void daemon_loop(void) { SERVICE_OPTIONS *opt; int temporary_lack_of_resources; while(1) { temporary_lack_of_resources=0; if(s_poll_wait(fds, -1, -1)>=0) { if(s_poll_canread(fds, signal_pipe[0])) if(signal_pipe_dispatch()) /* received SIGNAL_TERMINATE */ break; /* terminate daemon_loop */ for(opt=service_options.next; opt; opt=opt->next) if(opt->option.accept && s_poll_canread(fds, opt->fd)) if(accept_connection(opt)) temporary_lack_of_resources=1; } else { log_error(LOG_NOTICE, get_last_socket_error(), "daemon_loop: s_poll_wait"); temporary_lack_of_resources=1; } if(temporary_lack_of_resources) { s_log(LOG_NOTICE, "Accepting new connections suspended for 1 second"); sleep(1); /* to avoid log trashing */ } } }
void child_status(void) { /* dead libwrap or 'exec' process detected */ int pid, status; char *sig_name; #ifdef HAVE_WAIT_FOR_PID while((pid=wait_for_pid(-1, &status, WNOHANG))>0) { #else if((pid=wait(&status))>0) { #endif #ifdef WIFSIGNALED if(WIFSIGNALED(status)) { sig_name=signal_name(WTERMSIG(status)); s_log(LOG_INFO, "Child process %d terminated on %s", pid, sig_name); str_free(sig_name); } else { s_log(LOG_INFO, "Child process %d finished with code %d", pid, WEXITSTATUS(status)); } #else s_log(LOG_INFO, "Child process %d finished with status %d", pid, status); #endif } } #endif /* !defined(USE_OS2) */ #endif /* !defined(USE_WIN32) */ /**************************************** main loop accepting connections */ void daemon_loop(void) { while(1) { int temporary_lack_of_resources=0; int num=s_poll_wait(fds, -1, -1); if(num>=0) { SERVICE_OPTIONS *opt; s_log(LOG_DEBUG, "Found %d ready file descriptor(s)", num); if(service_options.log_level>=LOG_DEBUG) /* performance optimization */ s_poll_dump(fds, LOG_DEBUG); if(s_poll_canread(fds, signal_pipe[0])) if(signal_pipe_dispatch()) /* SIGNAL_TERMINATE or error */ break; /* terminate daemon_loop */ for(opt=service_options.next; opt; opt=opt->next) if(opt->option.accept && s_poll_canread(fds, opt->fd)) if(accept_connection(opt)) temporary_lack_of_resources=1; } else { log_error(LOG_NOTICE, get_last_socket_error(), "daemon_loop: s_poll_wait"); temporary_lack_of_resources=1; } if(temporary_lack_of_resources) { s_log(LOG_NOTICE, "Accepting new connections suspended for 1 second"); sleep(1); /* to avoid log trashing */ } } } /* return 1 when a short delay is needed before another try */ NOEXPORT int accept_connection(SERVICE_OPTIONS *opt) { SOCKADDR_UNION addr; char *from_address; SOCKET s; socklen_t addrlen; addrlen=sizeof addr; for(;;) { s=s_accept(opt->fd, &addr.sa, &addrlen, 1, "local socket"); if(s!=INVALID_SOCKET) /* success! */ break; switch(get_last_socket_error()) { case S_EINTR: /* interrupted by a signal */ break; /* retry now */ case S_EMFILE: #ifdef S_ENFILE case S_ENFILE: #endif #ifdef S_ENOBUFS case S_ENOBUFS: #endif #ifdef S_ENOMEM case S_ENOMEM: #endif return 1; /* temporary lack of resources */ default: return 0; /* any other error */ } } from_address=s_ntop(&addr, addrlen); s_log(LOG_DEBUG, "Service [%s] accepted (FD=%d) from %s", opt->servname, s, from_address); str_free(from_address); #ifdef USE_FORK RAND_add("", 1, 0.0); /* each child needs a unique entropy pool */ #else if(max_clients && num_clients>=max_clients) { s_log(LOG_WARNING, "Connection rejected: too many clients (>=%ld)", max_clients); closesocket(s); return 0; } #endif if(create_client(opt->fd, s, alloc_client_session(opt, s, s), client_thread)) { s_log(LOG_ERR, "Connection rejected: create_client failed"); closesocket(s); return 0; } return 0; }