我继续使用c / c ++学习网络编程，之后我创建了多进程tcp服务器，我想创建简单的http服务器，它返回静态资源，我使用epoll所以让我显示我的代码
首先我使用fd passing for handle request in workers 所以，我的主要功能和头脑过程
struct Descriptors{
int sv[2];
};
class Parent{
public:
static Parent& getInstance(){
static Parent instance;
return instance;
}
Parent(Parent const&) = delete;
void operator=(Parent const&) = delete;
void addFd(int fd){
m_fd.push_back(fd);
};
void run() {
startServer();
size_t index = 0;
while(true){
struct epoll_event Events[MAX_EVENTS];
int N = epoll_wait(m_epoll, Events, MAX_EVENTS, -1);
for (size_t i =0; i < N; ++i){
if (Events[i].events & EPOLLHUP){
epoll_ctl(m_epoll, EPOLL_CTL_DEL, Events[i].data.fd, &(Events[i]));
shutdown(Events[i].data.fd,SHUT_RDWR);
close(Events[i].data.fd);
continue;
}else {
if (Events[i].data.fd == m_masterSocket) {
handleConnection();
}else {
char * arg = "1";
ssize_t size = sock_fd_write(m_fd[index], arg, 1,Events[i].data.fd);
index = (1+index) % m_fd.size();
}
}
}
}
}
private:
Parent(){
m_numCpu = sysconf(_SC_NPROCESSORS_ONLN);
}
void startServer(){
m_masterSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
struct sockaddr_in SockAddr;
SockAddr.sin_family = AF_INET;
SockAddr.sin_port = htons(11141);
SockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(m_masterSocket, (struct sockaddr *)(&SockAddr), sizeof(SockAddr));
set_nonblock(m_masterSocket);
listen(m_masterSocket, SOMAXCONN);
m_epoll = epoll_create1(0);
struct epoll_event Event;
Event.data.fd = m_masterSocket;
Event.events = EPOLLIN | EPOLLRDHUP;
epoll_ctl(m_epoll, EPOLL_CTL_ADD, m_masterSocket, &Event);
}
void handleConnection(){
int SlaveSocket = accept(m_masterSocket, 0, 0);
set_nonblock(SlaveSocket);
struct epoll_event Event;
Event.data.fd = SlaveSocket;
Event.events = EPOLLIN | EPOLLRDHUP;
epoll_ctl(m_epoll, EPOLL_CTL_ADD, SlaveSocket, &Event);
}
int m_epoll;
int m_masterSocket;
int m_numCpu;
std::vector<int> m_fd;
};
void parent(int sock){
Parent::getInstance().addFd(sock);
}
int main(int argc, char **argv){
int numCpu = sysconf(_SC_NPROCESSORS_ONLN);
std::vector<Descriptors> desc;
desc.resize(numCpu);
bool isParent = true;
for (int i = 0; i < numCpu && isParent; ++i){
std::cout << "pid my is = " << getpid() <<std::endl;
int sv[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) < 0) {
perror("socketpair");
exit(1);
}
pid_t forkId = fork();
switch (forkId){
case 0:{
isParent = false;
close(sv[0]);
child(sv[1]);
break;
}
case -1:
perror("fork");
exit(1);
default:
close(sv[1]);
parent(sv[0]);
break;
}
}
if (isParent){
Parent::getInstance().run();
int status;
waitpid(-1, &status, 0);
}
}
我的工作流程是
void respond(int fd)
{
char mesg[99999], *reqline[3], data_to_send[BYTES], path[99999];
int rcvd, fileDesc, bytes_read;
memset( (void*)mesg, (int)'\0', 99999 );
const char *ROOT = "/home/web_server/";
int RecvResult = recv(fd,mesg, 99999, MSG_NOSIGNAL);
if (RecvResult == 0 && errno != EAGAIN){
shutdown(fd,SHUT_RDWR);
close(fd);
}else if (RecvResult >0){
printf("%s", mesg);
reqline[0] = strtok (mesg, " \t\n"); // split on lexemes
if ( strncmp(reqline[0], "GET\0", 4)==0 ) // if first 4 character equal
{
reqline[1] = strtok (NULL, " \t");
reqline[2] = strtok (NULL, " \t\n");
std::cout << "reqline 1 " << reqline[1] << std::endl;
std::cout << "reqline 2 " << reqline[2] << std::endl;
if ( strncmp( reqline[2], "HTTP/1.0", 8)!=0
&& strncmp(reqline[2], "HTTP/1.1", 8 ) !=0 )
{
write(fd, "HTTP/1.0 400 Bad Request\n", 25);
}
else
{
if ( strncmp(reqline[1], "/\0", 2)==0 )
reqline[1] = "/index.html";
strcpy(path, ROOT);
strcpy(&path[strlen(ROOT)], reqline[1]);
printf("file: %s\n", path);
if ( (fileDesc=open(path, O_RDONLY))!=-1 )
{
send(fd, "HTTP/1.0 200 OK\n\n", 17, 0);
while ( (bytes_read=read(fileDesc, data_to_send, BYTES))>0 )
write (fd, data_to_send, bytes_read);
}
else write(fd, "HTTP/1.0 404 Not Found\n", 23);
}
}
}
shutdown(fd,SHUT_RDWR);
close(fd);
}
void child(int sock)
{
int fd;
char buf[16];
ssize_t size;
sleep(1);
for (;;) {
size = sock_fd_read(sock, buf, sizeof(buf), &fd);
if (size <= 0)
break;
if (fd != -1) {
respond(fd);
}
}
printf("child processes is end\n");
}
当我进入浏览器http://127.0.0.1:11141/时，它就可以了，我得到了index.html，但是当我在apache基准测试中运行时，
ab -n 10 -c 10 http://127.0.0.1:11141/
我得到答案
This is ApacheBench, Version 2.3
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)...apr_socket_recv: Connection reset by peer (104)
Total of 2 requests completed
我不明白我的错误在哪里，因为我认为理论上我的服务器（因为使用epoll）必须解决C10K problem。但在实践中，我的服务器无法解决10连接问题。请问你能帮帮我吗？ 感谢您提供有用的链接和任何建议！
更新 当我以
运行时 strace -f ./server 2> error.txt
在error.txt结尾
[pid 6552] write(6, 0x7ffdbff00390, 757) = -1 EPIPE (Broken pipe)
[pid 6552] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=6552, si_uid=1000} ---
[pid 6552] +++ killed by SIGPIPE +++
write(1, 0x7fc5ffbe3000, 83) = 83
write(1, 0x7fc5ffbe3000, 12) = 12
write(1, 0x7fc5ffbe3000, 20) = 20
write(1, 0x7fc5ffbe3000, 41) = 41
open(0x7ffdbff18e30, O_RDONLY) = 11
sendto(10, 0x403df9, 17, 0, NULL, 0) = 17
read(11, 0x7ffdbff00390, 1024) = 757
write(10, 0x7ffdbff00390, 757) = -1 EPIPE (Broken pipe)
--- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=6554, si_uid=1000} ---
+++ killed by SIGPIPE +++
所以我认为EPipe错误存在问题，但我不明白为什么......
更新
所以我认为关闭描述符中的问题，但我不明白如何解决它。感谢您提供有用的建议。
更新
我在工作进程中发送函数发送错误
答案 0 :(得分：-1)
似乎我发现了我的错误，正确的版本功能无效：
void respond(int fd)
{
char mesg[99999], *reqline[3], data_to_send[BYTES], path[99999];
int rcvd, fileDesc, bytes_read;
memset( (void*)mesg, (int)'\0', 99999 );
const char *ROOT = "/home/web_server/";
int RecvResult = recv(fd,mesg, 99999, MSG_NOSIGNAL);
//EAGAIN - "there is no data available right now, try again later
if (RecvResult == 0 && errno != EAGAIN){
shutdown(fd,SHUT_RDWR);
close(fd);
std::cout << "error recv" << std::endl;
return;
}else if (RecvResult >0){
printf("%s", mesg);
reqline[0] = strtok (mesg, " \t\n"); // split on lexemes
if ( strncmp(reqline[0], "GET\0", 4)==0 ) // if first 4 character equal
{
reqline[1] = strtok (NULL, " \t");
reqline[2] = strtok (NULL, " \t\n");
std::cout << "reqline 1 " << reqline[1] << std::endl;
std::cout << "reqline 2 " << reqline[2] << std::endl;
if ( strncmp( reqline[2], "HTTP/1.0", 8)!=0
&& strncmp(reqline[2], "HTTP/1.1", 8 ) !=0 )
{
send(fd, "HTTP/1.0 400 Bad Request\n", 25 , MSG_NOSIGNAL);
}
else
{
if ( strncmp(reqline[1], "/\0", 2)==0 )
reqline[1] = "/index.html";
strcpy(path, ROOT);
strcpy(&path[strlen(ROOT)], reqline[1]);
printf("file: %s\n", path);
if ( (fileDesc=open(path, O_RDONLY))!=-1 )
{
send(fd, "HTTP/1.0 200 OK\n\n", 17, MSG_NOSIGNAL);
while ( (bytes_read=read(fileDesc, data_to_send, BYTES))>0 )
{
if (bytes_read != -1)
send (fd, data_to_send, bytes_read, MSG_NOSIGNAL);
}
}
else send(fd, "HTTP/1.0 404 Not Found\n", 23, MSG_NOSIGNAL);
}
shutdown(fd,SHUT_RDWR);
close(fd);
}
}else {
std::cout << "Client disconnected unexpect" << std::endl;
}
}
问题是，我关闭套接字，之后我尝试从这个套接字读取。