MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge from head

Merge r278538 through r279514.

Merge ^/head r279163 through r279308.

setmode(3): Make sure that setmode sets errno on failure.

Our man page already documented this partially but now
we have some consistent behavior.

PR: 136669
Obtained from: NetBSD (CVS rev. 1.31,

setmode(3): Make sure that setmode sets errno on failure.

Our man page already documented this partially but now
we have some consistent behavior.

PR: 136669
Obtained from: NetBSD (CVS rev. 1.31, 1.33)
Relnotes: yes
MFC after: 3 weeks

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Merge ^/head r279023 through r279162.

tab vs spaces.

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

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

Use prototypes in the function definitions.

More changes from NetBSD:

* use correct error detection of realloc failure
* strtol negative return check
* use strtol to validate string instead of rolling our own
validation

More changes from NetBSD:

* use correct error detection of realloc failure
* strtol negative return check
* use strtol to validate string instead of rolling our own
validation code
* terminate the command sequence correctly

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Grab some changes from NetBSD:

fix const poisoning
add cast to silence warning
pull in unistd.h

* Remove __P and convert to ANSI prototypes.
* Remove 'register'. (some functions had 7+ register functions...)
* Fix SCM ID's.

Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions. If the threads library is linked in, the real
pthread functions will

Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions. If the threads library is linked in, the real
pthread functions will pulled in.

Use the following convention for system calls wrapped by the
threads library:
__sys_foo - actual system call
_foo - weak definition to __sys_foo
foo - weak definition to __sys_foo

Change all libc uses of system calls wrapped by the threads
library from foo to _foo. In order to define the prototypes
for _foo(), we introduce namespace.h and un-namespace.h
(suggested by bde). All files that need to reference these
system calls, should include namespace.h before any standard
includes, then include un-namespace.h after the standard
includes and before any local includes. <db.h> is an exception
and shouldn't be included in between namespace.h and
un-namespace.h namespace.h will define foo to _foo, and
un-namespace.h will undefine foo.

Try to eliminate some of the recursive calls to MT-safe
functions in libc/stdio in preparation for adding a mutex
to FILE. We have recursive mutexes, but would like to avoid
using them if possible.

Remove uneeded includes of <errno.h> from a few files.

Add $FreeBSD$ to a few files in order to pass commitprep.

Approved by: -arch

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Add unsigned char cast to isdigit

If `who' was not specified, set the appropriate bits as the chmod(1)
manual page states. `chmod +s foo' and `chmod +t foodir' now work.

PR: 13889

Minor cleanup, mostly unused vars and missing #includes.

Remove trailing whitespace.

BSD 4.4 Lite Lib Sources