我正在使用多線程服務器/客戶端。我遇到的問題是服務器處理有時看起來有點不同。發回的消息總是正確的,但服務器打印的消息有點奇怪。如果它是一個像「你好」這樣的簡短字,那麼一切正常。如果是長字或有空間,如「Binominalkoeffizient」失印serversided消息字符串是:意外的多線程服務器反應 - C
Binomina
lkoeffiz
ient
fiz
任何想法,我的錯誤是什麼?
PS:當我使用telnet時,服務器反應是一樣的!
服務器主營:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <pthread.h>
#include "server.h"
int main(int argc, const char * argv[]) {
int sock;
struct sockaddr_in server;
sock = socket(AF_INET, SOCK_STREAM, 0);
socketStatusCheck(sock);
puts("[*] Starting Server ...");
puts("[*] Initialize Server ...");
initializeServer(&server, 8888);
bindServerToAddress(sock, server);
puts("[*] Waiting for incomming connections ... ");
puts("");
listen(sock, 3);
connectionSwitch(sock);
close(sock);
return 0;
}
服務器的文件
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <pthread.h>
#include "server.h"
void socketStatusCheck(int sock) {
if (sock == -1) {
perror("Error creating the socket: ");
exit(0);
}
}
void initializeServer(struct sockaddr_in *server, int port) {
server->sin_family = AF_INET;
server->sin_addr.s_addr = INADDR_ANY;
server->sin_port = htons(port);
}
void bindServerToAddress(int sock, struct sockaddr_in server) {
if (bind(sock, (struct sockaddr*) &server, sizeof(server)) < 0) {
perror("Error binding port: ");
}
}
void connectionSwitch(int sock) {
int nsock, lenbuf;
struct sockaddr_in client;
pthread_t pid = NULL;
lenbuf = sizeof(struct sockaddr_in);
while ((nsock = accept(sock, (struct sockaddr*) &client, (socklen_t*) &lenbuf))) {
puts("Client connected!");
if (pthread_create(&pid, NULL, connectionHandler, (void*) &nsock))
perror("Error creating thread: ");
}
if (nsock < 0) {
perror("Error accepting incomming client: ");
}
pthread_exit(pid);
}
void *connectionHandler(void *sockptr) {
int sock = *(int*) sockptr;
long isConnected;
char *smessage, *recvmessage;
smessage = "Hello! I am the server you just connected! \n";
write(sock, smessage, strlen(smessage));
recvmessage = malloc(5000 * sizeof(char)); // while ((isConnected = recv(sock, recvmessage, sizeof(recvmessage), 0)) > 0)
while ((isConnected = recv(sock, recvmessage, sizeof(recvmessage), 0)) > 0) {
//write(sock, recvmessage, sizeof(recvmessage));
send(sock, recvmessage, sizeof(recvmessage), 0);
puts(recvmessage);
}
if (isConnected == 0) {
perror("Client disconnected: ");
fflush(stdout);
}
free(recvmessage); recvmessage = NULL;
return 0;
}
'free(recvmessage); recvmessage = NULL;'是毫無意義的,刪除第二條語句。 –
那是因爲你一次只能讀取8個字節('sizeof(recvmessage)'是8),並且你在讀完每組8個字節後打印換行符。 – immibis