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09c684b2d5
nginx/src/event/ngx_event.h
Igor Sysoev 09c684b2d5 nginx-0.3.8-RELEASE import 
*) Security: nginx now checks URI got from a backend in
       "X-Accel-Redirect" header line or in SSI file for the "/../" paths
       and zeroes.

    *) Change: nginx now does not treat the empty user name in the
       "Authorization" header line as valid one.

    *) Feature: the "ssl_session_timeout" directives of the
       ngx_http_ssl_module and ngx_imap_ssl_module.

    *) Feature: the "auth_http_header" directive of the
       ngx_imap_auth_http_module.

    *) Feature: the "add_header" directive.

    *) Feature: the ngx_http_realip_module.

    *) Feature: the new variables to use in the "log_format" directive:
       $bytes_sent, $apache_bytes_sent, $status, $time_gmt, $uri,
       $request_time, $request_length, $upstream_status,
       $upstream_response_time, $gzip_ratio, $uid_got, $uid_set,
       $connection, $pipe, and $msec. The parameters in the "%name" form
       will be canceled soon.

    *) Change: now the false variable values in the "if" directive are the
       empty string "" and string starting with "0".

    *) Bugfix: while using proxied or FastCGI-server nginx may leave
       connections and temporary files with client requests in open state.

    *) Bugfix: the worker processes did not flush the buffered logs on
       graceful exit.

    *) Bugfix: if the request URI was changes by the "rewrite" directive
       and the request was proxied in location given by regular expression,
       then the incorrect request was transferred to backend; the bug had
       appeared in 0.2.6.

    *) Bugfix: the "expires" directive did not remove the previous
       "Expires" header.

    *) Bugfix: nginx may stop to accept requests if the "rtsig" method and
       several worker processes were used.

    *) Bugfix: the "\"" and "\'" escape symbols were incorrectly handled in
       SSI commands.

    *) Bugfix: if the response was ended just after the SSI command and
       gzipping was used, then the response did not transferred complete or
       did not transferred at all.
2005-11-09 17:25:55 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#ifndef _NGX_EVENT_H_INCLUDED_
#define _NGX_EVENT_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#define NGX_INVALID_INDEX 0xd0d0d0d0
#if (NGX_HAVE_IOCP)
typedef struct {
WSAOVERLAPPED ovlp;
ngx_event_t *event;
int error;
} ngx_event_ovlp_t;
#endif
typedef struct {
ngx_uint_t lock;
ngx_event_t *events;
ngx_event_t *last;
} ngx_event_mutex_t;
struct ngx_event_s {
void *data;
unsigned write:1;
unsigned accept:1;
unsigned oneshot:1;
/* used to detect the stale events in kqueue, rt signals and epoll */
unsigned instance:1;
/*
* the event was passed or would be passed to a kernel;
* in aio mode - operation was posted.
*/
unsigned active:1;
unsigned disabled:1;
/* the ready event; in aio mode 0 means that no operation can be posted */
unsigned ready:1;
/* aio operation is complete */
unsigned complete:1;
unsigned eof:1;
unsigned error:1;
unsigned timedout:1;
unsigned timer_set:1;
unsigned delayed:1;
unsigned read_discarded:1;
unsigned unexpected_eof:1;
unsigned deferred_accept:1;
/* the pending eof reported by kqueue or in aio chain operation */
unsigned pending_eof:1;
#if !(NGX_THREADS)
unsigned posted_ready:1;
#endif
#if (NGX_WIN32)
/* setsockopt(SO_UPDATE_ACCEPT_CONTEXT) was succesfull */
unsigned accept_context_updated:1;
#endif
#if (NGX_HAVE_KQUEUE)
unsigned kq_vnode:1;
/* the pending errno reported by kqueue */
int kq_errno;
#endif
/*
* kqueue only:
* accept: number of sockets that wait to be accepted
* read: bytes to read when event is ready
* or lowat when event is set with NGX_LOWAT_EVENT flag
* write: available space in buffer when event is ready
* or lowat when event is set with NGX_LOWAT_EVENT flag
*
* iocp: TODO
*
* otherwise:
* accept: 1 if accept many, 0 otherwise
*/
#if (NGX_HAVE_KQUEUE) || (NGX_HAVE_IOCP)
int available;
#else
unsigned available:1;
#endif
ngx_event_handler_pt handler;
#if (NGX_HAVE_AIO)
#if (NGX_HAVE_IOCP)
ngx_event_ovlp_t ovlp;
#else
struct aiocb aiocb;
#endif
#endif
u_int index;
ngx_log_t *log;
ngx_rbtree_node_t timer;
unsigned closed:1;
/* to test on worker exit */
unsigned channel:1;
#if (NGX_THREADS)
unsigned locked:1;
unsigned posted_ready:1;
unsigned posted_timedout:1;
unsigned posted_eof:1;
#if (NGX_HAVE_KQUEUE)
/* the pending errno reported by kqueue */
int posted_errno;
#endif
#if (NGX_HAVE_KQUEUE) || (NGX_HAVE_IOCP)
int posted_available;
#else
unsigned posted_available:1;
#endif
ngx_atomic_t *lock;
ngx_atomic_t *own_lock;
#endif
/* the links of the posted queue */
ngx_event_t *next;
ngx_event_t **prev;
#if 0
/* the threads support */
/*
* the event thread context, we store it here
* if $(CC) does not understand __thread declaration
* and pthread_getspecific() is too costly
*/
void *thr_ctx;
#if (NGX_EVENT_T_PADDING)
/* event should not cross cache line in SMP */
int padding[NGX_EVENT_T_PADDING];
#endif
#endif
};
typedef struct {
ngx_int_t (*add)(ngx_event_t *ev, int event, u_int flags);
ngx_int_t (*del)(ngx_event_t *ev, int event, u_int flags);
ngx_int_t (*enable)(ngx_event_t *ev, int event, u_int flags);
ngx_int_t (*disable)(ngx_event_t *ev, int event, u_int flags);
ngx_int_t (*add_conn)(ngx_connection_t *c);
ngx_int_t (*del_conn)(ngx_connection_t *c, u_int flags);
ngx_int_t (*process_changes)(ngx_cycle_t *cycle, ngx_uint_t nowait);
ngx_int_t (*process_events)(ngx_cycle_t *cycle, ngx_msec_t timer,
ngx_uint_t flags);
ngx_int_t (*init)(ngx_cycle_t *cycle, ngx_msec_t timer);
void (*done)(ngx_cycle_t *cycle);
} ngx_event_actions_t;
extern ngx_event_actions_t ngx_event_actions;
/*
* The event filter requires to read/write the whole data:
* select, poll, /dev/poll, kqueue, epoll.
*/
#define NGX_USE_LEVEL_EVENT 0x00000001
/*
* The event filter is deleted after a notification without an additional
* syscall: kqueue, epoll, Solaris 10's event ports.
*/
#define NGX_USE_ONESHOT_EVENT 0x00000002
/*
* The event filter notifies only the changes and an initial level:
* kqueue, epoll.
*/
#define NGX_USE_CLEAR_EVENT 0x00000004
/*
* The event filter has kqueue features: the eof flag, errno,
* available data, etc.
*/
#define NGX_USE_KQUEUE_EVENT 0x00000008
/*
* The event filter supports low water mark: kqueue's NOTE_LOWAT.
* kqueue in FreeBSD 4.1-4.2 has no NOTE_LOWAT so we need a separate flag.
*/
#define NGX_USE_LOWAT_EVENT 0x00000010
/*
* The event filter requires to do i/o operation until EAGAIN:
* epoll, rt signals.
*/
#define NGX_USE_GREEDY_EVENT 0x00000020
/*
* The event filter is epoll.
*/
#define NGX_USE_EPOLL_EVENT 0x00000040
/*
* No need to add or delete the event filters: rt signals.
*/
#define NGX_USE_RTSIG_EVENT 0x00000080
/*
* No need to add or delete the event filters: overlapped, aio_read,
* aioread, io_submit.
*/
#define NGX_USE_AIO_EVENT 0x00000100
/*
* Need to add socket or handle only once: i/o completion port.
* It also requires NGX_HAVE_AIO and NGX_USE_AIO_EVENT to be set.
*/
#define NGX_USE_IOCP_EVENT 0x00000200
/*
* The event filter has no opaque data and requires file descriptors table:
* poll, /dev/poll, rt signals.
*/
#define NGX_USE_FD_EVENT 0x00000400
/*
* The event module handles periodic or absolute timer event by itself:
* kqueue in FreeBSD 4.4 and NetBSD 2.0, Solaris 10's event ports.
*/
#define NGX_USE_TIMER_EVENT 0x00000800
/*
* The event filter is deleted before the closing file.
* Has no meaning for select, poll, epoll.
*
* kqueue: kqueue deletes event filters for file that closed
* so we need only to delete filters in user-level batch array
* /dev/poll: we need to flush POLLREMOVE event before closing file
*/
#define NGX_CLOSE_EVENT 1
#define NGX_DISABLE_EVENT 2
/* these flags have a meaning only for kqueue */
#define NGX_LOWAT_EVENT 0
#define NGX_VNODE_EVENT 0
#if (NGX_HAVE_KQUEUE)
#define NGX_READ_EVENT EVFILT_READ
#define NGX_WRITE_EVENT EVFILT_WRITE
#undef NGX_VNODE_EVENT
#define NGX_VNODE_EVENT EVFILT_VNODE
/*
* NGX_CLOSE_EVENT and NGX_LOWAT_EVENT are the module flags and they would
* not go into a kernel so we need to choose the value that would not interfere
* with any existent and future kqueue flags. kqueue has such values -
* EV_FLAG1, EV_EOF and EV_ERROR. They are reserved and cleared on a kernel
* entrance.
*/
#undef NGX_CLOSE_EVENT
#define NGX_CLOSE_EVENT EV_EOF
#undef NGX_LOWAT_EVENT
#define NGX_LOWAT_EVENT EV_FLAG1
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT EV_ONESHOT
#define NGX_CLEAR_EVENT EV_CLEAR
#undef NGX_DISABLE_EVENT
#define NGX_DISABLE_EVENT EV_DISABLE
#elif (NGX_HAVE_DEVPOLL)
#define NGX_READ_EVENT POLLIN
#define NGX_WRITE_EVENT POLLOUT
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT 1
#elif (NGX_HAVE_EPOLL)
#define NGX_READ_EVENT EPOLLIN
#define NGX_WRITE_EVENT EPOLLOUT
#define NGX_LEVEL_EVENT 0
#define NGX_CLEAR_EVENT EPOLLET
#define NGX_ONESHOT_EVENT 0x70000000
#if 0
#define NGX_ONESHOT_EVENT EPOLLONESHOT
#endif
#elif (NGX_HAVE_POLL)
#define NGX_READ_EVENT POLLIN
#define NGX_WRITE_EVENT POLLOUT
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT 1
#else /* select */
#define NGX_READ_EVENT 0
#define NGX_WRITE_EVENT 1
#define NGX_LEVEL_EVENT 0
#define NGX_ONESHOT_EVENT 1
#endif /* NGX_HAVE_KQUEUE */
#if (NGX_HAVE_IOCP)
#define NGX_IOCP_ACCEPT 0
#define NGX_IOCP_IO 1
#define NGX_IOCP_CONNECT 2
#endif
#ifndef NGX_CLEAR_EVENT
#define NGX_CLEAR_EVENT 0 /* dummy declaration */
#endif
#define ngx_process_changes ngx_event_actions.process_changes
#define ngx_process_events ngx_event_actions.process_events
#define ngx_done_events ngx_event_actions.done
#define ngx_add_event ngx_event_actions.add
#define ngx_del_event ngx_event_actions.del
#define ngx_add_conn ngx_event_actions.add_conn
#define ngx_del_conn ngx_event_actions.del_conn
#define ngx_add_timer ngx_event_add_timer
#define ngx_del_timer ngx_event_del_timer
extern ngx_os_io_t ngx_io;
#define ngx_recv ngx_io.recv
#define ngx_recv_chain ngx_io.recv_chain
#define ngx_send ngx_io.send
#define ngx_send_chain ngx_io.send_chain
#define NGX_EVENT_MODULE 0x544E5645 /* "EVNT" */
#define NGX_EVENT_CONF 0x02000000
typedef struct {
ngx_uint_t connections;
ngx_uint_t use;
ngx_flag_t multi_accept;
ngx_flag_t accept_mutex;
ngx_msec_t accept_mutex_delay;
u_char *name;
#if (NGX_DEBUG)
ngx_array_t debug_connection;
#endif
} ngx_event_conf_t;
typedef struct {
ngx_str_t *name;
void *(*create_conf)(ngx_cycle_t *cycle);
char *(*init_conf)(ngx_cycle_t *cycle, void *conf);
ngx_event_actions_t actions;
} ngx_event_module_t;
extern ngx_atomic_t *ngx_connection_counter;
extern ngx_atomic_t *ngx_accept_mutex_ptr;
extern ngx_atomic_t *ngx_accept_mutex_last_owner;
extern ngx_atomic_t *ngx_accept_mutex;
extern ngx_uint_t ngx_accept_mutex_held;
extern ngx_msec_t ngx_accept_mutex_delay;
extern ngx_int_t ngx_accept_disabled;
#if (NGX_STAT_STUB)
extern ngx_atomic_t *ngx_stat_accepted;
extern ngx_atomic_t *ngx_stat_handled;
extern ngx_atomic_t *ngx_stat_requests;
extern ngx_atomic_t *ngx_stat_active;
extern ngx_atomic_t *ngx_stat_reading;
extern ngx_atomic_t *ngx_stat_writing;
#endif
#define NGX_UPDATE_TIME 1
#define NGX_POST_EVENTS 2
#define NGX_POST_THREAD_EVENTS 4
extern sig_atomic_t ngx_event_timer_alarm;
extern ngx_uint_t ngx_event_flags;
extern ngx_module_t ngx_events_module;
extern ngx_module_t ngx_event_core_module;
#define ngx_event_get_conf(conf_ctx, module) \
(*(ngx_get_conf(conf_ctx, ngx_events_module))) [module.ctx_index];
void ngx_event_accept(ngx_event_t *ev);
ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle);
u_char *ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len);
void ngx_process_events_and_timers(ngx_cycle_t *cycle);
ngx_int_t ngx_handle_read_event(ngx_event_t *rev, u_int flags);
ngx_int_t ngx_handle_write_event(ngx_event_t *wev, size_t lowat);
#if (NGX_WIN32)
void ngx_event_acceptex(ngx_event_t *ev);
ngx_int_t ngx_event_post_acceptex(ngx_listening_t *ls, ngx_uint_t n);
u_char *ngx_acceptex_log_error(ngx_log_t *log, u_char *buf, size_t len);
#endif
ngx_int_t ngx_send_lowat(ngx_connection_t *c, size_t lowat);
/* used in ngx_log_debugX() */
#define ngx_event_ident(p) ((ngx_connection_t *) (p))->fd
#include <ngx_event_timer.h>
#include <ngx_event_posted.h>
#include <ngx_event_busy_lock.h>
#if (NGX_WIN32)
#include <ngx_iocp_module.h>
#endif
#endif /* _NGX_EVENT_H_INCLUDED_ */
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