o Source ID's in wrong location.
o Space used, instead of tab, after typedef.
o Unaligned function prototype for twalk().
Other changes:
o Add missing const qualifier in tfind().
o Add comment about missing functions.
`sigprocmask', `sigaltstack', and `sigwait' as well as to the
prototypes of the apparantly unimplemented functions `sigtimedwait'
and `sigwaitinfo'. This complies with IEEE Std 1003.1-2001.
o Fix regoff_t typedef to not require <sys/types.h> as a prerequisite
(specifically use `__off_t' instead of `off_t').
o Add restrict type-qualifier to function prototypes.
one into the latter and removed the former.
This works around the bug that some broken Makefiles add -I.../src/include
to CFLAGS, resulting in the old math.h being preferred and differences
between the headers possibly being fatal.
The merge mainly involves declaring some functions as __pure2 although
they are not yet all strictly free of side effects.
PR: 43544
Although there was nothing wrong with getwc() and putwc(), getwchar()
and putwchar() assumed that <stdio.h> had been included before <wchar.h>,
which is not allowed by the standard.
o Include <sys/select.h> from <sys/types.h> in the __BSD_VISIBLE case,
so applications and base software can be slowly updated.
o Prototype select() in <sys/select.h>. It was previously only
prototyped in <unistd.h>.
o Add some XXX's to <sys/types.h>.
Reviewed by: -standards
(or would be) implemented (or not) exclusively in user-land. A threads
expert should check over the values I have set to make sure that they
correctly reflect reality.
Move all sysconf() keys here from <sys/unistd.h> as they are not implemented
in the kernel. Add new keys from 1003.1-2001 final text. (Some additional
keys are expected in TC1.)
Add some protection against redundant declarations between <stdlib.h>
and <unistd.h> for some functions which XSI requires in the former and
BSD traditionally declares in the latter. Restrict qualifiers and other
changes from 1003.1-2001 have not been made to the functions prototyped here.
(3 of 5)
new 1003.1-2001 declarations, commented out in cases where we do not
implement the function. Note that strtoq() and strtouq() are slated
for deletion in 6.0. (2 of 5)
hack, thereby allowing future extensions to the structure (e.g., for extended
attributes) without rebreaking the ABI. FTSENT now contains a pointer to the
parent stream, which fts_compar() can then take advantage of, avoiding the
undefined behavior previously warned about. As a consequence of this change,
the prototype of the comparison function passed to fts_open() has changed
to reflect the required amount of constness for its use. All callers in the
tree are updated to use the correct prototype.
Comparison functions can now make use of the new parent pointer to access
the new stream-specific private data pointer, which is intended to assist
creation of reentrant library routines which use fts(3) internally.
Not objected to in spirit by: -arch
under way to move the remnants of the a.out toolchain to ports. As the
comment in src/Makefile said, this stuff is deprecated and one should not
expect this to remain beyond 4.0-REL. It has already lasted WAY beyond
that.
Notable exceptions:
gcc - I have not touched the a.out generation stuff there.
ldd/ldconfig - still have some code to interface with a.out rtld.
old as/ld/etc - I have not removed these yet, pending their move to ports.
some includes - necessary for ldd/ldconfig for now.
Tested on: i386 (extensively), alpha
visibility primitives.
o Implement _tolower() and _toupper() POSIX.1-2001 (XSI) macros in
<ctype.h>.
o Reduce pollution in <runetype.h> by removing typedefs and using
implementation namespaced types.
o Add a typedef in <rune.h> to compensate for <runetype.h> losing its
typedefs.
Reviewed by: bde
called <machine/_types.h>.
o <machine/ansi.h> will continue to live so it can define MD clock
macros, which are only MD because of gratuitous differences between
architectures.
o Change all headers to make use of this. This mainly involves
changing:
#ifdef _BSD_FOO_T_
typedef _BSD_FOO_T_ foo_t;
#undef _BSD_FOO_T_
#endif
to:
#ifndef _FOO_T_DECLARED
typedef __foo_t foo_t;
#define _FOO_T_DECLARED
#endif
Concept by: bde
Reviewed by: jake, obrien
Fix the following style bugs:
o #ifdef, #ifndef, and #undef should be followed by a space, not a
tab.
o The second level of indentation in prototypes is 4 characters even
when the function names are indented 1 extra character.
o Type qualifiers that appear next to a * need a seperating space so
that the qualifier isn't easily confused with parameter names.
(eg. `char * __restrict' instead of `char *__restrict')
Submitted by: bde (mostly)
definitions of the functions that convert strings to numbers
and are defined by IEEE Std 1003-1.2001.
- Use ANSI-C function definitions for all of the functions
mentioned above plus strtouq and strtoq.
- Update the prototypes in the manual pages.
public prototypes of setbuf(3) and setvbuf(3) using the
'__restrict' macro from <sys/cdefs.h> to be compliant with
IEEE Std 1003.1-2001.
- Replace the K&R with ANSI-C function definitions.
- Bring the manual page up-to-date.
strftime(3) for IEEE Std 1003.1-2001 compliance and remove
excessive usage of the 'const' qualifier that was neither
present in the prototype in the publice header, nor in the
local prototype just above the function definition.
- Replace the K&R function definition with a ANSI-C one.
- Update the prototype of strftime(3) in its manual page.
of our __restrict macro to the prototypes and function
definitions of inet_pton and inet_ntop.
- Use ANSI-C function argument lists.
- Adjust the prototypes in the manual page.
towlower() and towupper() required by ISO C90 Amd. 1.
iswascii(), iswhexnumber(), iswideogram(), iswnumber(), iswphonogram(),
iswrune() and iswspecial() have also been implemented for consistency
with the BSD extensions in <ctype.h>.
- add GLOB_NOMATCH return value and use it when we don't get a match
- rename GLOB_ABEND to GLOB_ABORTED and use it instead of returning 1
in some places
- add GLOB_NOESCAPE flag and retire GLOB_QUOTE to compatibility
section
Suggestions/advice on correct usage of POSIX defines: wollman
support creation times such as UFS2) to the value of the
modification time if the value of the modification time is older
than the current creation time. See utimes(2) for further details.
Sponsored by: DARPA & NAI Labs.
file. Correct visibility conditions and order blocks of declarations
in order of increasing inclusiveness. Note that [v]snprintf() is now
in ISO C and f{seek,tell}o() are now in POSIX. Deprecated getw() and
putw() are no longer visible in XSH6 namespace (and should probably
be removed from BSD namespace as well).
hardly MD, since all our platforms share the same macro. It's not
really compiler dependent either, but this helps in reducing
<machine/ansi.h> to only type definitions.
filesystem expands the inode to 256 bytes to make space for 64-bit
block pointers. It also adds a file-creation time field, an ability
to use jumbo blocks per inode to allow extent like pointer density,
and space for extended attributes (up to twice the filesystem block
size worth of attributes, e.g., on a 16K filesystem, there is space
for 32K of attributes). UFS2 fully supports and runs existing UFS1
filesystems. New filesystems built using newfs can be built in either
UFS1 or UFS2 format using the -O option. In this commit UFS1 is
the default format, so if you want to build UFS2 format filesystems,
you must specify -O 2. This default will be changed to UFS2 when
UFS2 proves itself to be stable. In this commit the boot code for
reading UFS2 filesystems is not compiled (see /sys/boot/common/ufsread.c)
as there is insufficient space in the boot block. Once the size of the
boot block is increased, this code can be defined.
Things to note: the definition of SBSIZE has changed to SBLOCKSIZE.
The header file <ufs/ufs/dinode.h> must be included before
<ufs/ffs/fs.h> so as to get the definitions of ufs2_daddr_t and
ufs_lbn_t.
Still TODO:
Verify that the first level bootstraps work for all the architectures.
Convert the utility ffsinfo to understand UFS2 and test growfs.
Add support for the extended attribute storage. Update soft updates
to ensure integrity of extended attribute storage. Switch the
current extended attribute interfaces to use the extended attribute
storage. Add the extent like functionality (framework is there,
but is currently never used).
Sponsored by: DARPA & NAI Labs.
Reviewed by: Poul-Henning Kamp <phk@freebsd.org>
Since they were never documented and have never appeared in a FreeBSD
release, no repo-copy of the header is done. This removes namespace
pollution from <time.h>.
instead, add typedefs of only gid_t, time_t, and uid_t.
o Remove an unneeded conditional that hid macros that are in the
implementation namespace and therefore don't need to be hidden when
_POSIX_SOURCE is defined.
o Adjust some conditionals for compatibility with X/Open and POSIX.
o Note missing functions getpwnam_r() and getpwuid_r().
__dlfunc_t to dlfunc_t to match what I have proposed to the Austin
Group. (This also makes it easier for applications to store these
values before they decide what to do with them, e.g., in a wrapper
function.)
Add new dlfunc() interface, which is a version of dlsym() with a
return type that can be cast to a function pointer without turning
your computer into a frog.
Reviewed by: freebsd-standards
Rename `incsinstall' to `installincludes'.
Make `includes' a -j safe shortcut for `buildincludes' + `installincludes'.
`buildincludes' and `installincludes' are SUBDIR friendly, if run directly.
via INCS. Implemented INCSLINKS (equivalent to SYMLINKS) to
handle symlinking include files. Allow for multiple groups of
include files to be installed, with the powerful INCSGROUPS knob.
Documentation to follow.
Added standard `includes' and `incsinstall' targets, use them
in Makefile.inc1. Headers from the following makefiles were
not installed before (during `includes' in Makefile.inc1):
kerberos5/lib/libtelnet/Makefile
lib/libbz2/Makefile
lib/libdevinfo/Makefile
lib/libform/Makefile
lib/libisc/Makefile
lib/libmenu/Makefile
lib/libmilter/Makefile
lib/libpanel/Makefile
Replaced all `beforeinstall' targets for installing includes
with the INCS stuff.
Renamed INCDIR to INCSDIR, for consistency with FILES and SCRIPTS,
and for compatibility with NetBSD. Similarly for INCOWN, INCGRP,
and INCMODE.
Consistently use INCLUDEDIR instead of /usr/include.
gnu/lib/libstdc++/Makefile and gnu/lib/libsupc++/Makefile changes
were only lightly tested due to the missing contrib/libstdc++-v3.
I fully tested the pre-WIP_GCC31 version of this patch with the
contrib/libstdc++.295 stuff.
These changes have been tested on i386 with the -DNO_WERROR "make
world" and "make release".
environment needed at boot time to a dynamic subsystem when VM is
up. The dynamic kernel environment is protected by an sx lock.
This adds some new functions to manipulate the kernel environment :
freeenv(), setenv(), unsetenv() and testenv(). freeenv() has to be
called after every getenv() when you have finished using the string.
testenv() only tests if an environment variable is present, and
doesn't require a freeenv() call. setenv() and unsetenv() are self
explanatory.
The kenv(2) syscall exports these new functionalities to userland,
mainly for kenv(1).
Reviewed by: peter
has been requested.
Unconditionalize the definition of INET_ADDRSTRLEN and
INET6_ADDRSTRLEN. Doing this helps expose bogus redefinitions in 3rd
party software.
<strings.h>, based on POSIX.1-2001's requirements.
o Add 'restrict' qualifier (spelled '__restrict') to functions in
<string.h>, as per C99 and POSIX.1-2001.
o Properly expose new POSIX.1-2001 functions in <string.h>.
MI, not required to be a fixed size, and used in multiple headers.
This will grow in time, as more things move here from <sys/types.h>
and <machine/ansi.h>.
o Add missing type definitions (uint16_t and uint32_t) to
<arpa/inet.h> and <netinet/in.h>.
o Reduce pollution in <sys/types.h> by using `#if _FOO_T_DECLARED'
widgets to avoid including <sys/stdint.h>.
o Add some missing type definitions to <unistd.h> and note the ones
that still need to be added.
o Make use of <sys/_types.h> primitives in <grp.h> and <sys/types.h>.
Reviewed by: bde
Install sys/<arch>/include/pc/*.h to /usr/include/machine/pc/.
PR: docs/29534
Install sys/netatm/*/*.h to /usr/include/netatm/*/.
Don't install compatibility symlinks for <machine/soundcard.h>
and <machine/joystick.h>. Three years is enough to be aware of
the change, and these weren't visible in the SHARED=symlinks
case.
Back out include/Makefile,v 1.160 that was a null change anyway
due to the bug in the path, and we now don't want to install
these headers because they would otherwise be invisible in the
SHARED=symlinks case.
Don't install IPFILTER headers. Userland utilities fetch them
directly, and they were not visible in the SHARED=symlinks case.
Resurrect SHARED=symlinks in Makefile.inc1.
PR: bin/28002
Prodded by: bde
MFC after: 2 weeks
# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.
for POSIX.1-2001 conformance.
o Add magic to <netinet/in.h> and <netinet6/in6.h> to prevent
redefining INET_ADDRSTRLEN and INET6_ADDRSTRLEN.
o Add a note about missing typedefs in <arpa/inet.h>.
o In i386's <machine/endian.h>, macros have some advantages over
inlines, so change some inlines to macros.
o In i386's <machine/endian.h>, ungarbage collect word_swap_int()
(previously __uint16_swap_uint32), it has some uses on i386's with
PDP endianness.
Submitted by: bde
o Move a comment up in <machine/endian.h> that was accidentially moved
down a few revisions ago.
o Reenable userland's use of optimized inline-asm versions of
byteorder(3) functions.
o Fix ordering of prototypes vs. redefinition of byteorder(3)
functions, so that the non-GCC (libc asm) case has proper
prototypes.
o Add proper prototypes for byteorder(3) functions in <sys/param.h>.
o Prevent redundant duplicate prototypes by making use of the
_BYTEORDER_PROTOTYPED define.
o Move the bswap16(), bswap32(), bswap64() C functions into MD space
for platforms in which asm versions don't exist. This significantly
reduces the complexity of some things at the cost of duplicate code.
Reviewed by: bde
deprecated in favor of the POSIX-defined lowercase variants.
o Change all occurrences of NTOHL() and associated marcros in the
source tree to use the lowercase function variants.
o Add missing license bits to sparc64's <machine/endian.h>.
Approved by: jake
o Clean up <machine/endian.h> files.
o Remove unused __uint16_swap_uint32() from i386's <machine/endian.h>.
o Remove prototypes for non-existent bswapXX() functions.
o Include <machine/endian.h> in <arpa/inet.h> to define the
POSIX-required ntohl() family of functions.
o Do similar things to expose the ntohl() family in libstand, <netinet/in.h>,
and <sys/param.h>.
o Prepend underscores to the ntohl() family to help deal with
complexities associated with having MD (asm and inline) versions, and
having to prevent exposure of these functions in other headers that
happen to make use of endian-specific defines.
o Create weak aliases to the canonical function name to help deal with
third-party software forgetting to include an appropriate header.
o Remove some now unneeded pollution from <sys/types.h>.
o Add missing <arpa/inet.h> includes in userland.
Tested on: alpha, i386
Reviewed by: bde, jake, tmm
Move group_from_gid to grp.h
Remove from stdlib.h
Make the prototypes match the code
Fix rm and mv to include new files.
NetBSD has these defined in those files, and others too that I've not
done.
Approved by: terminal room kabal
Reviewed by: jhb, phk
change prototypes to be the same as in the original sun tirpc code.
Remove ()P macro in a file where the mayority had ()P already removed.
Add them if the mayority use ()P macros.
Submitted by: mbr
Requested by: bde
compile issues. std::isspace(' ') was expanding to std::(!!_maskrune...)
which would cause a C++ compile error. Making __istype() an inline
causes the expansion to be std::__istype() instead, which is valid.
Reviewed by: jkh
and sbrk's prototype from char *sbrk(int) to void *sbrk(intptr_t).
This makes us more consistant with NetBSD and standards which include
these functions. Bruce pointed out that ptrdiff_t would probably
have been better than intptr_t, but this doesn't match other
implimentations.
Also remove local declarations of sbrk and unnecessary casting.
PR: 32296
Tested by: Harti Brandt <brandt@fokus.gmd.de>
MFC after: 1 month
time_to_xxx() and xxx_to_time() functions. e.g. _time_to_xxx()
instead of time_to_xxx(), to make it more obvious that these are
stopgap functions & placemarkers and not meant to create a defacto
standard. They will eventually be replaced when a real standard
comes out of committee.
a packed array so sizeof work. This broke RFMON mode and passing
up 802.11 packets.
The Linux emulation code was derived from the open source Linux driver to
maintain compatibility.
LEAP support is added, hints from Richard Johnson. I've verified this
locally with PC350v42510.img firmware. More bug fixing from Marco to
fix long passwords.
Change DELAYs in flash part of driver to FLASH_DELAY which uses tsleep
so it doesn't look like your system died during a flash update.
Install header files in /usr/include/dev/an
Cleanup some ifmedia bugs add "Home" key mode to ifmedia and ancontrol.
This way you can manage 2 keys a little easier. Map the home mode into
key 5. Enhance ifconfig to dump the various configured SSIDs. I use
a bunch of different ones and roam between them. Use the syntax similar
to the WEP keys to deal with setting difference SSIDs.
Bump up up the Card capabilities RID since they added 2 bytes to it
in the latest firmware. Thankfully we changed it from a terminal
failure so the card still worked but the driver whined.
Some cleanup patches from Marco Molteni.
Submitted by: Richard Johnson <raj@cisco.com>
Marco Molteni <molter@tin.it>
and myself
Various checks: David Wolfskill <david@catwhisker.org>
Reviewed by: Brooks Davis <brooks@freebsd.org>
Warner Losh <imp@freebsd.org>
Approved by: Brooks Davis <brooks@freebsd.org>
Warner Losh <imp@freebsd.org>
Obtained from: Linux emulation API's from Aironet driver.
We'll never install math.h wrapped by this define since msun's math.h
is using, so it should be removed from the source tree at some point
(after merge of useful stuff to msun's math.h which is installing now
to /usr/include)
Reviewed by: bde
o Hide nonstandard functions and types in <netinet/in.h> when
_POSIX_SOURCE is defined.
o Add some missing types (required by POSIX.1-200x) to <netinet/in.h>.
o Restore vendor ID from Rev 1.1 in <netinet/in.h> and make use of new
__FBSDID() macro.
o Fix some miscellaneous issues in <arpa/inet.h>.
o Correct final argument for the inet_ntop() function (POSIX.1-200x).
o Get rid of the namespace pollution from <sys/types.h> in
<arpa/inet.h>.
Reviewed by: fenner
Partially submitted by: bde
the following functions in the following commits:
- atoll() in revs 1.23-1.25
- llabs() and lldiv() in revs 1.22
- strtoq() and strtouq() in revs 1.18
C99 functions must not be declared in C90/POSIX.1-1990 sections, and
"long long" must not be exposed to compilers that don't support it.
Fixed style bugs (mainly misindentation and disorder) related the
following functions in the following commits:
- atoll() in revs 1.23-1.25
- getprogname() in rev.1.21
- sranddev() in revs 1.19-1.20
- strtoq() and strtouq() in rev.1.13
- user_from_uid() in rev.1.1
Breakage of K&R and C90 support used to be avoided by conditializing the
"long long"s for strtoq() and strtouq() on __STRICT_ANSI__, but the
conditionals should have gone away in rev.1.13 when the "long long"s went
away (the problem was moved to the places that declare quad_t and u_quad_t).
includes changing a struct timeval to an explicit structure of two
int32_t's. This requires using temporary timevals in several places
when calling gettimeofday(), settimeofday(), etc. With this timed now
works properly on 64-bit platforms such as Alpha.
Obtained from: NetBSD
o Make <stdint.h> a symbolic link to <sys/stdint.h>.
o Move most of <sys/inttypes.h> into <sys/stdint.h>, as per C99.
o Remove <sys/inttypes.h>.
o Adjust includes in sys/types.h and boot/efi/include/ia64/efibind.h
to reflect new location of integer types in <sys/stdint.h>.
o Remove previously symbolicly linked <inttypes.h>, instead create a
new file.
o Add MD headers <machine/_inttypes.h> from NetBSD.
o Include <sys/stdint.h> in <inttypes.h>, as required by C99; and
include <machine/_inttypes.h> in <inttypes.h>, to fill in the
remaining requirements for <inttypes.h>.
o Add additional integer types in <machine/ansi.h> and
<machine/limits.h> which are included via <sys/stdint.h>.
Partially obtain from: NetBSD
Tested on: alpha, i386
Discussed on: freebsd-standards@bostonradio.org
Reviewed by: bde, fenner, obrien, wollman
header for the case where sizeof(time_t) != sizeof(int). dumprestore.h
was embedding time_t when it should have been embedding int32_t.
Use time_to_time32() and time32_to_time() to convert between the
protocoll/file-format time and time_t.
serve two purposes: (1) so we can maintain backwards compatibility with
protocols (rwhod, dump, etc...) that either assume time_t is 32 bits or
assume sizeof(time_t) == sizeof(int), or make other similar assumptions.
(2) To tag such routines (by the presence of these calls) for future
cleanup/extension work.
The 32->64 routine, time32_to_time() (when time_t is 64 bits, that is),
is defined specifically to implement temporal locality to properly set the
msb bits of a 64 bit time_t quantity, using the 50 year rule. The locality
code has not been implemented yet (and doesn't need to be for a while),
but that is the intent. This will allow us to maintain backwards protocol
compatibility past 2038.
These routines are intended to be platform and time_t agnostic.
MFC after: 1 week
number of characters that are searched. This is especially useful
with file operations and non-NUL terminated strings.
Silence from: -audit, -hackers
MFC after: 5 days
<machine/ansi.h> for the definition of __signed, unless the compiler
is gcc.
Moved the declaration of socklen_t up together with the declaration of
size_t, and removed low-quality comment about this declaration. Declaring
socklen_t in this file is normal in POSIX-1.200x, unlike declaring size_t.
- only declare the application symbols specified in Posix.1-200x drafts,
not everything in <sys/types.h> and <stddef.h>.
- don't use the application symbol 'm' for an arg name.
for negotiation of timeout and file size to the tftp protocol. This
is required by some firmware like EFI boot managers (at least on
HP i2000 Itanium servers) in order to boot an image using tftp. The
attached patch implements the RFC, and in doing so also implements
RFC2347; a generic tftp option extension.
PR: 30710
Submitted by: Espen Skoglund <esk@ira.uka.de>
switch over to using a future-proof stdin/out/err.
Note that if you run 4.x binaries on your system, you will certainly
want to update /usr/lib/compat/libc.so.4. The easiest way is to
add "COMPAT4X= yes" in your /etc/make.conf.
now prototyped indirectly in <arpa/inet.h>.
o Deprecate in_addr_t and in_port_t typedefs in <sys/types.h>, these
are now typedef'd in <arpa/inet.h>.
Discussed with: bde
PR: 29946
socket option for the Unix domain. It's weaker than the
socket option (this only returns the uid and gid, while the
socket opt. can return the entire group list), and is
implemented mostly for compatibility with OpenBSD.
It was foiled because of dynamic copy relocations that caused compile-time
space to be reserved in .bss and at run time a blob of data was copied to
that space and everything used the .bss version.. The problem is that
the space is reserved at compile time, not runtime... So we *still* could
not change the size of FILE. Sigh. :-(
Replace it with something that does actually work and really does let us
make 'FILE' extendable. It also happens to be the same as Linux does in
glibc, but has the slight cost of a pointer. Note that this is the
same cost that 'fp = fopen(), fprintf(fp, ...); fclose(fp);' has.
Fortunately, actual references to stdin/out/err are not all that common
since we have implicit stdin/out/err-using versions of functions
(printf() vs. fprintf()).
with NetBSD and OpenBSD. glob(3) will now return GLOB_NOSPACE with
errno set to 0 instead of GLOB_LIMIT when we match more than `gl_matchc'
patterns. GLOB_MAXPATH has been left as an alias of GLOB_LIMIT to
maintain backwards compatibility.
Reviewed by: sheldonh, assar
Obtained from: NetBSD/OpenBSD
be malloc()ed, but they are now allocated using mmap(), just as the
default-size stacks are. A separate cache of stacks is kept for
non-default-size stacks.
Collaboration with: deischen
whether or not connect(2) is used for UDP client sockets. The default
is not to connect(), so existing clients will see no change in
behaviour.
The use of connect(2) for UDP clients has a number of advantages:
only replies from the intended address are received, and ICMP errors
pertaining to the connection are reported back to the application.
and its associated constants. Implement _SC_IOV_MAX in the usual way.
Be a bit sloppy about the namespace question; this should get cleared up
in time for 5.0.
MFC after: 1 month
to fix the "-nostdinc WARNS=X" breakage caused by broken prototypes
for cabs() and cabsl() in <math.h>.
Reimplemented cabs() and cabsl() using new complex numbers types and
moved prototypes from <math.h> to <complex.h>.
IPv6 transport-ready resolvers/DNS servers. Need careful configuration
when enable it. (default config is not affected).
See manpage for details.
XXX visible symbol __res_opt() is added, however, it is not supposed to be
called from outside, libc minor is not bumped.
Obtained from: KAME/NetBSD
