mirror of
https://github.com/matrix-construct/construct
synced 2024-08-25 11:02:08 +02:00
* librb is no longer a separately configured subproject. * charybdis is now a standalone directory with a binary. * Include path layout now requires a directory ircd/ rb/ etc.
506 lines
10 KiB
C
506 lines
10 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* sigio.c: Linux Realtime SIGIO compatible network routines.
|
|
*
|
|
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
|
|
* Copyright (C) 1996-2002 Hybrid Development Team
|
|
* Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au>
|
|
* Copyright (C) 2002 Aaron Sethman <androsyn@ratbox.org>
|
|
* Copyright (C) 2002 ircd-ratbox development team
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
|
|
* USA
|
|
*
|
|
*/
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1 /* Needed for F_SETSIG */
|
|
#endif
|
|
|
|
#include <rb/rb.h>
|
|
#include <rb/commio_int.h>
|
|
#include <rb/event_int.h>
|
|
|
|
#if defined(HAVE_SYS_POLL_H) && (HAVE_POLL) && (F_SETSIG)
|
|
#define USING_SIGIO
|
|
#endif
|
|
|
|
|
|
#ifdef USING_SIGIO
|
|
|
|
#include <sys/poll.h>
|
|
|
|
#if defined(USE_TIMER_CREATE)
|
|
#define SIGIO_SCHED_EVENT 1
|
|
#endif
|
|
|
|
#define RTSIGIO SIGRTMIN
|
|
#define RTSIGTIM (SIGRTMIN+1)
|
|
|
|
|
|
struct _pollfd_list
|
|
{
|
|
struct pollfd *pollfds;
|
|
int maxindex; /* highest FD number */
|
|
int allocated;
|
|
};
|
|
|
|
typedef struct _pollfd_list pollfd_list_t;
|
|
|
|
pollfd_list_t pollfd_list;
|
|
static int can_do_event = 0;
|
|
static int sigio_is_screwed = 0; /* We overflowed our sigio queue */
|
|
static sigset_t our_sigset;
|
|
|
|
|
|
/*
|
|
* rb_init_netio
|
|
*
|
|
* This is a needed exported function which will be called to initialise
|
|
* the network loop code.
|
|
*/
|
|
int
|
|
rb_init_netio_sigio(void)
|
|
{
|
|
int fd;
|
|
pollfd_list.pollfds = rb_malloc(rb_getmaxconnect() * (sizeof(struct pollfd)));
|
|
pollfd_list.allocated = rb_getmaxconnect();
|
|
for(fd = 0; fd < rb_getmaxconnect(); fd++)
|
|
{
|
|
pollfd_list.pollfds[fd].fd = -1;
|
|
}
|
|
|
|
pollfd_list.maxindex = 0;
|
|
|
|
sigio_is_screwed = 1; /* Start off with poll first.. */
|
|
|
|
sigemptyset(&our_sigset);
|
|
sigaddset(&our_sigset, RTSIGIO);
|
|
sigaddset(&our_sigset, SIGIO);
|
|
#ifdef SIGIO_SCHED_EVENT
|
|
sigaddset(&our_sigset, RTSIGTIM);
|
|
#endif
|
|
sigprocmask(SIG_BLOCK, &our_sigset, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
resize_pollarray(int fd)
|
|
{
|
|
if(rb_unlikely(fd >= pollfd_list.allocated))
|
|
{
|
|
int x, old_value = pollfd_list.allocated;
|
|
pollfd_list.allocated += 1024;
|
|
pollfd_list.pollfds =
|
|
rb_realloc(pollfd_list.pollfds,
|
|
pollfd_list.allocated * (sizeof(struct pollfd)));
|
|
memset(&pollfd_list.pollfds[old_value + 1], 0, sizeof(struct pollfd) * 1024);
|
|
for(x = old_value + 1; x < pollfd_list.allocated; x++)
|
|
{
|
|
pollfd_list.pollfds[x].fd = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* void setup_sigio_fd(int fd)
|
|
*
|
|
* Input: File descriptor
|
|
* Output: None
|
|
* Side Effect: Sets the FD up for SIGIO
|
|
*/
|
|
|
|
int
|
|
rb_setup_fd_sigio(rb_fde_t *F)
|
|
{
|
|
int flags = 0;
|
|
int fd = F->fd;
|
|
flags = fcntl(fd, F_GETFL, 0);
|
|
if(flags == -1)
|
|
return 0;
|
|
/* if set async, clear it so we can reset it in the kernel :/ */
|
|
if(flags & O_ASYNC)
|
|
{
|
|
flags &= ~O_ASYNC;
|
|
fcntl(fd, F_SETFL, flags);
|
|
}
|
|
|
|
flags |= O_ASYNC | O_NONBLOCK;
|
|
|
|
if(fcntl(fd, F_SETFL, flags) == -1)
|
|
return 0;
|
|
|
|
if(fcntl(fd, F_SETSIG, RTSIGIO) == -1)
|
|
return 0;
|
|
if(fcntl(fd, F_SETOWN, getpid()) == -1)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* rb_setselect
|
|
*
|
|
* This is a needed exported function which will be called to register
|
|
* and deregister interest in a pending IO state for a given FD.
|
|
*/
|
|
void
|
|
rb_setselect_sigio(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
|
|
{
|
|
if(F == NULL)
|
|
return;
|
|
|
|
if(type & RB_SELECT_READ)
|
|
{
|
|
F->read_handler = handler;
|
|
F->read_data = client_data;
|
|
if(handler != NULL)
|
|
F->pflags |= POLLRDNORM;
|
|
else
|
|
F->pflags &= ~POLLRDNORM;
|
|
}
|
|
if(type & RB_SELECT_WRITE)
|
|
{
|
|
F->write_handler = handler;
|
|
F->write_data = client_data;
|
|
if(handler != NULL)
|
|
F->pflags |= POLLWRNORM;
|
|
else
|
|
F->pflags &= ~POLLWRNORM;
|
|
}
|
|
|
|
resize_pollarray(F->fd);
|
|
|
|
if(F->pflags <= 0)
|
|
{
|
|
pollfd_list.pollfds[F->fd].events = 0;
|
|
pollfd_list.pollfds[F->fd].fd = -1;
|
|
if(F->fd == pollfd_list.maxindex)
|
|
{
|
|
while(pollfd_list.maxindex >= 0
|
|
&& pollfd_list.pollfds[pollfd_list.maxindex].fd == -1)
|
|
pollfd_list.maxindex--;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pollfd_list.pollfds[F->fd].events = F->pflags;
|
|
pollfd_list.pollfds[F->fd].fd = F->fd;
|
|
if(F->fd > pollfd_list.maxindex)
|
|
pollfd_list.maxindex = F->fd;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* int rb_select(long delay)
|
|
* Input: The maximum time to delay.
|
|
* Output: Returns -1 on error, 0 on success.
|
|
* Side-effects: Deregisters future interest in IO and calls the handlers
|
|
* if an event occurs for an FD.
|
|
* Comments: Check all connections for new connections and input data
|
|
* that is to be processed. Also check for connections with data queued
|
|
* and whether we can write it out.
|
|
* Called to do the new-style IO, courtesy of squid (like most of this
|
|
* new IO code). This routine handles the stuff we've hidden in
|
|
* rb_setselect and fd_table[] and calls callbacks for IO ready
|
|
* events.
|
|
*/
|
|
int
|
|
rb_select_sigio(long delay)
|
|
{
|
|
int num = 0;
|
|
int revents = 0;
|
|
int sig;
|
|
int fd;
|
|
int ci;
|
|
PF *hdl;
|
|
rb_fde_t *F;
|
|
void *data;
|
|
siginfo_t si;
|
|
|
|
struct timespec timeout;
|
|
if(rb_sigio_supports_event() || delay >= 0)
|
|
{
|
|
timeout.tv_sec = (delay / 1000);
|
|
timeout.tv_nsec = (delay % 1000) * 1000000;
|
|
}
|
|
|
|
for(;;)
|
|
{
|
|
if(!sigio_is_screwed)
|
|
{
|
|
if(can_do_event || delay < 0)
|
|
{
|
|
sig = sigwaitinfo(&our_sigset, &si);
|
|
}
|
|
else
|
|
sig = sigtimedwait(&our_sigset, &si, &timeout);
|
|
|
|
if(sig > 0)
|
|
{
|
|
|
|
if(sig == SIGIO)
|
|
{
|
|
rb_lib_log
|
|
("Kernel RT Signal queue overflowed. Is ulimit -i too small(or perhaps /proc/sys/kernel/rtsig-max on old kernels)");
|
|
sigio_is_screwed = 1;
|
|
break;
|
|
}
|
|
#ifdef SIGIO_SCHED_EVENT
|
|
if(sig == RTSIGTIM && can_do_event)
|
|
{
|
|
struct ev_entry *ev = (struct ev_entry *)si.si_ptr;
|
|
if(ev == NULL)
|
|
continue;
|
|
rb_run_one_event(ev);
|
|
continue;
|
|
}
|
|
#endif
|
|
fd = si.si_fd;
|
|
pollfd_list.pollfds[fd].revents |= si.si_band;
|
|
revents = pollfd_list.pollfds[fd].revents;
|
|
num++;
|
|
F = rb_find_fd(fd);
|
|
if(F == NULL)
|
|
continue;
|
|
|
|
if(revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
|
|
{
|
|
hdl = F->read_handler;
|
|
data = F->read_data;
|
|
F->read_handler = NULL;
|
|
F->read_data = NULL;
|
|
if(hdl)
|
|
hdl(F, data);
|
|
}
|
|
|
|
if(revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))
|
|
{
|
|
hdl = F->write_handler;
|
|
data = F->write_data;
|
|
F->write_handler = NULL;
|
|
F->write_data = NULL;
|
|
if(hdl)
|
|
hdl(F, data);
|
|
}
|
|
}
|
|
else
|
|
break;
|
|
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
if(!sigio_is_screwed) /* We don't need to proceed */
|
|
{
|
|
rb_set_time();
|
|
return 0;
|
|
}
|
|
|
|
signal(RTSIGIO, SIG_IGN);
|
|
signal(RTSIGIO, SIG_DFL);
|
|
sigio_is_screwed = 0;
|
|
|
|
|
|
num = poll(pollfd_list.pollfds, pollfd_list.maxindex + 1, delay);
|
|
rb_set_time();
|
|
if(num < 0)
|
|
{
|
|
if(!rb_ignore_errno(errno))
|
|
return RB_OK;
|
|
else
|
|
return RB_ERROR;
|
|
}
|
|
if(num == 0)
|
|
return RB_OK;
|
|
|
|
/* XXX we *could* optimise by falling out after doing num fds ... */
|
|
for(ci = 0; ci < pollfd_list.maxindex + 1; ci++)
|
|
{
|
|
if(((revents = pollfd_list.pollfds[ci].revents) == 0)
|
|
|| (pollfd_list.pollfds[ci].fd) == -1)
|
|
continue;
|
|
fd = pollfd_list.pollfds[ci].fd;
|
|
F = rb_find_fd(fd);
|
|
if(F == NULL)
|
|
continue;
|
|
if(revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR))
|
|
{
|
|
hdl = F->read_handler;
|
|
data = F->read_data;
|
|
F->read_handler = NULL;
|
|
F->read_data = NULL;
|
|
if(hdl)
|
|
hdl(F, data);
|
|
}
|
|
|
|
if(IsFDOpen(F) && (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)))
|
|
{
|
|
hdl = F->write_handler;
|
|
data = F->write_data;
|
|
F->write_handler = NULL;
|
|
F->write_data = NULL;
|
|
if(hdl)
|
|
hdl(F, data);
|
|
}
|
|
if(F->read_handler == NULL)
|
|
rb_setselect_sigio(F, RB_SELECT_READ, NULL, NULL);
|
|
if(F->write_handler == NULL)
|
|
rb_setselect_sigio(F, RB_SELECT_WRITE, NULL, NULL);
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(SIGIO_SCHED_EVENT)
|
|
void
|
|
rb_sigio_init_event(void)
|
|
{
|
|
rb_sigio_supports_event();
|
|
}
|
|
|
|
|
|
int
|
|
rb_sigio_supports_event(void)
|
|
{
|
|
timer_t timer;
|
|
struct sigevent ev;
|
|
if(can_do_event == 1)
|
|
return 1;
|
|
if(can_do_event == -1)
|
|
return 0;
|
|
|
|
ev.sigev_signo = SIGVTALRM;
|
|
ev.sigev_notify = SIGEV_SIGNAL;
|
|
if(timer_create(CLOCK_REALTIME, &ev, &timer) != 0)
|
|
{
|
|
can_do_event = -1;
|
|
return 0;
|
|
}
|
|
timer_delete(timer);
|
|
can_do_event = 1;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
rb_sigio_sched_event(struct ev_entry *event, int when)
|
|
{
|
|
timer_t *id;
|
|
struct sigevent ev;
|
|
struct itimerspec ts;
|
|
if(can_do_event <= 0)
|
|
return 0;
|
|
|
|
memset(&ev, 0, sizeof(ev));
|
|
event->comm_ptr = rb_malloc(sizeof(timer_t));
|
|
id = event->comm_ptr;
|
|
ev.sigev_notify = SIGEV_SIGNAL;
|
|
ev.sigev_signo = RTSIGTIM;
|
|
ev.sigev_value.sival_ptr = event;
|
|
|
|
if(timer_create(CLOCK_REALTIME, &ev, id) < 0)
|
|
{
|
|
rb_lib_log("timer_create: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
memset(&ts, 0, sizeof(ts));
|
|
ts.it_value.tv_sec = when;
|
|
ts.it_value.tv_nsec = 0;
|
|
if(event->frequency != 0)
|
|
ts.it_interval = ts.it_value;
|
|
|
|
if(timer_settime(*id, 0, &ts, NULL) < 0)
|
|
{
|
|
rb_lib_log("timer_settime: %s\n", strerror(errno));
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
rb_sigio_unsched_event(struct ev_entry *event)
|
|
{
|
|
if(can_do_event <= 0)
|
|
return;
|
|
timer_delete(*((timer_t *) event->comm_ptr));
|
|
rb_free(event->comm_ptr);
|
|
event->comm_ptr = NULL;
|
|
}
|
|
#endif /* SIGIO_SCHED_EVENT */
|
|
|
|
#else
|
|
|
|
int
|
|
rb_init_netio_sigio(void)
|
|
{
|
|
return ENOSYS;
|
|
}
|
|
|
|
void
|
|
rb_setselect_sigio(rb_fde_t *F, unsigned int type, PF * handler, void *client_data)
|
|
{
|
|
errno = ENOSYS;
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_select_sigio(long delay)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
rb_setup_fd_sigio(rb_fde_t *F)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if !defined(USING_SIGIO) || !defined(SIGIO_SCHED_EVENT)
|
|
void
|
|
rb_sigio_init_event(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_sigio_sched_event(struct ev_entry *event, int when)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
rb_sigio_unsched_event(struct ev_entry *event)
|
|
{
|
|
return;
|
|
}
|
|
|
|
int
|
|
rb_sigio_supports_event(void)
|
|
{
|
|
errno = ENOSYS;
|
|
return 0;
|
|
}
|
|
#endif /* !USING_SIGIO || !SIGIO_SCHED_EVENT */
|