Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add some missing consts.

Add support for *at syscalls:
- openat(2)
- unlinkat(2)
- mkdirat(2)
- linkat(2)
- symlinkat(2)
- renameat(2)
- mkfifoat(2)
- mknodat(2)
- fchmodat(2)
- fchownat(2)
- fstatat(2)

Pass descriptor number to write(2), now that it is possible.

Add support for the following syscalls:
- fchmod(2),
- fchown(2),
- fchflags(2),
- fstat(2),
- ftruncate(2),
- fpathconf(2),
- lpathconf(2).
Make write(2) syscall to take descriptor instead of file name.

We implement descriptors by keeping track of open files and allowing to
reference them by the following syscalls. Because pjdfstest already supports
executing multiple syscalls from one command it works pretty well.

For example, the following command:

pjdfstest open foo "O_CREAT,O_RDWR" 0 : open bar "O_CREAT,O_RDONLY" 640 : fchmod 0 0666 : fchown 0 -1 20 : fchmod 1 0444

is equivalent of (error checking omitted):

int fd[2];

fd[0] = open("foo", O_CREAT | O_RDWR, 0);
fd[1] = open("bar", O_CREAT | O_RDONLY, 0640);
fchmod(fd[0], 0666);
fchown(fd[0], -1, 20);
fchmod(fd[1], 0444);

Finish renaming fstest to pjdfstest.

Give fstest a more unique name: pjdfstest.
It is released from time to time and used outside FreeBSD, so it is good to
have a name one can google.

Update copyright years.

Linux has no strlcpy().

Fix bind(2) and connect(2) support on Solaris.

Add mknod(2) support.

Submitted by: Jan Senolt <senoltj@centrum.cz>
Submitted by: Milan Cermak <Milan.Cermak@Sun.COM>

Sort includes.

Add missing -U argument to usage.

Implement two new syscalls: bind(2) and connect(2) for operating on UNIX
domain sockets.

Add regression tests for NFSv4 ACL granular permission enforcement.

lchflags(2) takes int, not u_long like chflags(2) and fchflags(2).
Strange, isn't it?

Pointed out by: bde

Add explicit casting in few places.

It is only really necessary for open(2)'s third argument, which is optional and
obtained through stdarg(3). open(2)'s third argument is 32bit and we pass 64
bits. On little endian it works, because we take lower 32 bits, but on big
endian platforms we take upper 32 bits, so we end up with 0.

Reported by: Milan Čermák <Milan.Cermak@Sun.COM>

Add support for pathconf(2).

Make fstest work out-of-the-box on Solaris:
- Solaris' setgroups(2) doesn't change process' effective gid, so set it
explicitly.
- POSIX doesn't define O_NOFOLLOW. FreeBSD returns EMLINK when target is
a symbolic link, but Solaris returns ELOOP then.
- Solaris doesn't define O_SHLOCK and O_EXLOCK flags.

Approved by: re (rwatson)

Add 3436 file system regression tests in 184 files.
Almost all regression tests are based on very flexible fstest tool.
They verify correctness (POSIX conformance) of almost all file
system-related system calls.

The motivation behind this work is my ZFS port and POSIX, who doesn't
provide free test suites.

Runs on: FreeBSD/UFS, FreeBSD/ZFS, Solaris/UFS, Solaris/ZFS

To try it out:

# cd fstest
# make
# find tests/* -type d | xargs prove