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https://github.com/haproxy/haproxy.git
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6db06d3870
send() supports the MSG_MORE flag on Linux, which does the same as TCP_CORK except that we don't have to remove TCP_NODELAY before and we don't need any syscall to set/remove it. This can save up to 4 syscalls around a send() (two for setting it, two for removing it), and it's much cleaner since it is not persistent. So make use of it instead.
137 lines
5.5 KiB
C
137 lines
5.5 KiB
C
/*
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include/types/fd.h
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File descriptors states.
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Copyright (C) 2000-2008 Willy Tarreau - w@1wt.eu
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, version 2.1
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exclusively.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_FD_H
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#define _TYPES_FD_H
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <common/config.h>
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#include <types/task.h>
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#include <types/protocols.h>
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/* different possible states for the fd */
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#define FD_STCLOSE 0
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#define FD_STLISTEN 1
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#define FD_STCONN 2
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#define FD_STREADY 3
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#define FD_STERROR 4
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enum {
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DIR_RD=0,
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DIR_WR=1,
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DIR_SIZE
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};
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/*
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* FD_POLL_IN remains set as long as some data is pending for read.
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* FD_POLL_OUT remains set as long as the fd accepts to write data.
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* FD_POLL_ERR and FD_POLL_ERR remain set forever (until processed).
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*/
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#define FD_POLL_IN 0x01
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#define FD_POLL_PRI 0x02
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#define FD_POLL_OUT 0x04
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#define FD_POLL_ERR 0x08
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#define FD_POLL_HUP 0x10
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#define FD_POLL_DATA (FD_POLL_IN | FD_POLL_OUT)
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#define FD_POLL_STICKY (FD_POLL_ERR | FD_POLL_HUP)
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/* bit values for fdtab[fd]->flags. Most of them are used to hold a value
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* consecutive to a behaviour change.
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*/
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#define FD_FL_TCP 0x0001 /* socket is TCP */
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#define FD_FL_TCP_NODELAY 0x0002
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#define FD_FL_TCP_NOLING 0x0004 /* lingering disabled */
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/* info about one given fd */
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struct fdtab {
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struct {
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int (*f)(int fd); /* read/write function */
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struct buffer *b; /* read/write buffer */
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} cb[DIR_SIZE];
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void *owner; /* the session (or proxy) associated with this fd */
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unsigned short flags; /* various flags precising the exact status of this fd */
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unsigned char state; /* the state of this fd */
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unsigned char ev; /* event seen in return of poll() : FD_POLL_* */
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struct sockaddr *peeraddr; /* pointer to peer's network address, or NULL if unset */
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socklen_t peerlen; /* peer's address length, or 0 if unset */
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int local_port; /* optional local port */
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struct port_range *port_range; /* optional port range to bind to */
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};
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/*
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* Poller descriptors.
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* - <name> is initialized by the poller's register() function, and should not
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* be allocated, just linked to.
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* - <pref> is initialized by the poller's register() function. It is set to 0
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* by default, meaning the poller is disabled. init() should set it to 0 in
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* case of failure. term() must set it to 0. A generic unoptimized select()
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* poller should set it to 100.
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* - <private> is initialized by the poller's init() function, and cleaned by
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* the term() function.
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* - cond_s() checks if fd was not set then sets it and returns 1. Otherwise
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* it returns 0. It may be the same as set().
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* - cond_c() checks if fd was set then clears it and returns 1. Otherwise
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* it returns 0. It may be the same as clr().
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* - clo() should be used to do indicate the poller that fd will be closed. It
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* may be the same as rem() on some pollers.
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* - poll() calls the poller, expiring at <exp>
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*/
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struct poller {
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void *private; /* any private data for the poller */
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int REGPRM2 (*is_set)(const int fd, int dir); /* check if <fd> is being polled for dir <dir> */
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int REGPRM2 (*set)(const int fd, int dir); /* set polling on <fd> for <dir> */
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int REGPRM2 (*clr)(const int fd, int dir); /* clear polling on <fd> for <dir> */
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int REGPRM2 (*cond_s)(const int fd, int dir); /* set polling on <fd> for <dir> if unset */
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int REGPRM2 (*cond_c)(const int fd, int dir); /* clear polling on <fd> for <dir> if set */
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void REGPRM1 (*rem)(const int fd); /* remove any polling on <fd> */
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void REGPRM1 (*clo)(const int fd); /* mark <fd> as closed */
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void REGPRM2 (*poll)(struct poller *p, int exp); /* the poller itself */
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int REGPRM1 (*init)(struct poller *p); /* poller initialization */
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void REGPRM1 (*term)(struct poller *p); /* termination of this poller */
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int REGPRM1 (*test)(struct poller *p); /* pre-init check of the poller */
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int REGPRM1 (*fork)(struct poller *p); /* post-fork re-opening */
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const char *name; /* poller name */
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int pref; /* try pollers with higher preference first */
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};
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extern struct poller cur_poller; /* the current poller */
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extern int nbpollers;
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#define MAX_POLLERS 10
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extern struct poller pollers[MAX_POLLERS]; /* all registered pollers */
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extern struct fdtab *fdtab; /* array of all the file descriptors */
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extern int maxfd; /* # of the highest fd + 1 */
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extern int totalconn; /* total # of terminated sessions */
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extern int actconn; /* # of active sessions */
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#endif /* _TYPES_FD_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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