Fix "missing entries" bug when reading large directories: When reading a
directory and running out of space in the dest buffer, off should point to the
current entry (which was not saved) and not to

Fix "missing entries" bug when reading large directories: When reading a
directory and running out of space in the dest buffer, off should point to the
current entry (which was not saved) and not to the next.
I discovered this bug using linux and SunOS emulation over NFS, but seems to
affect other emulations as well.

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Changes to the sudio system:
- It is now possible to handle devices that want "looping" DMA,
e.g. the SoundBlaster correctly. The WSS and SB drivers use this.
To do this several new method

Changes to the sudio system:
- It is now possible to handle devices that want "looping" DMA,
e.g. the SoundBlaster correctly. The WSS and SB drivers use this.
To do this several new methods were introduced in audio_hw_if.
- Different silence handling (forced by previous change).
- The audio driver can now be mmap()-ed, but due to problems in
the VM system only for writing for now.
- The OSS (Linux) audio emulation takes advantage of some of the
new features.

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Add Linux nice() syscall.

sys/dir.h -> sys/dirent.h

Catch up with setre[ug]id() changes.

Update list of Linux syscalls and implement the ones that are likely to be
used and doable.

- Prototyping changes
- Fix bug that gcc -Wall found in linux_sys_getpgid()

Add explicit return types.

msync, readv and writev were recently added to the Linux kernel; add them
to the emulation as well.

We don't need a private version of fork() here any more.

Use cookies for directory offset, mostly from Greg Hudson.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Update offset elsewhere in linux_getdents(); still emulate a bug in
Linux, but avoid endless loops.

Fix some bugs & typing problems.

Emulate some syscalls that appear in Linux 1.3: a select() with normal args,
getdents() and flock().

Check for status NULL argument in wait4 and waitpid. From PR #1392
by Thomas EberHardt.

Implement the old and older uname(2) calls.

If updating the timeval would make it negative, zero it instead.

Allow bogus timevals, per Linux.

Export bsd_to_linux_sig[], and use it.

Rearrange #includes.

Linux doesn't allow select(2) to be restarted.

Use compat_util.[ch].

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)