/* * include/types/fd.h * File descriptors states - check src/fd.c for explanations. * * Copyright (C) 2000-2014 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 #include #include /* Direction for each FD event update */ enum { DIR_RD=0, DIR_WR=1, }; /* Polling status flags returned in fdtab[].ev : * FD_POLL_IN remains set as long as some data is pending for read. * FD_POLL_OUT remains set as long as the fd accepts to write data. * FD_POLL_ERR and FD_POLL_ERR remain set forever (until processed). */ #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_DATA (FD_POLL_IN | FD_POLL_OUT) #define FD_POLL_STICKY (FD_POLL_ERR | FD_POLL_HUP) #define FD_EV_ACTIVE 1U #define FD_EV_READY 2U #define FD_EV_POLLED 4U #define FD_EV_STATUS (FD_EV_ACTIVE | FD_EV_POLLED | FD_EV_READY) #define FD_EV_STATUS_R (FD_EV_STATUS) #define FD_EV_STATUS_W (FD_EV_STATUS << 4) #define FD_EV_POLLED_R (FD_EV_POLLED) #define FD_EV_POLLED_W (FD_EV_POLLED << 4) #define FD_EV_POLLED_RW (FD_EV_POLLED_R | FD_EV_POLLED_W) #define FD_EV_ACTIVE_R (FD_EV_ACTIVE) #define FD_EV_ACTIVE_W (FD_EV_ACTIVE << 4) #define FD_EV_ACTIVE_RW (FD_EV_ACTIVE_R | FD_EV_ACTIVE_W) #define FD_EV_READY_R (FD_EV_READY) #define FD_EV_READY_W (FD_EV_READY << 4) #define FD_EV_READY_RW (FD_EV_READY_R | FD_EV_READY_W) enum fd_states { FD_ST_DISABLED = 0, FD_ST_MUSTPOLL, FD_ST_STOPPED, FD_ST_ACTIVE, FD_ST_ABORT, FD_ST_POLLED, FD_ST_PAUSED, FD_ST_READY }; /* This is the value used to mark a file descriptor as dead. This value is * negative, this is important so that tests on fd < 0 properly match. It * also has the nice property of being highly negative but not overflowing * nor changing sign on 32-bit machines when multipled by sizeof(fdtab). * This ensures that any unexpected dereference of such an uninitialized * file descriptor will lead to so large a dereference that it will crash * the process at the exact location of the bug with a clean stack trace * instead of causing silent manipulation of other FDs. And it's readable * when found in a dump. */ #define DEAD_FD_MAGIC 0xFDDEADFD /* fdlist_entry: entry used by the fd cache. * >= 0 means we're in the cache and gives the FD of the next in the cache, * -1 means we're in the cache and the last element, * -2 means the entry is locked, * <= -3 means not in the cache, and next element is -4-fd * * It must remain 8-aligned so that aligned CAS operations may be done on both * entries at once. */ struct fdlist_entry { int next; int prev; } __attribute__ ((aligned(8))); /* head of the fd cache */ struct fdlist { int first; int last; } __attribute__ ((aligned(8))); /* info about one given fd */ struct fdtab { __decl_hathreads(HA_SPINLOCK_T lock); unsigned long thread_mask; /* mask of thread IDs authorized to process the task */ unsigned long update_mask; /* mask of thread IDs having an update for fd */ struct fdlist_entry cache; /* Entry in the fdcache */ struct fdlist_entry update; /* Entry in the global update list */ void (*iocb)(int fd); /* I/O handler */ void *owner; /* the connection or listener associated with this fd, NULL if closed */ unsigned char state; /* FD state for read and write directions (2*3 bits) */ unsigned char ev; /* event seen in return of poll() : FD_POLL_* */ unsigned char linger_risk:1; /* 1 if we must kill lingering before closing */ unsigned char cloned:1; /* 1 if a cloned socket, requires EPOLL_CTL_DEL on close */ }; /* less often used information */ struct fdinfo { struct port_range *port_range; /* optional port range to bind to */ int local_port; /* optional local port */ }; /* * Poller descriptors. * - is initialized by the poller's register() function, and should not * be allocated, just linked to. * - 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. * - is initialized by the poller's init() function, and cleaned by * the term() function. * - clo() should be used to do indicate the poller that fd will be closed. * - poll() calls the poller, expiring at * - flags indicate what the poller supports (HAP_POLL_F_*) */ #define HAP_POLL_F_RDHUP 0x00000001 /* the poller notifies of HUP with reads */ struct poller { void *private; /* any private data for the poller */ void REGPRM1 (*clo)(const int fd); /* mark as closed */ void REGPRM2 (*poll)(struct poller *p, int 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 */ unsigned int flags; /* HAP_POLL_F_* */ 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 struct fdinfo *fdinfo; /* less-often used infos for file descriptors */ 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: */