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// test if epoll can receive hangup at clients.
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <cstring>
#include <system_error>
#include <cerrno>
#include <sys/epoll.h>
#include <thread>
#include <iostream>
#include <unistd.h>
#include <vector>
int create_socket(const struct addrinfo& ai) {
int s = socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol);
if( s == -1 )
throw std::system_error(errno, std::system_category(), "socket");
int enable = 1;
if( setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) == -1 )
throw std::system_error(errno, std::system_category(), "setsocketopt");
if( bind(s, ai.ai_addr, ai.ai_addrlen) == -1 )
throw std::system_error(errno, std::system_category(), "bind");
if( listen(s, 10) == -1 )
throw std::system_error(errno, std::system_category(), "listen");
return s;
}
int main(int argc, char** argv) {
if( argc != 2 ) {
std::cout << "Usage: epoll PORT" << std::endl;
return 0;
}
struct addrinfo hint;
std::memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_UNSPEC;
hint.ai_socktype = SOCK_STREAM;
hint.ai_protocol = 0;
hint.ai_flags = AI_PASSIVE;
struct addrinfo *res;
int e = getaddrinfo(NULL, argv[1], &hint, &res);
if( e == EAI_SYSTEM ) {
throw std::system_error(errno, std::system_category(), "getaddrinfo");
} else if( e != 0 ) {
throw std::runtime_error(std::string("getaddrinfo: ") +
gai_strerror(e));
}
const struct addrinfo* p;
int s;
for( p = res; p != nullptr; p = p->ai_next )
if( p->ai_family == AF_INET6 ) break;
if( p != nullptr ) {
s = create_socket(*p);
} else {
for( p = res; p != nullptr; p = p->ai_next )
if( p->ai_family == AF_INET ) break;
if( p != nullptr ) {
s = create_socket(*p);
} else {
throw std::runtime_error("No address to bind.");
}
}
struct sockaddr addr;
socklen_t slen = sizeof(addr);
int clientfd = accept4(s, &addr, &slen, SOCK_NONBLOCK);
if( clientfd == -1 )
throw std::system_error(errno, std::system_category(), "accept4");
close(s);
int efd = epoll_create(10);
if( efd == -1 )
throw std::system_error(errno, std::system_category(), "epoll_create");
struct epoll_event ev;
ev.events = EPOLLIN|EPOLLET;
ev.data.fd = clientfd;
if( epoll_ctl(efd, EPOLL_CTL_ADD, clientfd, &ev) == -1 )
throw std::system_error(errno, std::system_category(), "epoll_ctl");
std::vector<char> buf(1 << 20);
struct epoll_event events[10];
while( true ) {
int n = epoll_wait(efd, events, 10, -1);
for(int i = 0; i < n; ++i ) {
if( events[i].events & EPOLLIN ) {
std::cout << "EPOLLIN" << std::endl;
while( true ) {
if( recv(events[i].data.fd, buf.data(), buf.size(), 0) == -1 )
break;
}
}
if( events[i].events & EPOLLHUP ) {
std::cout << "EPOLLHUP" << std::endl;
break;
}
if( events[i].events & EPOLLERR ) {
std::cout << "EPOLLHUP" << std::endl;
}
}
}
return 0;
}
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