386 system call fixes:

* use 64-bit file system calls (Linux, Darwin)
  * use 32-bit [sic] uid/gid calls (Linux)
  * fix sockets on Linux

Darwin/386 works again.

Linux/386 is better but must never have worked;
there are still bugs surrounding the creation of new
threads in the runtime package.

R=austin
DELTA=1332  (673 added, 614 deleted, 45 changed)
OCL=30327
CL=30380

src/pkg/syscall/syscall_linux.go

@@ -66,8 +66,6 @@ func Getwd() (wd string, errno int) {
 	return string(buf[0:n-1]), 0
 }
 
-//sys	getgroups(n int, list *_Gid_t) (nn int, errno int)
-//sys	setgroups(n int, list *_Gid_t) (errno int)
 func Getgroups() (gids []int, errno int) {
 	n, err := getgroups(0, nil);
 	if err != 0 {
@@ -380,7 +378,6 @@ func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
 //sys	Adjtimex(buf *Timex) (state int, errno int)
 //sys	Chdir(path string) (errno int)
 //sys	Chmod(path string, mode int) (errno int)
-//sys	Chown(path string, uid int, gid int) (errno int)
 //sys	Chroot(path string) (errno int)
 //sys	Close(fd int) (errno int)
 //sys	Creat(path string, mode int) (fd int, errno int)
@@ -395,18 +392,12 @@ func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
 //sys	Fchdir(fd int) (errno int)
 //sys	Fchmod(fd int, mode int) (errno int)
 //sys	Fchmodat(dirfd int, path string, mode int, flags int) (errno int)
-//sys	Fchown(fd int, uid int, gid int) (errno int)
 //sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (errno int)
 //sys	fcntl(fd int, cmd int, arg int) (val int, errno int)
 //sys	Fdatasync(fd int) (errno int)
-//sys	Fstat(fd int, stat *Stat_t) (errno int)
-//sys	Fstatfs(fd int, buf *Statfs_t) (errno int)
 //sys	Fsync(fd int) (errno int)
 //sys	Ftruncate(fd int, length int64) (errno int)
 //sys	Getdents(fd int, buf []byte) (n int, errno int) = SYS_GETDENTS64
-//sys	Getegid() (egid int)
-//sys	Geteuid() (euid int)
-//sys	Getgid() (gid int)
 //sys	Getpgid(pid int) (pgid int, errno int)
 //sys	Getpgrp() (pid int)
 //sys	Getpid() (pid int)
@@ -415,14 +406,11 @@ func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
 //sys	Getrusage(who int, rusage *Rusage) (errno int)
 //sys	Gettid() (tid int)
 //sys	Gettimeofday(tv *Timeval) (errno int)
-//sys	Getuid() (uid int)
 //sys	Ioperm(from int, num int, on int) (errno int)
 //sys	Iopl(level int) (errno int)
 //sys	Kill(pid int, sig int) (errno int)
 //sys	Klogctl(typ int, buf []byte) (n int, errno int) = SYS_SYSLOG
-//sys	Lchown(path string, uid int, gid int) (errno int)
 //sys	Link(oldpath string, newpath string) (errno int)
-//sys	Lstat(path string, stat *Stat_t) (errno int)
 //sys	Mkdir(path string, mode int) (errno int)
 //sys	Mkdirat(dirfd int, path string, mode int) (errno int)
 //sys	Mknod(path string, mode int, dev int) (errno int)
@@ -439,25 +427,15 @@ func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
 //sys	Rename(oldpath string, newpath string) (errno int)
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (errno int)
 //sys	Rmdir(path string) (errno int)
-//sys	Seek(fd int, offset int64, whence int) (off int64, errno int) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, errno int)
 //sys	Setdomainname(p []byte) (errno int)
-//sys	Setfsgid(gid int) (errno int)
-//sys	Setfsuid(uid int) (errno int)
-//sys	Setgid(gid int) (errno int)
 //sys	Sethostname(p []byte) (errno int)
 //sys	Setpgid(pid int, pgid int) (errno int)
-//sys	Setregid(rgid int, egid int) (errno int)
-//sys	Setresgid(rgid int, egid int, sgid int) (errno int)
-//sys	Setresuid(ruid int, euid int, suid int) (errno int)
-//sys	Setreuid(ruid int, euid int) (errno int)
 //sys	Setrlimit(resource int, rlim *Rlimit) (errno int)
 //sys	Setsid() (pid int)
 //sys	Settimeofday(tv *Timeval) (errno int)
 //sys	Setuid(uid int) (errno int)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, errno int)
-//sys	Stat(path string, stat *Stat_t) (errno int)
-//sys	Statfs(path string, buf *Statfs_t) (errno int)
 //sys	Symlink(oldpath string, newpath string) (errno int)
 //sys	Sync()
 //sys	SyncFileRange(fd int, off int64, n int64, flags int) (errno int)