Merge from head

IFC @ r255209

IFC

libc: Make various internal file descriptors from fopen() close-on-exec.

Update to current version of head.

MFC r206155, r206267: Add capability to use a db version of
services. It is enabled by specifying `db' as source of
services in /etc/nsswitch.conf.

MFC ir206152, r206153, r206154:
- Stop adding trailing '\n'. The servent_unpack() doesn't expect
lines terminated with '\n'.
- Treat '+' as special only when in compat mode, and simplify
the log

MFC ir206152, r206153, r206154:
- Stop adding trailing '\n'. The servent_unpack() doesn't expect
lines terminated with '\n'.
- Treat '+' as special only when in compat mode, and simplify
the logic bit.
- Reduce duplicate code.

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Use the stored length value instead of calculating it by strlen().

Add capability to use a db version of services. It is enabled by
specifying `db' as source of service in /etc/nsswitch.conf.

MFC after: 2 weeks

Reduce duplicate code.

MFC after: 2 weeks

Treat '+' as special only when in compat mode, and simplify
the logic bit.

MFC after: 2 weeks

Stop adding trailing '\n'. The servent_unpack() doesn't expect
lines terminated with '\n'.

MFC after: 2 weeks

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

- Extend the nsswitch to support Services, Protocols and Rpc
databases.
- Make nsswitch support caching.

Submitted by: Michael Bushkov <bushman__at__rsu.ru>
Sponsored by: Google Summer of Code 2005

- make reentrant version of netdb functions glibc style API, and
expose them to outside of libc.
- make netdb functions NSS friendly.

Reviewed by: arch@ and current@ (no objection)

Include <sys/types.h> and <limits.h> ourselves, don't assume they are included
through <pthread.h>.

gen/sem.c: Prerequisite for <_semaphore.h>
net/getprotoent.c: USHRT_MAX
net/getservent.c: USHRT_M

Include <sys/types.h> and <limits.h> ourselves, don't assume they are included
through <pthread.h>.

gen/sem.c: Prerequisite for <_semaphore.h>
net/getprotoent.c: USHRT_MAX
net/getservent.c: USHRT_MAX
stdio/ungetwc.c: MB_LEN_MAX
stdio/vfwscanf.c: MB_LEN_MAX

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make getnetby*() thread-safe.

rename the NIS related fields to have yp_ prefix.

Suggested by: delphij

Do not check whether a pointer is NULL, since free(3) already takes care of
this case.

Reviewed by: ume

Fix build for !YP case.

BTW. Shall we change these fields to have yp_ prefix? That will make the
code easier to read.

libc-internal interfaces should have two underscores in front
of their names.

Pointed out by: das

- add getserv{byname,byport,ent}_r for internal use within libc.
- make getserv{byname,byport,ent} thread-safe.

Reviewed by: gnn

Don't ignore the last line of config file (/etc/hosts, /etc/services, etc)
which doesn't end in \n, since it may be very confusing. Also this should
increase consistency, since most other config file

Don't ignore the last line of config file (/etc/hosts, /etc/services, etc)
which doesn't end in \n, since it may be very confusing. Also this should
increase consistency, since most other config files work just fine regardless
of the presence of traling \n in the last line.

MFC After: 2 weeks

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Eliminate 19 warnings in libc (at level WARNS=2) of the
`implicit declaration of function' variety.

Remove __P() usage.