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110 lines
3 KiB
C++
110 lines
3 KiB
C++
/*
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g++ udp-connect-server.cpp ../../objs/st/libst.a -g -O0 -o udp-connect-server &&
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./udp-connect-server 127.0.0.1 8000 2
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "../../objs/st/st.h"
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <vector>
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using namespace std;
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vector<int> lfds;
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void* pfn(void* arg) {
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sockaddr_in addr = *(sockaddr_in*)arg;
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char* ip = inet_ntoa(addr.sin_addr);
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int port = ntohs(addr.sin_port);
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int fd = ::socket(AF_INET, SOCK_DGRAM, 0);
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assert(fd > 0);
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lfds.push_back(fd);
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// Find another thread to recv packet.
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int migrate_fd = 0;
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while (!migrate_fd) {
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for (int i = 0; i < (int)lfds.size(); i++) {
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if (lfds.at(i) != fd) {
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migrate_fd = lfds.at(i);
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break;
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}
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}
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st_usleep(10 * 1000);
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}
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if (true) {
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int v = 1;
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int r0 = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(int));
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assert(r0 != -1);
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}
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if (true) {
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int v = 1;
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int r0 = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(int));
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assert(r0 != -1);
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}
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if (true) {
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int r0 = bind(fd, (sockaddr*)&addr, sizeof(sockaddr_in));
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assert(!r0);
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}
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st_netfd_t stfd = st_netfd_open_socket(fd);
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printf("listen at %s:%d, fd=%d, migrate_fd=%d ok\n", ip, port, fd, migrate_fd);
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while (true) {
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char buf[1600] = {0};
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sockaddr_in from;
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int nb_from = sizeof(from);
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int r0 = st_recvfrom(stfd, buf, sizeof(buf), (sockaddr*)&from, &nb_from, ST_UTIME_NO_TIMEOUT);
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printf("fd #%d, peer %s:%d, got %dB, %s\n", fd, inet_ntoa(from.sin_addr), ntohs(from.sin_port), r0, buf);
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if (r0 <= 0) {
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break;
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}
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// When we got the packet, connect to another thread.
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// If it is of type SOCK_DGRAM, this call specifies the peer with which the socket
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// is to be associated; this address is that to which datagrams are to be sent, and
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// the only address from which datagrams are to be received.
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errno = 0;
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r0 = connect(migrate_fd, (const sockaddr*)&from, (socklen_t)nb_from);
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printf("Transfer %s:%d from #%d to #%d, r0=%d, errno=%d\n", inet_ntoa(from.sin_addr), ntohs(from.sin_port),
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fd, migrate_fd, r0, errno);
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st_usleep(10 * 1000);
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}
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st_netfd_close(stfd);
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return NULL;
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}
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int main(int argc, char** argv) {
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if (argc < 4) {
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printf("Usage: %s ip port workers\n", argv[0]);
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exit(-1);
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}
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st_init();
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const char* ip = argv[1];
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int port = ::atoi(argv[2]);
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int workers = ::atoi(argv[3]);
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printf("Start %d workers, at %s:%d\n", workers, ip, port);
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sockaddr_in addr;
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = inet_addr(ip);
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addr.sin_port = htons(port);
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for (int i = 0; i < workers; i++) {
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st_thread_t thread = st_thread_create(pfn, &addr, 1, 0);
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assert(thread);
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}
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st_thread_exit(NULL);
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return 0;
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}
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