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/*
* BSD kqueue() based ioloop notify handler.
*
* Copyright (c) 2005 Vaclav Haisman <v.haisman@sh.cvut.cz>
*/
#define _GNU_SOURCE
#include "lib.h"
#ifdef IOLOOP_NOTIFY_KQUEUE
#include "ioloop-private.h"
#include "llist.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <sys/stat.h>
/* kevent.udata's type just has to be different in NetBSD than in
FreeBSD and OpenBSD.. */
#ifdef __NetBSD__
# define MY_EV_SET(a, b, c, d, e, f, g) \
EV_SET(a, b, c, d, e, f, (intptr_t)g)
#else
# define MY_EV_SET(a, b, c, d, e, f, g) \
EV_SET(a, b, c, d, e, f, g)
#endif
struct io_notify {
struct io io;
int refcount;
int fd;
struct io_notify *prev, *next;
};
struct ioloop_notify_handler_context {
int kq;
struct io *event_io;
struct io_notify *notifies;
};
static void
io_loop_notify_free(struct ioloop_notify_handler_context *ctx,
struct io_notify *io)
{
DLLIST_REMOVE(&ctx->notifies, io);
i_free(io);
}
static void event_callback(struct ioloop_notify_handler_context *ctx)
{
struct io_notify *io;
struct kevent events[64];
struct timespec ts;
int i, ret;
ts.tv_sec = 0;
ts.tv_nsec = 0;
ret = kevent(ctx->kq, NULL, 0, events, N_ELEMENTS(events), &ts);
if (ret <= 0) {
if (ret == 0 || errno == EINTR)
return;
i_fatal("kevent(notify) failed: %m");
}
i_gettimeofday(&ioloop_timeval);
ioloop_time = ioloop_timeval.tv_sec;
for (i = 0; i < ret; i++) {
io = (void *)events[i].udata;
i_assert(io->refcount >= 1);
io->refcount++;
}
for (i = 0; i < ret; i++) {
io = (void *)events[i].udata;
/* there can be multiple events for a single io.
call the callback only once if that happens. */
if (io->refcount == 2 && io->io.callback != NULL)
io_loop_call_io(&io->io);
if (--io->refcount == 0)
io_loop_notify_free(ctx, io);
}
}
static struct ioloop_notify_handler_context *io_loop_notify_handler_init(void)
{
struct ioloop_notify_handler_context *ctx;
ctx = current_ioloop->notify_handler_context =
i_new(struct ioloop_notify_handler_context, 1);
ctx->kq = kqueue();
if (ctx->kq < 0)
i_fatal("kqueue(notify) failed: %m");
fd_close_on_exec(ctx->kq, TRUE);
return ctx;
}
void io_loop_notify_handler_deinit(struct ioloop *ioloop)
{
struct ioloop_notify_handler_context *ctx =
ioloop->notify_handler_context;
while (ctx->notifies != NULL) {
struct io_notify *io = ctx->notifies;
struct io *_io = &io->io;
i_warning("I/O notify leak: %p (%s:%u, fd %d)",
(void *)_io->callback,
_io->source_filename,
_io->source_linenum, io->fd);
io_remove(&_io);
}
io_remove(&ctx->event_io);
if (close(ctx->kq) < 0)
i_error("close(kqueue notify) failed: %m");
i_free(ctx);
}
#undef io_add_notify
enum io_notify_result
io_add_notify(const char *path, const char *source_filename,
unsigned int source_linenum,
io_callback_t *callback, void *context, struct io **io_r)
{
struct ioloop_notify_handler_context *ctx =
current_ioloop->notify_handler_context;
struct kevent ev;
struct io_notify *io;
int fd;
if (ctx == NULL)
ctx = io_loop_notify_handler_init();
fd = open(path, O_RDONLY);
if (fd == -1) {
/* ESTALE could happen with NFS. Don't bother giving an error
message then. */
if (errno != ENOENT && errno != ESTALE)
i_error("open(%s) for kq notify failed: %m", path);
return IO_NOTIFY_NOTFOUND;
}
fd_close_on_exec(fd, TRUE);
io = i_new(struct io_notify, 1);
io->io.condition = IO_NOTIFY;
io->io.source_filename = source_filename;
io->io.source_linenum = source_linenum;
io->io.callback = callback;
io->io.context = context;
io->io.ioloop = current_ioloop;
io->refcount = 1;
io->fd = fd;
/* EV_CLEAR flag is needed because the EVFILT_VNODE filter reports
event state transitions and not the current state. With this flag,
the same event is only returned once. */
MY_EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR,
NOTE_DELETE | NOTE_RENAME | NOTE_WRITE | NOTE_EXTEND |
NOTE_REVOKE, 0, io);
if (kevent(ctx->kq, &ev, 1, NULL, 0, NULL) < 0) {
i_error("kevent(%d, %s) for notify failed: %m", fd, path);
i_close_fd(&fd);
i_free(io);
return IO_NOTIFY_NOSUPPORT;
}
if (ctx->event_io == NULL) {
ctx->event_io = io_add(ctx->kq, IO_READ, event_callback,
io->io.ioloop->notify_handler_context);
}
DLLIST_PREPEND(&ctx->notifies, io);
*io_r = &io->io;
return IO_NOTIFY_ADDED;
}
void io_loop_notify_remove(struct io *_io)
{
struct ioloop_notify_handler_context *ctx =
_io->ioloop->notify_handler_context;
struct io_notify *io = (struct io_notify *)_io;
struct kevent ev;
MY_EV_SET(&ev, io->fd, EVFILT_VNODE, EV_DELETE, 0, 0, NULL);
if (kevent(ctx->kq, &ev, 1, NULL, 0, 0) < 0)
i_error("kevent(%d) for notify remove failed: %m", io->fd);
if (close(io->fd) < 0)
i_error("close(%d) for notify remove failed: %m", io->fd);
io->fd = -1;
if (--io->refcount == 0)
io_loop_notify_free(ctx, io);
}
int io_loop_extract_notify_fd(struct ioloop *ioloop)
{
struct ioloop_notify_handler_context *ctx =
ioloop->notify_handler_context;
struct io_notify *io;
int fd, new_kq;
if (ctx == NULL || ctx->kq == -1)
return -1;
new_kq = kqueue();
if (new_kq < 0) {
i_error("kqueue(notify) failed: %m");
return -1;
}
for (io = ctx->notifies; io != NULL; io = io->next)
io->fd = -1;
io_remove(&ctx->event_io);
fd = ctx->kq;
ctx->kq = new_kq;
return fd;
}
#endif
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