2013-02-09 21:54:23 +00:00
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.\" Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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2013-03-12 10:54:09 +00:00
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.\" Author: Ulrich Drepper <drepper@redhat.com>
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2013-02-09 21:54:23 +00:00
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.\"
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2013-03-10 09:29:21 +00:00
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.\" %%%LICENSE_START(GPLv2_MISC)
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2013-02-09 21:54:23 +00:00
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.\" This copyrighted material is made available to anyone wishing to use,
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.\" modify, copy, or redistribute it subject to the terms and conditions of the
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.\" GNU General Public License v.2.
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.\"
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.\" This program is distributed in the hope that it will be useful, but WITHOUT
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.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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.\" more details.
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.\"
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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
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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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
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.\" %%%LICENSE_END
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2013-02-09 21:54:23 +00:00
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.\"
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iconv.1, locale.1, memusage.1, memusagestat.1, pldd.1, sprof.1, _syscall.2, add_key.2, adjtimex.2, bind.2, bpf.2, chown.2, clone.2, close.2, copy_file_range.2, eventfd.2, fanotify_init.2, fanotify_mark.2, fork.2, fsync.2, futex.2, getdents.2, getrlimit.2, getxattr.2, io_cancel.2, io_destroy.2, io_getevents.2, io_setup.2, ioctl_fat.2, ioctl_getfsmap.2, ioctl_ns.2, ioctl_tty.2, ioctl_userfaultfd.2, kcmp.2, keyctl.2, listen.2, listxattr.2, mbind.2, membarrier.2, memfd_create.2, mkdir.2, move_pages.2, mremap.2, msync.2, nfsservctl.2, open.2, perf_event_open.2, pidfd_send_signal.2, pipe.2, pivot_root.2, pkey_alloc.2, process_vm_readv.2, ptrace.2, readlink.2, readv.2, recv.2, recvmmsg.2, rename.2, request_key.2, s390_runtime_instr.2, sched_setaffinity.2, seccomp.2, send.2, sendmmsg.2, sigaltstack.2, signalfd.2, socket.2, socketpair.2, splice.2, spu_create.2, spu_run.2, statfs.2, syscall.2, sysctl.2, sysfs.2, tee.2, timer_getoverrun.2, timer_settime.2, umount.2, userfaultfd.2, utimensat.2, wait4.2, INFINITY.3, __ppc_get_timebase.3, __setfpucw.3, abort.3, aio_cancel.3, aio_error.3, aio_read.3, aio_return.3, atexit.3, backtrace.3, basename.3, bsearch.3, bswap.3, cacos.3, cacosh.3, catan.3, catanh.3, cexp2.3, clock_getcpuclockid.3, clog2.3, cmsg.3, confstr.3, div.3, dl_iterate_phdr.3, dlerror.3, dlinfo.3, dlopen.3, dlsym.3, duplocale.3, encrypt.3, end.3, endian.3, envz_add.3, err.3, expm1.3, fdim.3, flockfile.3, fmtmsg.3, frexp.3, ftw.3, get_nprocs_conf.3, get_phys_pages.3, getaddrinfo_a.3, getauxval.3, getdate.3, getdtablesize.3, getgrent_r.3, getgrouplist.3, gethostbyname.3, getline.3, getnameinfo.3, getopt.3, getprotoent_r.3, getpwent_r.3, getpwnam.3, getservent_r.3, getsubopt.3, getutent.3, glob.3, gnu_get_libc_version.3, hsearch.3, if_nameindex.3, inet.3, inet_net_pton.3, inet_ntop.3, inet_pton.3, insque.3, killpg.3, makecontext.3, mallinfo.3, malloc.3, malloc_hook.3, malloc_info.3, mallopt.3, matherr.3, mbsnrtowcs.3, mbstowcs.3, mcheck.3, mempcpy.3, mq_getattr.3, mq_notify.3, mtrace.3, newlocale.3, nextafter.3, ntp_gettime.3, offsetof.3, open_memstream.3, pow.3, printf.3, pthread_attr_init.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setstack.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_create.3, pthread_detach.3, pthread_getattr_default_np.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_mutex_consistent.3, pthread_mutexattr_setrobust.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_sigmask.3, pthread_spin_init.3, pthread_testcancel.3, pthread_tryjoin_np.3, ptsname.3, qsort.3, rand.3, random.3, remainder.3, rpmatch.3, rtime.3, rtnetlink.3, scalb.3, scalbln.3, scandir.3, sem_getvalue.3, sem_wait.3, setaliasent.3, setlogmask.3, sigwait.3, sincos.3, sockatmark.3, stdarg.3, stpcpy.3, strcat.3, strfmon.3, strptime.3, strtod.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, tsearch.3, uselocale.3, wcstok.3, wcstombs.3, wordexp.3, y0.3, loop.4, vcs.4, veth.4, charmap.5, core.5, filesystems.5, gai.conf.5, hosts.5, hosts.equiv.5, locale.5, nss.5, repertoiremap.5, securetty.5, shells.5, ttytype.5, ascii.7, complex.7, cpuset.7, credentials.7, fanotify.7, hier.7, inotify.7, ip.7, mount_namespaces.7, mq_overview.7, netlink.7, network_namespaces.7, pid_namespaces.7, pkeys.7, rtld-audit.7, rtnetlink.7, sem_overview.7, signal-safety.7, sock_diag.7, spufs.7, standards.7, symlink.7, tcp.7, time_namespaces.7, unix.7, user_namespaces.7, xattr.7, ldconfig.8: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2020-06-09 12:43:54 +00:00
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.TH GAI.CONF 5 2020-06-09 "Linux" "Linux Programmer's Manual"
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2013-02-09 21:54:23 +00:00
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.SH NAME
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gai.conf \- getaddrinfo(3) configuration file
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.SH DESCRIPTION
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A call to
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.BR getaddrinfo (3)
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2013-02-09 22:03:46 +00:00
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might return multiple answers.
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According to RFC\ 3484 these answers must be sorted so that
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the answer with the highest success rate is first in the list.
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The RFC provides an algorithm for the sorting.
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The static rules are not always adequate, though.
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For this reason,
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the RFC also requires that system administrators should have the possibility
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to dynamically change the sorting.
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For the glibc implementation, this can be achieved with the
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2019-01-30 22:35:22 +00:00
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.I /etc/gai.conf
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2013-02-09 21:54:23 +00:00
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file.
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.PP
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2013-02-09 22:03:46 +00:00
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Each line in the configuration file consists of a keyword and its parameters.
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White spaces in any place are ignored.
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Lines starting with \(aq#\(aq are comments and are ignored.
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2013-02-09 21:54:23 +00:00
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.PP
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The keywords currently recognized are:
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.TP
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\fBlabel\fR \fInetmask\fR \fIprecedence\fR
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2013-02-09 22:03:46 +00:00
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The value is added to the label table used in the RFC\ 3484 sorting.
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2015-05-06 16:36:19 +00:00
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If any \fBlabel\fR definition is present in the configuration file,
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the default table is not used.
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2013-02-09 22:03:46 +00:00
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All the label definitions
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2013-02-09 21:54:23 +00:00
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of the default table which are to be maintained have to be duplicated.
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2013-02-09 22:03:46 +00:00
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Following the keyword,
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2015-05-06 16:36:19 +00:00
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the line has to contain a network mask and a precedence value.
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2013-02-09 21:54:23 +00:00
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.TP
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\fBprecedence\fR \fInetmask\fR \fIprecedence\fR
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2014-05-11 07:04:13 +00:00
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This keyword is similar to \fBlabel\fR, but instead the value is added
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2013-02-09 22:03:46 +00:00
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to the precedence table as specified in RFC\ 3484.
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Once again, the
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2013-02-09 21:54:23 +00:00
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presence of a single \fBprecedence\fR line in the configuration file
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causes the default table to not be used.
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.TP
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\fBreload\fR <\fByes\fR|\fBno\fR>
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2013-02-09 22:03:46 +00:00
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This keyword controls whether a process checks whether the configuration
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file has been changed since the last time it was read.
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If the value is
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2014-03-26 04:33:40 +00:00
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"\fByes\fR", the file is reread.
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2013-03-10 12:04:00 +00:00
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This might cause problems in multithreaded
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2013-02-09 22:03:46 +00:00
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applications and is generally a bad idea.
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The default is "\fBno\fR".
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2013-02-09 21:54:23 +00:00
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.TP
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\fBscopev4\fR \fImask\fR \fIvalue\fR
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2013-02-09 22:03:46 +00:00
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Add another rule to the RFC\ 3484 scope table for IPv4 address.
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By default, the scope IDs described in section 3.2 in RFC\ 3438 are used.
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2013-02-09 21:54:23 +00:00
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Changing these defaults should hardly ever be necessary.
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2013-02-09 22:03:46 +00:00
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.SH FILES
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\fI/etc/gai.conf\fR
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2016-02-26 16:26:23 +00:00
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.SH VERSIONS
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The
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.I gai.conf
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.\" Added in 2006
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file is supported by glibc since version 2.5.
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2020-05-21 08:00:37 +00:00
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.SH EXAMPLES
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2013-02-09 22:03:46 +00:00
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The default table according to RFC\ 3484 would be specified with the
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2013-02-09 21:54:23 +00:00
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following configuration file:
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cpuid.4, fd.4, full.4, initrd.4, lirc.4, msr.4, null.4, vcs.4, charmap.5, core.5, dir_colors.5, filesystems.5, gai.conf.5, hosts.equiv.5, locale.5, motd.5, networks.5, nscd.conf.5, nss.5, proc.5, protocols.5, repertoiremap.5, services.5, tmpfs.5, ttytype.5, intro.8, nscd.8: ffix
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2017-08-17 22:59:55 +00:00
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.PP
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2017-08-19 08:56:06 +00:00
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.in +4n
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.EX
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2013-02-09 21:54:23 +00:00
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label ::1/128 0
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label ::/0 1
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label 2002::/16 2
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label ::/96 3
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label ::ffff:0:0/96 4
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precedence ::1/128 50
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precedence ::/0 40
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precedence 2002::/16 30
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precedence ::/96 20
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precedence ::ffff:0:0/96 10
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2017-08-19 08:56:06 +00:00
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.EE
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.in
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2013-02-09 22:03:46 +00:00
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.\" .SH AUTHOR
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.\" Ulrich Drepper <drepper@redhat.com>
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2013-03-05 17:22:04 +00:00
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.\"
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2013-02-09 21:54:23 +00:00
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.SH SEE ALSO
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2014-02-10 07:08:16 +00:00
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.BR getaddrinfo (3),
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2013-02-09 22:03:46 +00:00
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RFC\ 3484
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