我在＆＃39;拍卖＆＃39;编程项目。但是服务器文件不是从客户端读取数据而是在我在客户端写东西后立即终止信号SIGCHLD。任何人都可以建议我，我应该如何读取数据，以防止此错误？ 提前致谢。 下面是两个文件的代码片段。
server_auction.cpp
void sig_child(int signo) {
pid_t pid;
int stat;
pid = wait(&stat);
cout<<"child "<<pid<<" terminated with status "<<stat<<endl;
}
void err_sys(const char* x) {
perror(x); // defined in stdio.h
exit(1); // indicates unsuccessful program termination
}
int main(int argc, char** argv) {
//char*product_name[];
int listenfd, connfd, childpid;
int option; // option =1 if sell otherwise 0 to buy
int productNo = 0;
ssize_t n;
char buffer[maxBuffer];
socklen_t clilen;
Product obj[maxProduct];
struct sockaddr_in servaddr, cliaddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
bind(listenfd, (struct sockaddr*) &servaddr, sizeof(servaddr));
listen(listenfd, 5);
cout<<"Starting Auction...."<<endl;
signal(SIGCHLD, sig_child);
for(;;) {
clilen = sizeof(cliaddr);
if((connfd = accept(listenfd, (struct sockaddr*)&cliaddr, &clilen))<0) {
err_sys("Accept blocks...exiting");
break;
}
cout<<"running"<<endl;
if((childpid = fork())==0) {
cout<<"running2"<<endl;
close(listenfd);
cout<<"running3"<<endl;
read(connfd, buffer, maxBuffer); //option
cout<<"buffer:"<<buffer;
if((option = atoi(buffer))==0) { // sell
read(connfd, buffer, maxBuffer); //cust_name
strcpy(obj[productNo].cust_name, buffer);
read(connfd, buffer, maxBuffer); //product_id
strcpy(obj[productNo].product_id, buffer);
read(connfd, buffer, maxBuffer); //product_details
strcpy(obj[productNo].product_details, buffer);
read(connfd, buffer, maxBuffer); //current_bid
obj[productNo].initialBidPrice = atof(buffer); //initialBidPrice
obj[productNo].current_bid = atof(buffer);
read(connfd, buffer, maxBuffer); //endTime
struct tm tm;
strptime(buffer, "%B/%e/%Y-%H:%M:%S", &tm); // Aug/1/2017-23:02:51
time_t t = mktime(&tm);
obj[productNo].endTime = t;
time_t startTime;
time(&startTime);
obj[productNo].startTime = startTime; //startTime
exit(0);
//close(connfd);
}
}
productNo++;
cout<<"Client Joined: "<<childpid<<endl;
}
close(listenfd);
cout<<"Server terminated";
return 0;
}
client_auction.cpp
int main(int argc, char**argv) {
char* category[] = {"Vehicle", "Electronics", "Electricals", "Precious"};
char* category0[] = {"Car", "Bike", "Bicycle", "Tricycle", "Taxi", "Auto"};
char* category1[] = {"Laptop", "Desktop", "Cellphone"};
char* category2[] = {"Refrigerator", "Air Conditioner"};
char* category3[] = {"Watch", "Wood", "Iron"};
//char* productID =(char*)malloc(10);
struct sockaddr_in servaddr, cliaddr;
char buffer[maxBuffer];
int sockfd, choice, option1, option2, initialBidPrice;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
servaddr.sin_addr.s_addr=inet_addr("127.0.0.1");
connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr));
cout<<"Connection established"<<endl;
//while((fgets(buffer,4096,stdin))!=NULL) {
cout<<"Want to sell(0) or buy(1) ";
cin>>choice;
snprintf(buffer, sizeof(buffer),"%d",choice);
write(sockfd, buffer, maxBuffer); // option
if(choice == 0) {
strcpy(buffer,"");
cout<<"Enter your name"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer); // cust_name
strcpy(buffer,"");
cout<<"Choose product category"<<endl;
cout<<"1. Vehicle\n2. Electronics\n 3. Electricals\n4. Precious"<<endl;
cin>>option1;
switch(option1) {
case 1: cout<<"Choose product item in Vehicle Category"<<endl;
cout<<"1. Car\n2. Bike\n 3. Bicycle\n4. Tricycle\n5. Taxi\n6. Auto"<<endl;
cin>>option2;
snprintf(buffer, sizeof(buffer),"%d_%d",option1-1, option2-1);
write(sockfd, buffer, maxBuffer); //product_id
strcpy(buffer,"");
cout<<"Give your "<<category0[option2-1]<<" details"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer);
break;
case 2: cout<<"Choose product item in Electronics Category"<<endl;
cout<<"1. Laptop\n2. Desktop\n 3. Cellphone"<<endl;
cin>>option2;
snprintf(buffer, sizeof(buffer),"%d_%d",option1-1, option2-1);
write(sockfd, buffer, maxBuffer); //product_id
strcpy(buffer,"");
cout<<"Give your "<<category1[option2-1]<<" details"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer);
break;
case 3: cout<<"Choose product item in Electricals Category"<<endl;
cout<<"1. Refrigerator\n2. Air Conditioner"<<endl;
cin>>option2;
snprintf(buffer, sizeof(buffer),"%d_%d",option1-1, option2-1);
write(sockfd, buffer, maxBuffer); //product_id
strcpy(buffer,"");
cout<<"Give your "<<category2[option2-1]<<" details"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer); // product_details
break;
case 4: cout<<"Choose product item in Precious Category"<<endl;
cout<<"1. Watch\n2. Wood\n3. Iron"<<endl;
cin>>option2;
snprintf(buffer, sizeof(buffer),"%d_%d",option1-1, option2-1);
write(sockfd, buffer, maxBuffer); //product_id
strcpy(buffer,"");
cout<<"Give your "<<category3[option2-1]<<" details"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer);
break;
}
cout<<"Enter price to start Bid"<<endl;
cin>>initialBidPrice;
strcpy(buffer,"");
snprintf(buffer, sizeof(buffer),"%d",initialBidPrice);
write(sockfd, buffer, maxBuffer); // current_bid
strcpy(buffer,"");
cout<<"Enter closing time and date in format e.g., Aug/1/2017-23:02:51"<<endl;
gets(buffer);
write(sockfd, buffer, maxBuffer);
}
exit(1);close(sockfd);
return 0;
}