined reference to `ListCreate'
server.c:(.text+0xb3): undefined reference to `ListCreate'
server.c:(.text+0xcc): undefined reference to `ListAddInt'
server.c:(.text+0x25b): undefined reference to `ListAddString'
server.c:(.text+0x27d): undefined reference to `ListAddInt'
server.c:(.text+0x4bf): undefined reference to `ListDeleteInt'
server.c:(.text+0x4cc): undefined reference to `ListDeleteString'
server.c:(.text+0x6d0): undefined reference to `ListDestroy'
server.c:(.text+0x6d9): undefined reference to `ListDestroy'
collect2: ld returned 1 exit status
/*List.h */
#ifndef __RUL_LIST_H__
#define __RUL_LIST_H__
#define MAX_STRING_LEN 21
typedef struct TAG_LIST_ITEM {
union {
char strval[MAX_STRING_LEN];
int intval;
} values;
struct TAG_LIST_ITEM *next;
} ListItem;
typedef struct TAG_LIST {
ListItem *first;
ListItem *last;
unsigned int count;
} List;
List *ListCreate();
void ListDestroy(List **list);
void ListAddString(List *, const char *item);
void ListDeleteString(List *, const char *item);
void ListAddInt(List *, int item);
void ListDeleteInt(List *, int item);
#endif
/* List.h */
/*Server.c*/
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "list.h"
const int SERVER_PORT = 13000;
const int BUFFER_SIZE = 256;
const int MAX_BUFFER_NUM = 100;
const int MAX_CLIENT_ID_LEN = MAX_STRING_LEN - 1;
void MainServerLoop(int);
void HandleClient(int connfd);
int Max(List *list);
void MainServerLoop(int sockfd)
{
char clientID[MAX_CLIENT_ID_LEN + 1];
List *listClientID = ListCreate();
int connfd, i;
struct sockaddr_in cliAddr;
int lenAddr = sizeof(cliAddr);
fd_set readfds;
FD_ZERO(&readfds);
List *listSock = ListCreate();
ListAddInt(listSock, sockfd);
FD_SET(sockfd, &readfds);
char readbuf[BUFFER_SIZE];
char writebuf[MAX_BUFFER_NUM][BUFFER_SIZE];
int numWriteBuf = 0;
while (select(Max(listSock) + 1, &readfds, NULL, NULL, NULL) >= 0)
{
if (FD_ISSET(sockfd, &readfds)) // listening socket
{
connfd = accept(sockfd, (struct sockaddr *)&cliAddr, &lenAddr);
if (connfd < 0)
{
printf("error while calling accept()\n");
exit(1);
}
int len = read(connfd, clientID, MAX_CLIENT_ID_LEN);
if (len > 0)
{
if (clientID[len] != '\0')
{
clientID[len] = '\0';
}
ListAddString(listClientID, clientID);
printf("user %s logged in\n", clientID);
ListAddInt(listSock, connfd);
printf("Number of user : %d\n", listClientID->count);
printf("Number of sock desc : %d\n" , listSock->count);
if (numWriteBuf < MAX_BUFFER_NUM)
{
sprintf(writebuf[numWriteBuf++], "User %s logged in\n", clientID);
}
}
else
{
close(connfd);
}
}
ListItem *sockItem = listSock->first;
if (sockItem) sockItem = sockItem->next; // bypass listening socket
ListItem *clientIDItem = listClientID->first;
while (sockItem != 0 && clientIDItem != 0)
{
if (FD_ISSET(sockItem->values.intval, &readfds)) // connected socket
{
int len = read(sockItem->values.intval, readbuf, BUFFER_SIZE - 1);
if (len > 0)
{
if (numWriteBuf < MAX_BUFFER_NUM)
{
readbuf[len] = '\0';
strcpy(writebuf[numWriteBuf], clientIDItem->values.strval);
strncat(writebuf[numWriteBuf], ": ", 2);
strncat(writebuf[numWriteBuf], readbuf, len);
++numWriteBuf;
}
}
else if (len == 0)
{
ListItem *nextSock = sockItem->next;
ListItem *nextClient = clientIDItem->next;
FD_CLR(sockItem->values.intval, &readfds);
close(sockItem->values.intval);
printf("user %s logged off\n", clientIDItem->values.strval);
ListDeleteInt(listSock, sockItem->values.intval);
ListDeleteString(listClientID, clientIDItem->values.strval);
printf("Number of user : %d\n", listClientID->count);
printf("Number of sock desc : %d\n" , listSock->count);
if (numWriteBuf < MAX_BUFFER_NUM)
{
sprintf(writebuf[numWriteBuf++],
"User %s logged off\n", clientIDItem->values.strval);
}
sockItem = nextSock;
clientIDItem = nextClient;
continue;
}
}
sockItem = sockItem->next;
clientIDItem = clientIDItem->next;
}
for (i = 0; i < numWriteBuf; ++i)
{
sockItem = listSock->first;
if (sockItem) sockItem = sockItem->next; // bypass listening socket
while (sockItem != 0)
{
write(sockItem->values.intval, writebuf[i], strlen(writebuf[i]) + 1);
sockItem = sockItem->next;
}
}
numWriteBuf = 0;
sockItem = listSock->first;
while (sockItem != 0)
{
FD_SET(sockItem->values.intval, &readfds);
sockItem = sockItem->next;
}
}
printf("server error %d, exit !\n",errno);
ListDestroy(&listSock);
ListDestroy(&listClientID);
}
int Max(List *listInt)
{
if (listInt->first == 0) return 0;
ListItem *curItem = listInt->first;
int max = curItem->values.intval;
curItem = curItem->next;
while (curItem != 0)
{
if (curItem->values.intval > max)
{
max = curItem->values.intval;
}
curItem = curItem->next;
}
return max;
}
int main()
{
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
printf("socket() function failed\n");
exit(1);
}
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(SERVER_PORT);
if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
printf("bind() function failed\n");
exit(1);
}
if (listen(sockfd, SOMAXCONN) < 0)
{
printf("listen() function failed\n");
exit(1);
}
printf("server started, listening at port %d\n", SERVER_PORT);
MainServerLoop(sockfd);
return 0;
}
/* Server.c*/
@unwind - @artelius 我真的很抱歉，我在編譯時做了一個包含list.c的非常愚蠢的錯誤。感謝您的幫助 – 2009-10-19 12:21:42