2013-02-09 21:54:23 +00:00
|
|
|
.\" Copyright (C) 2006 Red Hat, Inc. All rights reserved.
|
2013-03-12 10:54:09 +00:00
|
|
|
.\" Author: Ulrich Drepper <drepper@redhat.com>
|
2013-02-09 21:54:23 +00:00
|
|
|
.\"
|
2013-03-10 09:29:21 +00:00
|
|
|
.\" %%%LICENSE_START(GPLv2_MISC)
|
2013-02-09 21:54:23 +00:00
|
|
|
.\" This copyrighted material is made available to anyone wishing to use,
|
|
|
|
.\" modify, copy, or redistribute it subject to the terms and conditions of the
|
|
|
|
.\" GNU General Public License v.2.
|
|
|
|
.\"
|
|
|
|
.\" This program 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 General Public License for
|
|
|
|
.\" more details.
|
|
|
|
.\"
|
getent.1, _syscall.2, acct.2, adjtimex.2, bdflush.2, brk.2, cacheflush.2, getsid.2, getxattr.2, inotify_add_watch.2, inotify_init.2, inotify_rm_watch.2, ioperm.2, ipc.2, listxattr.2, mlock.2, modify_ldt.2, mremap.2, nanosleep.2, outb.2, ptrace.2, removexattr.2, sched_get_priority_max.2, sched_rr_get_interval.2, sched_setaffinity.2, sched_setparam.2, sched_setscheduler.2, sched_yield.2, setsid.2, setxattr.2, socketcall.2, unimplemented.2, aio_cancel.3, aio_error.3, aio_fsync.3, aio_read.3, aio_return.3, aio_suspend.3, aio_write.3, cfree.3, crypt.3, dlopen.3, errno.3, fenv.3, ftime.3, ftw.3, getgrent_r.3, getpass.3, getpwent_r.3, getutent.3, hsearch.3, lio_listio.3, login.3, longjmp.3, perror.3, printf.3, scandirat.3, setjmp.3, strfmon.3, strtoimax.3, termios.3, ttyname.3, ualarm.3, wcstoimax.3, wordexp.3, console_ioctl.4, dsp56k.4, fd.4, hd.4, intro.4, lp.4, mem.4, null.4, ram.4, rtc.4, sk98lin.4, tty.4, ttyS.4, vcs.4, charmap.5, filesystems.5, ftpusers.5, gai.conf.5, group.5, host.conf.5, hosts.5, intro.5, issue.5, locale.5, motd.5, networks.5, nologin.5, nscd.conf.5, nss.5, nsswitch.conf.5, passwd.5, proc.5, protocols.5, securetty.5, shells.5, termcap.5, ttytype.5, utmp.5, intro.6, armscii-8.7, ascii.7, bootparam.7, cp1251.7, cpuset.7, environ.7, glob.7, intro.7, iso_8859-1.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-15.7, iso_8859-16.7, iso_8859-2.7, iso_8859-3.7, iso_8859-4.7, iso_8859-5.7, iso_8859-6.7, iso_8859-7.7, iso_8859-8.7, iso_8859-9.7, koi8-r.7, koi8-u.7, posixoptions.7, standards.7, unicode.7, utf-8.7, intro.8, ldconfig.8, nscd.8: Global fix: Update info in source comments on where to get a copy of the GPL
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:43 +00:00
|
|
|
.\" You should have received a copy of the GNU General Public
|
|
|
|
.\" License along with this manual; if not, see
|
|
|
|
.\" <http://www.gnu.org/licenses/>.
|
epoll_create.2, epoll_ctl.2, epoll_wait.2, eventfd.2, fallocate.2, futex.2, getcpu.2, getitimer.2, ioctl_list.2, ioprio_set.2, migrate_pages.2, move_pages.2, pciconfig_read.2, sendfile.2, setns.2, signalfd.2, spu_create.2, spu_run.2, sysinfo.2, timerfd_create.2, backtrace.3, cmsg.3, error.3, getpt.3, getrpcent.3, getrpcport.3, getsubopt.3, offsetof.3, program_invocation_name.3, rpc.3, rpmatch.3, rtnetlink.3, xdr.3, cciss.4, hpsa.4, pts.4, charmap.5, dir_colors.5, elf.5, gai.conf.5, locale.5, nscd.conf.5, nss.5, resolv.conf.5, rpc.5, arp.7, cpuset.7, ddp.7, epoll.7, fifo.7, futex.7, icmp.7, ip.7, ipv6.7, mailaddr.7, netdevice.7, packet.7, raw.7, regex.7, rtnetlink.7, socket.7, spufs.7, tcp.7, udp.7, unix.7, x25.7, ldconfig.8, nscd.8: Global fix: s/END_LICENSE/LICENSE_END/
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-12 09:26:07 +00:00
|
|
|
.\" %%%LICENSE_END
|
2013-02-09 21:54:23 +00:00
|
|
|
.\"
|
2013-03-01 13:27:07 +00:00
|
|
|
.TH GAI.CONF 5 2013-02-13 "Linux" "Linux Programmer's Manual"
|
2013-02-09 21:54:23 +00:00
|
|
|
.SH NAME
|
|
|
|
gai.conf \- getaddrinfo(3) configuration file
|
|
|
|
.SH DESCRIPTION
|
|
|
|
A call to
|
|
|
|
.BR getaddrinfo (3)
|
2013-02-09 22:03:46 +00:00
|
|
|
might return multiple answers.
|
|
|
|
According to RFC\ 3484 these answers must be sorted so that
|
|
|
|
the answer with the highest success rate is first in the list.
|
|
|
|
The RFC provides an algorithm for the sorting.
|
|
|
|
The static rules are not always adequate, though.
|
|
|
|
For this reason,
|
|
|
|
the RFC also requires that system administrators should have the possibility
|
|
|
|
to dynamically change the sorting.
|
|
|
|
For the glibc implementation, this can be achieved with the
|
|
|
|
.IR /etc/gai.conf
|
2013-02-09 21:54:23 +00:00
|
|
|
file.
|
|
|
|
.PP
|
2013-02-09 22:03:46 +00:00
|
|
|
Each line in the configuration file consists of a keyword and its parameters.
|
|
|
|
White spaces in any place are ignored.
|
|
|
|
Lines starting with \(aq#\(aq are comments and are ignored.
|
2013-02-09 21:54:23 +00:00
|
|
|
.PP
|
|
|
|
The keywords currently recognized are:
|
|
|
|
.TP
|
|
|
|
\fBlabel\fR \fInetmask\fR \fIprecedence\fR
|
2013-02-09 22:03:46 +00:00
|
|
|
The value is added to the label table used in the RFC\ 3484 sorting.
|
2013-02-09 21:54:23 +00:00
|
|
|
If any \fBlabel\fR definition is present in the configuration file
|
2013-02-09 22:03:46 +00:00
|
|
|
is present, the default table is not used.
|
|
|
|
All the label definitions
|
2013-02-09 21:54:23 +00:00
|
|
|
of the default table which are to be maintained have to be duplicated.
|
2013-02-09 22:03:46 +00:00
|
|
|
Following the keyword,
|
|
|
|
the line has to contain a network mask and a label value.
|
2013-02-09 21:54:23 +00:00
|
|
|
.TP
|
|
|
|
\fBprecedence\fR \fInetmask\fR \fIprecedence\fR
|
2014-05-11 07:04:13 +00:00
|
|
|
This keyword is similar to \fBlabel\fR, but instead the value is added
|
2013-02-09 22:03:46 +00:00
|
|
|
to the precedence table as specified in RFC\ 3484.
|
|
|
|
Once again, the
|
2013-02-09 21:54:23 +00:00
|
|
|
presence of a single \fBprecedence\fR line in the configuration file
|
|
|
|
causes the default table to not be used.
|
|
|
|
.TP
|
|
|
|
\fBreload\fR <\fByes\fR|\fBno\fR>
|
2013-02-09 22:03:46 +00:00
|
|
|
This keyword controls whether a process checks whether the configuration
|
|
|
|
file has been changed since the last time it was read.
|
|
|
|
If the value is
|
2014-03-26 04:33:40 +00:00
|
|
|
"\fByes\fR", the file is reread.
|
2013-03-10 12:04:00 +00:00
|
|
|
This might cause problems in multithreaded
|
2013-02-09 22:03:46 +00:00
|
|
|
applications and is generally a bad idea.
|
|
|
|
The default is "\fBno\fR".
|
2013-02-09 21:54:23 +00:00
|
|
|
.TP
|
|
|
|
\fBscopev4\fR \fImask\fR \fIvalue\fR
|
2013-02-09 22:03:46 +00:00
|
|
|
Add another rule to the RFC\ 3484 scope table for IPv4 address.
|
|
|
|
By default, the scope IDs described in section 3.2 in RFC\ 3438 are used.
|
2013-02-09 21:54:23 +00:00
|
|
|
Changing these defaults should hardly ever be necessary.
|
2013-02-09 22:03:46 +00:00
|
|
|
.SH FILES
|
|
|
|
\fI/etc/gai.conf\fR
|
2013-02-09 21:54:23 +00:00
|
|
|
.SH EXAMPLE
|
2013-02-09 22:03:46 +00:00
|
|
|
The default table according to RFC\ 3484 would be specified with the
|
2013-02-09 21:54:23 +00:00
|
|
|
following configuration file:
|
|
|
|
|
|
|
|
.nf
|
|
|
|
label ::1/128 0
|
|
|
|
label ::/0 1
|
|
|
|
label 2002::/16 2
|
|
|
|
label ::/96 3
|
|
|
|
label ::ffff:0:0/96 4
|
|
|
|
precedence ::1/128 50
|
|
|
|
precedence ::/0 40
|
|
|
|
precedence 2002::/16 30
|
|
|
|
precedence ::/96 20
|
|
|
|
precedence ::ffff:0:0/96 10
|
2013-02-09 22:03:46 +00:00
|
|
|
.fi
|
|
|
|
.\" .SH AUTHOR
|
|
|
|
.\" Ulrich Drepper <drepper@redhat.com>
|
2013-03-05 17:22:04 +00:00
|
|
|
.\"
|
2013-02-09 21:54:23 +00:00
|
|
|
.SH SEE ALSO
|
2014-02-10 07:08:16 +00:00
|
|
|
.BR getaddrinfo (3),
|
2013-02-09 22:03:46 +00:00
|
|
|
RFC\ 3484
|