MFC r320472,r320508,r320509:
Make stdio deferred cancel-safe.

Requested by: eugen

MFC: r289863,r289931,r290110,r290230,r290231,r290232

r290232:

Microoptimize.

r290231:

Addition to prev. commit.
In some edge cases fp->_p can be changed in _sseek(), recalculate.

r290230:

Don't seek to the end if write buffer is empty (in append modes).
PR: 204156

r290110:

Add _flags2 per jhb@ suggestion since no room left in _flags.
Rewrite O_APPEND flag checking using new __S2OAP flag.

r289931:

According to POSIX, a write operation shall start at the current size of
the stream (if mode had 'a' as the first character).

r289863:

Since no room left in the _flags, reuse __SALC for O_APPEND.
It helps to remove _fcntl() call from _ftello() and optimize seek position
calculation in _swrite().

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Convert libc/stdio from K&R to ANSI C

And add '__restrict' where it appeared in the header prototypes

Renumber clauses to reduce diffs to other versions

NetBSD, OpenBSD, and Android's Bionic all number the clauses 1 through 3,
so follow suit to make comparison easier.

Acked-by: imp@

Retire the __fgetcookie(), __fgetpendout(), and __fsetfileno() accessors
as we aren't hiding FILE's internals anymore.

Unbreak build: gnu sort has been configured to grope inside struct
__sFILE. It's opaque now, so add a function that returns the pending
output bytes.

Pointy hat: jhb

Unbreak build: libftpio gropes inside struct __sFILE. Implement
accessor functions for its benefit now thaat FILE is opaque.
I'm sure there's a better way. I leave that for people to work
on in a src tree that isn't broken.

Pointy hat: jhb

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

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

#include <stdlib.h> for free()'s prototype.

Fix the style of the SCM ID's.
I believe have made all of libc .c's as consistent as possible.

Remove 'register' keyword.

Help to recover from bad seek (i.e. negative or too big) happens beyond
our pre-check control. Do the same way as refill.c does when it set __SERR,
i.e. clear read and ungetc buffers. Clear EOF flag too.

Back out read buffer invalidating via __SMOD.

It was correct, but not needed because internal buffer cleared on each seek
outside of it.

Disallow fseek() optimization in internal read buffer, if pointer is moved by
seek. It means that beginning of read buffer becomes not the same as current
file position.

1) If __SAPP stream is not seekable, remove __SAPP flag on first call instead
of repeating unsuccessful lseek call on each write (original stdio bug).

2) Save errno accross _sseek call in _swrite to not touch it in case write
success (original stdio bug).

3) Add _sseek error checking back, but only for __SOPT mode now.

For now just back out seek error checking in __SAPP case, it cause problems
with non-seekable streams. Now here is what here was originally, but it is
ugly, producing unneded seek syscall on each non-seekable stream write. I'll
think about proper solution later.

Re-arrange my funopen(3) fix to minimize differences with original stdio code,
no functional changes.

Add fp->_offset optimization in _SAPP+_SOPT case

Move all stdio internal flags processing and setting out of __sread(),
__swrite() and __sseek() to higher level. According to funopen(3) they all
are just wrappers to something like standard read(2), write(2) and
lseek(2), i.e. must not touch stdio internals because they are replaceable
with any other functions knows nothing about stdio internals. See example
of funopen(3) usage in sendmail sources f.e.

NOTE: this is original stdio bug, not result of my range checkin added.

If lseek to wrong value sucessfully happens despite all pre-checks, set __SERR
to indicate that stream becomes inconsistent.

Detect fp->_offset overflow on read
Use errno to catch negative seek with -1 offset

Remove extra check, already done in upper level caller, i.e. in
_fseeko()

1) Disallow negative seek as POSIX require for fseek{o} (but not for lseek):

"[EINVAL] ... The resulting file-position indicator would be set to a
negative value."

Moreover, in real life negative seek in stdio cause EOF indicator cleared
and not set again forever even if EOF returned.

2) Catch few possible off_t overflows.

Reviewed by: arch discussion

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

Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(),
just use _foo() <-- foo(). In the case of a libpthread that doesn't do
call conversion (such as linuxthreads and our upcoming libpthread), this
is adequate. In the case of libc_r, we still need three names, which are
now _thread_sys_foo() <-- _foo() <-- foo().

Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(),
nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo().

Remove all internal libc usage of: creat(), pause(), sleep(), system(),
tcdrain(), wait(), and waitpid().

Make thread cancellation fully POSIX-compliant.

Suggested by: deischen

Add three-tier symbol naming in support of POSIX thread cancellation
points. For library functions, the pattern is __sleep() <--
_libc_sleep() <-- sleep(). The arrows represent weak aliases. For
system calls, the pattern is _read() <-- _libc_read() <-- read().

$Id$ -> $FreeBSD$

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Suggested by: Bruce Evans, Jeffrey Hsu, Gary Palmer

Added $Id$'s to files that were lacking them (gpalmer), made some
cosmetic changes to conform to style guidelines (bde) and checked
against NetBSD and Lite2 to remove unnecessary divergences (hsu, bde)

One last code cleanup:-

Removed spurious casts in fseek.c and stdio.c.
Added missing function argument in fwalk.c.
Added missing header include in flags.c and rget.c.
Put in casts where int's were being passed as size_t's.
Put in missing prototypes for static functions.
Changed second args of __sflags() inflags.c and writehook() in vasprintf.c
from char * to const char * to conform to prototypes.

This directory now compiles with no warnings with -Wall under
gcc-2.6.3 and with considerably less warnings than before with the
ultra-pedantic script I used for testing. (Most of the remaining ones
are due to const poisoning).

Code cleanup:-

The usual stuff, adding missing function prototypes, argument types,
return values, etc.

This directory now compiles with no warnings with -Wall on gcc2.6.3!

Remove trailing whitespace.

This commit was generated by cvs2svn to compensate for changes in r1573,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Lib Sources