blob: a1b6e9d4d4859108d0270bad6232de52817a05e7 [file] [log] [blame]
/*
include/types/fd.h
File descriptors states.
Copyright (C) 2000-2007 Willy Tarreau - w@1wt.eu
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, version 2.1
exclusively.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _TYPES_FD_H
#define _TYPES_FD_H
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <common/config.h>
#include <types/task.h>
#include <types/buffers.h>
/* different possible states for the fd */
#define FD_STCLOSE 0
#define FD_STLISTEN 1
#define FD_STCONN 2
#define FD_STREADY 3
#define FD_STERROR 4
enum {
DIR_RD=0,
DIR_WR=1,
DIR_SIZE
};
#define FD_POLL_IN 0x01
#define FD_POLL_PRI 0x02
#define FD_POLL_OUT 0x04
#define FD_POLL_ERR 0x08
#define FD_POLL_HUP 0x10
#define FD_POLL_ANY 0x1F
#define FD_POLL_RD (FD_POLL_IN | FD_POLL_ERR | FD_POLL_HUP)
#define FD_POLL_WR (FD_POLL_OUT | FD_POLL_ERR | FD_POLL_HUP)
/* info about one given fd */
struct fdtab {
struct {
int (*f)(int fd); /* read/write function */
struct buffer *b; /* read/write buffer */
} cb[DIR_SIZE];
struct task *owner; /* the session (or proxy) associated with this fd */
unsigned char state; /* the state of this fd */
unsigned char ev; /* event seen in return of poll() : FD_POLL_* */
};
/*
* Poller descriptors.
* - <name> is initialized by the poller's register() function, and should not
* be allocated, just linked to.
* - <pref> is initialized by the poller's register() function. It is set to 0
* by default, meaning the poller is disabled. init() should set it to 0 in
* case of failure. term() must set it to 0. A generic unoptimized select()
* poller should set it to 100.
* - <private> is initialized by the poller's init() function, and cleaned by
* the term() function.
* - cond_s() checks if fd was not set then sets it and returns 1. Otherwise
* it returns 0. It may be the same as set().
* - cond_c() checks if fd was set then clears it and returns 1. Otherwise
* it returns 0. It may be the same as clr().
* - clo() should be used to do indicate the poller that fd will be closed. It
* may be the same as rem() on some pollers.
* - poll() calls the poller, expiring at <exp>
*/
struct poller {
void *private; /* any private data for the poller */
int REGPRM2 (*is_set)(const int fd, int dir); /* check if <fd> is being polled for dir <dir> */
int REGPRM2 (*set)(const int fd, int dir); /* set polling on <fd> for <dir> */
int REGPRM2 (*clr)(const int fd, int dir); /* clear polling on <fd> for <dir> */
int REGPRM2 (*cond_s)(const int fd, int dir); /* set polling on <fd> for <dir> if unset */
int REGPRM2 (*cond_c)(const int fd, int dir); /* clear polling on <fd> for <dir> if set */
void REGPRM1 (*rem)(const int fd); /* remove any polling on <fd> */
void REGPRM1 (*clo)(const int fd); /* mark <fd> as closed */
void REGPRM2 (*poll)(struct poller *p, struct timeval *exp); /* the poller itself */
int REGPRM1 (*init)(struct poller *p); /* poller initialization */
void REGPRM1 (*term)(struct poller *p); /* termination of this poller */
int REGPRM1 (*test)(struct poller *p); /* pre-init check of the poller */
int REGPRM1 (*fork)(struct poller *p); /* post-fork re-opening */
const char *name; /* poller name */
int pref; /* try pollers with higher preference first */
};
extern struct poller cur_poller; /* the current poller */
extern int nbpollers;
#define MAX_POLLERS 10
extern struct poller pollers[MAX_POLLERS]; /* all registered pollers */
extern struct fdtab *fdtab; /* array of all the file descriptors */
extern int maxfd; /* # of the highest fd + 1 */
extern int totalconn; /* total # of terminated sessions */
extern int actconn; /* # of active sessions */
#endif /* _TYPES_FD_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/