R=rsc, brainman, ality, r2, r

CC=golang-dev
https://golang.org/cl/3816043

src/pkg/syscall/Makefile

@@ -32,6 +32,9 @@ GOFILES_linux=\
 
 GOFILES_windows=\
 	exec_windows.go
+	
+GOFILES_plan9=\
+	exec_plan9.go
 
 OFILES=\
 	asm_$(GOOS)_$(GOARCH).$O\

src/pkg/syscall/asm_plan9_386.s

@@ -0,0 +1,151 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//
+// System call support for 386, Plan 9
+//
+
+//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
+//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
+//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
+//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
+
+// Trap # in AX, args on stack above caller pc.
+TEXT	·Syscall(SB),7,$0
+	CALL	runtime·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$64
+	MOVL	AX, r1+20(SP)
+	MOVL	$0, r2+24(SP)
+	CMPL	AX, $-1
+	JNE	ok3
+
+	SUBL	$8, SP
+	CALL	syscall·errstr(SB)
+	MOVL	SP, SI
+	ADDL	$8, SP
+	JMP	copyresult3
+	
+ok3:
+	LEAL	runtime·emptystring(SB), SI	
+	
+copyresult3:
+	LEAL	err+28(SP), DI
+
+	CLD
+	MOVSL
+	MOVSL
+
+	CALL	runtime·exitsyscall(SB)
+	RET
+
+TEXT	·Syscall6(SB),7,$0
+	CALL	runtime·entersyscall(SB)
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$64
+	MOVL	AX, r1+32(SP)
+	MOVL	$0, r2+36(SP)
+	CMPL	AX, $-1
+	JNE	ok4
+	
+	SUBL	$8, SP
+	CALL	syscall·errstr(SB)
+	MOVL	SP, SI
+	ADDL	$8, SP
+	JMP	copyresult4
+	
+ok4:
+	LEAL	runtime·emptystring(SB), SI
+	
+copyresult4:
+	LEAL	err+40(SP), DI
+
+	CLD
+	MOVSL
+	MOVSL
+
+	CALL	runtime·exitsyscall(SB)
+	RET
+
+TEXT ·RawSyscall(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$64
+	MOVL	AX, r1+20(SP)
+	MOVL	AX, r2+24(SP)
+	MOVL	AX, err+28(SP)
+	RET
+
+TEXT	·RawSyscall6(SB),7,$0
+	MOVL	4(SP), AX	// syscall entry
+	// slide args down on top of system call number
+	LEAL		8(SP), SI
+	LEAL		4(SP), DI
+	CLD
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	MOVSL
+	INT	$64
+	MOVL	AX, r1+32(SP)
+	MOVL	AX, r2+36(SP)
+	MOVL	AX, err+40(SP)		
+	RET
+
+#define SYS_SEEK 39	/* from zsysnum_plan9_386.go */
+
+//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
+TEXT ·seek(SB),7,$0
+	LEAL	newoffset+24(SP), AX
+	MOVL	AX, placeholder+4(SP)
+	
+	MOVL	$SYS_SEEK, AX	// syscall entry
+	INT	$64
+	
+	CMPL	AX, $-1
+	JNE	ok6
+	MOVL	AX, 24(SP)	// newoffset low
+	MOVL	AX, 28(SP)	// newoffset high
+	
+	SUBL	$8, SP
+	CALL	syscall·errstr(SB)
+	MOVL	SP, SI
+	ADDL	$8, SP	
+	JMP	copyresult6
+	
+ok6:
+	LEAL	runtime·emptystring(SB), SI
+	
+copyresult6:
+	LEAL	err+32(SP), DI
+
+	CLD
+	MOVSL
+	MOVSL
+	RET

src/pkg/syscall/exec_plan9.go

@@ -0,0 +1,521 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Fork, exec, wait, etc.
+
+package syscall
+
+import (
+	"sync"
+	"unsafe"
+)
+
+// Lock synchronizing creation of new file descriptors with fork.
+//
+// We want the child in a fork/exec sequence to inherit only the
+// file descriptors we intend.  To do that, we mark all file
+// descriptors close-on-exec and then, in the child, explicitly
+// unmark the ones we want the exec'ed program to keep.
+// Unix doesn't make this easy: there is, in general, no way to
+// allocate a new file descriptor close-on-exec.  Instead you
+// have to allocate the descriptor and then mark it close-on-exec.
+// If a fork happens between those two events, the child's exec
+// will inherit an unwanted file descriptor.
+//
+// This lock solves that race: the create new fd/mark close-on-exec
+// operation is done holding ForkLock for reading, and the fork itself
+// is done holding ForkLock for writing.  At least, that's the idea.
+// There are some complications.
+//
+// Some system calls that create new file descriptors can block
+// for arbitrarily long times: open on a hung NFS server or named
+// pipe, accept on a socket, and so on.  We can't reasonably grab
+// the lock across those operations.
+//
+// It is worse to inherit some file descriptors than others.
+// If a non-malicious child accidentally inherits an open ordinary file,
+// that's not a big deal.  On the other hand, if a long-lived child
+// accidentally inherits the write end of a pipe, then the reader
+// of that pipe will not see EOF until that child exits, potentially
+// causing the parent program to hang.  This is a common problem
+// in threaded C programs that use popen.
+//
+// Luckily, the file descriptors that are most important not to
+// inherit are not the ones that can take an arbitrarily long time
+// to create: pipe returns instantly, and the net package uses
+// non-blocking I/O to accept on a listening socket.
+// The rules for which file descriptor-creating operations use the
+// ForkLock are as follows:
+//
+// 1) Pipe.    Does not block.  Use the ForkLock.
+// 2) Socket.  Does not block.  Use the ForkLock.
+// 3) Accept.  If using non-blocking mode, use the ForkLock.
+//             Otherwise, live with the race.
+// 4) Open.    Can block.  Use O_CLOEXEC if available (Linux).
+//             Otherwise, live with the race.
+// 5) Dup.     Does not block.  Use the ForkLock.
+//             On Linux, could use fcntl F_DUPFD_CLOEXEC
+//             instead of the ForkLock, but only for dup(fd, -1).
+
+var ForkLock sync.RWMutex
+
+// Convert array of string to array
+// of NUL-terminated byte pointer.
+func StringArrayPtr(ss []string) []*byte {
+	bb := make([]*byte, len(ss)+1)
+	for i := 0; i < len(ss); i++ {
+		bb[i] = StringBytePtr(ss[i])
+	}
+	bb[len(ss)] = nil
+	return bb
+}
+
+// gbit16 reads a 16-bit numeric value from a 9P protocol message strored in b,
+// returning the value and the remaining slice of b.
+func gbit16(b []byte) (uint16, []byte) {
+	return uint16(b[0]) | uint16(b[1])<<8, b[2:]
+}
+
+// gstring reads a string from a 9P protocol message strored in b,
+// returning the value as a Go string and the remaining slice of b.
+func gstring(b []byte) (string, []byte) {
+	n, b := gbit16(b)
+	return string(b[0:n]), b[n:]
+}
+
+// readdirnames returns the names of files inside the directory represented by dirfd.
+func readdirnames(dirfd int) (names []string, err Error) {
+	result := make([]string, 0, 100)
+	var buf [STATMAX]byte
+
+	for {
+		n, e := Read(dirfd, buf[:])
+		if e != nil {
+			return []string{}, e
+		}
+		if n == 0 {
+			break
+		}
+
+		for i := 0; i < n; {
+			m, _ := gbit16(buf[i:])
+			m += 2
+
+			if m < STATFIXLEN {
+				return []string{}, NewError("malformed stat buffer")
+			}
+
+			name, _ := gstring(buf[i+41:])
+			result = append(result, name)
+
+			i += int(m)
+		}
+	}
+	return []string{}, nil
+}
+
+// readdupdevice returns a list of currently opened fds (excluding stdin, stdout, stderr) from the dup device #d.
+// ForkLock should be write locked before calling, so that no new fds would be created while the fd list is being read.
+func readdupdevice() (fds []int, err Error) {
+	dupdevfd, err := Open("#d", O_RDONLY)
+
+	if err != nil {
+		return
+	}
+	defer Close(dupdevfd)
+
+	fileNames, err := readdirnames(dupdevfd)
+	if err != nil {
+		return
+	}
+
+	fds = make([]int, 0, len(fileNames)>>1)
+	for _, fdstr := range fileNames {
+		if l := len(fdstr); l > 2 && fdstr[l-3] == 'c' && fdstr[l-2] == 't' && fdstr[l-1] == 'l' {
+			continue
+		}
+
+		fd := int(atoi([]byte(fdstr)))
+
+		if fd == 0 || fd == 1 || fd == 2 || fd == dupdevfd {
+			continue
+		}
+
+		fds = append(fds, fd)
+	}
+
+	return fds[0:len(fds)], nil
+}
+
+var startupFds []int
+
+// Plan 9 does not allow clearing the OCEXEC flag
+// from the underlying channel backing an open file descriptor,
+// therefore we store a list of already opened file descriptors
+// inside startupFds and skip them when manually closing descriptors
+// not meant to be passed to a child exec.
+func init() {
+	startupFds, _ = readdupdevice()
+}
+
+// forkAndExecInChild forks the process, calling dup onto 0..len(fd)
+// and finally invoking exec(argv0, argvv, envv) in the child.
+// If a dup or exec fails, it writes the error string to pipe.
+// (The pipe write end is close-on-exec so if exec succeeds, it will be closed.)
+//
+// In the child, this function must not acquire any locks, because
+// they might have been locked at the time of the fork.  This means
+// no rescheduling, no malloc calls, and no new stack segments.
+// The calls to RawSyscall are okay because they are assembly
+// functions that do not grow the stack.
+func forkAndExecInChild(argv0 *byte, argv []*byte, envv []envItem, chroot, dir *byte, attr *ProcAttr, fdsToClose []int, pipe int) (pid int, err Error) {
+	// Declare all variables at top in case any
+	// declarations require heap allocation (e.g., errbuf).
+	var (
+		r1       uintptr
+		nextfd   int
+		i        int
+		clearenv int
+		envfd    int
+		errbuf   [ERRMAX]byte
+	)
+
+	// guard against side effects of shuffling fds below.
+	fd := append([]int(nil), attr.Files...)
+
+	if envv != nil {
+		clearenv = RFCENVG
+	}
+
+	// About to call fork.
+	// No more allocation or calls of non-assembly functions.
+	r1, _, _ = RawSyscall(SYS_RFORK, uintptr(RFPROC|RFFDG|RFREND|clearenv), 0, 0)
+
+	if r1 != 0 {
+		if int(r1) == -1 {
+			return 0, NewError(errstr())
+		}
+		// parent; return PID
+		return int(r1), nil
+	}
+
+	// Fork succeeded, now in child.
+
+	// Close fds we don't need.
+	for i = 0; i < len(fdsToClose); i++ {
+		r1, _, _ = RawSyscall(SYS_CLOSE, uintptr(fdsToClose[i]), 0, 0)
+		if int(r1) == -1 {
+			goto childerror
+		}
+	}
+
+	if envv != nil {
+		// Write new environment variables.
+		for i = 0; i < len(envv); i++ {
+			r1, _, _ = RawSyscall(SYS_CREATE, uintptr(unsafe.Pointer(envv[i].name)), uintptr(O_WRONLY), uintptr(0666))
+
+			if int(r1) == -1 {
+				goto childerror
+			}
+
+			envfd = int(r1)
+
+			r1, _, _ = RawSyscall6(SYS_PWRITE, uintptr(envfd), uintptr(unsafe.Pointer(envv[i].value)), uintptr(envv[i].nvalue),
+				^uintptr(0), ^uintptr(0), 0)
+
+			if int(r1) == -1 || int(r1) != envv[i].nvalue {
+				goto childerror
+			}
+
+			r1, _, _ = RawSyscall(SYS_CLOSE, uintptr(envfd), 0, 0)
+
+			if int(r1) == -1 {
+				goto childerror
+			}
+		}
+	}
+
+	// Chdir
+	if dir != nil {
+		r1, _, _ = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
+		if int(r1) == -1 {
+			goto childerror
+		}
+	}
+
+	// Pass 1: look for fd[i] < i and move those up above len(fd)
+	// so that pass 2 won't stomp on an fd it needs later.
+	nextfd = int(len(fd))
+	if pipe < nextfd {
+		r1, _, _ = RawSyscall(SYS_DUP, uintptr(pipe), uintptr(nextfd), 0)
+		if int(r1) == -1 {
+			goto childerror
+		}
+		pipe = nextfd
+		nextfd++
+	}
+	for i = 0; i < len(fd); i++ {
+		if fd[i] >= 0 && fd[i] < int(i) {
+			r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(nextfd), 0)
+			if int(r1) == -1 {
+				goto childerror
+			}
+
+			fd[i] = nextfd
+			nextfd++
+			if nextfd == pipe { // don't stomp on pipe
+				nextfd++
+			}
+		}
+	}
+
+	// Pass 2: dup fd[i] down onto i.
+	for i = 0; i < len(fd); i++ {
+		if fd[i] == -1 {
+			RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
+			continue
+		}
+		if fd[i] == int(i) {
+			continue
+		}
+
+		r1, _, _ = RawSyscall(SYS_DUP, uintptr(fd[i]), uintptr(i), 0)
+		if int(r1) == -1 {
+			goto childerror
+		}
+		RawSyscall(SYS_CLOSE, uintptr(fd[i]), 0, 0)
+	}
+
+	// Time to exec.
+	r1, _, _ = RawSyscall(SYS_EXEC,
+		uintptr(unsafe.Pointer(argv0)),
+		uintptr(unsafe.Pointer(&argv[0])), 0)
+
+childerror:
+	// send error string on pipe
+	RawSyscall(SYS_ERRSTR, uintptr(unsafe.Pointer(&errbuf[0])), uintptr(len(errbuf)), 0)
+	errbuf[len(errbuf)-1] = 0
+	i = 0
+	for i < len(errbuf) && errbuf[i] != 0 {
+		i++
+	}
+
+	RawSyscall6(SYS_PWRITE, uintptr(pipe), uintptr(unsafe.Pointer(&errbuf[0])), uintptr(i),
+		^uintptr(0), ^uintptr(0), 0)
+
+	for {
+		RawSyscall(SYS_EXITS, 0, 0, 0)
+	}
+
+	// Calling panic is not actually safe,
+	// but the for loop above won't break
+	// and this shuts up the compiler.
+	panic("unreached")
+}
+
+func cexecPipe(p []int) Error {
+	e := Pipe(p)
+	if e != nil {
+		return e
+	}
+
+	fd, e := Open("#d/"+itoa(p[1]), O_CLOEXEC)
+	if e != nil {
+		Close(p[0])
+		Close(p[1])
+		return e
+	}
+
+	Close(fd)
+	return nil
+}
+
+type envItem struct {
+	name   *byte
+	value  *byte
+	nvalue int
+}
+
+type ProcAttr struct {
+	Dir    string   // Current working directory.
+	Env    []string // Environment.
+	Files  []int    // File descriptors.
+	Chroot string   // Chroot.
+}
+
+var zeroAttributes ProcAttr
+
+
+func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err Error) {
+	var (
+		p      [2]int
+		n      int
+		errbuf [ERRMAX]byte
+		wmsg   Waitmsg
+	)
+
+	if attr == nil {
+		attr = &zeroAttributes
+	}
+
+	p[0] = -1
+	p[1] = -1
+
+	// Convert args to C form.
+	argv0p := StringBytePtr(argv[0])
+	argvp := StringArrayPtr(argv)
+
+	var chroot *byte
+	if attr.Chroot != "" {
+		chroot = StringBytePtr(attr.Chroot)
+	}
+	var dir *byte
+	if attr.Dir != "" {
+		dir = StringBytePtr(attr.Dir)
+	}
+	var envvParsed []envItem
+	if attr.Env != nil {
+		envvParsed = make([]envItem, 0, len(attr.Env))
+		for _, v := range attr.Env {
+			i := 0
+			for i < len(v) && v[i] != '=' {
+				i++
+			}
+
+			envvParsed = append(envvParsed, envItem{StringBytePtr("/env/" + v[:i]), StringBytePtr(v[i+1:]), len(v) - i})
+		}
+	}
+
+	// Acquire the fork lock to prevent other threads from creating new fds before we fork.
+	ForkLock.Lock()
+
+	// get a list of open fds, excluding stdin,stdout and stderr that need to be closed in the child.
+	// no new fds can be created while we hold the ForkLock for writing.
+	openFds, e := readdupdevice()
+
+	if e != nil {
+		ForkLock.Unlock()
+		return 0, e
+	}
+
+	fdsToClose := make([]int, 0, len(openFds))
+	// exclude fds opened from startup from the list of fds to be closed.
+	for _, fd := range openFds {
+		isReserved := false
+		for _, reservedFd := range startupFds {
+			if fd == reservedFd {
+				isReserved = true
+				break
+			}
+		}
+
+		if !isReserved {
+			fdsToClose = append(fdsToClose, fd)
+		}
+	}
+
+	// exclude fds requested by the caller from the list of fds to be closed.
+	for _, fd := range openFds {
+		isReserved := false
+		for _, reservedFd := range attr.Files {
+			if fd == reservedFd {
+				isReserved = true
+				break
+			}
+		}
+
+		if !isReserved {
+			fdsToClose = append(fdsToClose, fd)
+		}
+	}
+
+	// Allocate child status pipe close on exec.	
+	e = cexecPipe(p[:])
+
+	if e != nil {
+		return 0, e
+	}
+	fdsToClose = append(fdsToClose, p[0])
+
+	// Kick off child.
+	pid, err = forkAndExecInChild(argv0p, argvp, envvParsed, chroot, dir, attr, fdsToClose, p[1])
+
+	if err != nil {
+		if p[0] >= 0 {
+			Close(p[0])
+			Close(p[1])
+		}
+		ForkLock.Unlock()
+		return 0, err
+	}
+	ForkLock.Unlock()
+
+	// Read child error status from pipe.
+	Close(p[1])
+	n, err = Read(p[0], errbuf[:])
+	Close(p[0])
+
+	if err != nil || n != 0 {
+		if n != 0 {
+			err = NewError(string(errbuf[:]))
+		}
+
+		// Child failed; wait for it to exit, to make sure
+		// the zombies don't accumulate.
+		for wmsg.Pid != pid {
+			Await(&wmsg)
+		}
+		return 0, err
+	}
+
+	// Read got EOF, so pipe closed on exec, so exec succeeded.
+	return pid, nil
+}
+
+// Combination of fork and exec, careful to be thread safe.
+func ForkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err Error) {
+	return forkExec(argv0, argv, attr)
+}
+
+// StartProcess wraps ForkExec for package os.
+func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid, handle int, err Error) {
+	pid, err = forkExec(argv0, argv, attr)
+	return pid, 0, err
+}
+
+// Ordinary exec.
+func Exec(argv0 string, argv []string, envv []string) (err Error) {
+	if envv != nil {
+		r1, _, _ := RawSyscall(SYS_RFORK, RFCENVG, 0, 0)
+		if int(r1) == -1 {
+			return NewError(errstr())
+		}
+
+		for _, v := range envv {
+			i := 0
+			for i < len(v) && v[i] != '=' {
+				i++
+			}
+
+			fd, e := Create("/env/"+v[:i], O_WRONLY, 0666)
+			if e != nil {
+				return e
+			}
+
+			_, e = Write(fd, []byte(v[i+1:]))
+			if e != nil {
+				Close(fd)
+				return e
+			}
+			Close(fd)
+		}
+	}
+
+	_, _, e := Syscall(SYS_EXEC,
+		uintptr(unsafe.Pointer(StringBytePtr(argv0))),
+		uintptr(unsafe.Pointer(&StringArrayPtr(argv)[0])),
+		0)
+
+	return NewError(e)
+}

src/pkg/syscall/mkall.sh

@@ -145,6 +145,12 @@ windows_386)
 	mktypes=
 	mkerrors="./mkerrors_windows.sh -f -m32"
 	;;
+plan9_386)
+	mkerrors=
+	mksyscall="./mksyscall.pl -l32 -plan9"
+	mksysnum="./mksysnum_plan9.sh /n/sources/plan9/sys/src/libc/9syscall/sys.h"
+	mktypes="godefs -gsyscall -f -m32"
+	;;
 *)
 	echo 'unrecognized $GOOS_$GOARCH: ' "$GOOSARCH" 1>&2
 	exit 1

src/pkg/syscall/mksyscall.pl

@@ -23,6 +23,7 @@ $cmdline = "mksyscall.pl " . join(' ', @ARGV);
 $errors = 0;
 $_32bit = "";
 $nacl = 0;
+$plan9 = 0;
 
 if($ARGV[0] eq "-b32") {
 	$_32bit = "big-endian";
@@ -35,6 +36,10 @@ if($ARGV[0] eq "-nacl") {
 	$nacl = 1;
 	shift;
 }
+if($ARGV[0] eq "-plan9") {
+	$plan9 = 1;
+	shift;
+}
 
 if($ARGV[0] =~ /^-/) {
 	print STDERR "usage: mksyscall.pl [-b32 | -l32] [file ...]\n";
@@ -160,9 +165,13 @@ while(<>) {
 		my $p = $out[$i];
 		my ($name, $type) = parseparam($p);
 		my $reg = "";
-		if($name eq "errno") {
+		if($name eq "errno" && !$plan9) {
 			$reg = "e1";
 			$ret[2] = $reg;
+		} elsif ($name eq "err" && $plan9) {
+			$ret[0] = "r0";			
+			$ret[2] = "e1";
+			next;
 		} else {
 			$reg = sprintf("r%d", $i);
 			$ret[$i] = $reg;
@@ -191,6 +200,13 @@ while(<>) {
 		$text .= "\t$ret[0], $ret[1], $ret[2] := $call\n";
 	}
 	$text .= $body;
+	
+	if ($plan9 && $ret[2] eq "e1") {
+		$text .= "\terr = nil\n";
+		$text .= "\tif int(r0) == -1 {\n";
+		$text .= "\t\t err = NewError(e1)\n";
+		$text .= "\t}\n";
+	}
 
 	$text .= "\treturn\n";
 	$text .= "}\n\n";

src/pkg/syscall/mksysnum_plan9.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+COMMAND="mksysnum_plan9.sh $@"
+
+cat <<EOF
+// $COMMAND
+// MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
+
+package syscall
+
+const(
+EOF
+
+SP='[ 	]' # space or tab
+sed "s/^#define${SP}\\([A-Z0-9_][A-Z0-9_]*\\)${SP}${SP}*\\([0-9][0-9]*\\)/SYS_\\1=\\2/g" \
+	< $1 | grep -v SYS__
+
+cat <<EOF
+)
+EOF

src/pkg/syscall/str.go

@@ -4,9 +4,9 @@
 
 package syscall
 
-func str(val int) string { // do it here rather than with fmt to avoid dependency
+func itoa(val int) string { // do it here rather than with fmt to avoid dependency
 	if val < 0 {
-		return "-" + str(-val)
+		return "-" + itoa(-val)
 	}
 	var buf [32]byte // big enough for int64
 	i := len(buf) - 1

src/pkg/syscall/syscall_linux.go

@@ -60,7 +60,7 @@ func Futimesat(dirfd int, path string, tv []Timeval) (errno int) {
 func Futimes(fd int, tv []Timeval) (errno int) {
 	// Believe it or not, this is the best we can do on Linux
 	// (and is what glibc does).
-	return Utimes("/proc/self/fd/"+str(fd), tv)
+	return Utimes("/proc/self/fd/"+itoa(fd), tv)
 }
 
 const ImplementsGetwd = true

src/pkg/syscall/syscall_plan9.go

@@ -0,0 +1,343 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Plan 9 system calls.
+// This file is compiled as ordinary Go code,
+// but it is also input to mksyscall,
+// which parses the //sys lines and generates system call stubs.
+// Note that sometimes we use a lowercase //sys name and
+// wrap it in our own nicer implementation.
+
+package syscall
+
+import "unsafe"
+
+const OS = "plan9"
+
+const ImplementsGetwd = true
+
+// An Error can represent any printable error condition.
+type Error interface {
+	String() string
+}
+
+// ErrorString implements Error's String method by returning itself.
+type ErrorString string
+
+func (e ErrorString) String() string { return string(e) }
+
+// NewError converts s to an ErrorString, which satisfies the Error interface.
+func NewError(s string) Error { return ErrorString(s) }
+
+var (
+	Stdin  = 0
+	Stdout = 1
+	Stderr = 2
+
+	EISDIR Error = NewError("file is a directory")
+)
+
+func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
+func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
+func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
+func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
+
+func atoi(b []byte) (n uint) {
+	n = 0
+	for i := 0; i < len(b); i++ {
+		n = n*10 + uint(b[i]-'0')
+	}
+	return
+}
+
+func cstring(s []byte) string {
+	for i, _ := range s {
+		if s[i] == 0 {
+			return string(s[0:i])
+		}
+	}
+	return string(s)
+}
+
+func errstr() string {
+	var buf [ERRMAX]byte
+
+	RawSyscall(SYS_ERRSTR, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)), 0)
+
+	buf[len(buf)-1] = 0
+	return cstring(buf[:])
+}
+
+func Getpagesize() int { return 4096 }
+
+//sys	exits(msg *byte)
+func Exits(msg *string) {
+	if msg == nil {
+		exits(nil)
+	}
+
+	exits(StringBytePtr(*msg))
+}
+
+func Exit(code int) {
+	if code == 0 {
+		Exits(nil)
+	}
+
+	msg := itoa(code)
+	Exits(&msg)
+}
+
+func readnum(path string) (uint, Error) {
+	var b [12]byte
+
+	fd, e := Open(path, O_RDONLY)
+	if e != nil {
+		return 0, e
+	}
+	defer Close(fd)
+
+	n, e := Pread(fd, b[:], 0)
+
+	if e != nil {
+		return 0, e
+	}
+
+	m := 0
+	for ; m < n && b[m] == ' '; m++ {
+	}
+
+	return atoi(b[m : n-1]), nil
+}
+
+func Getpid() (pid int) {
+	n, _ := readnum("#c/pid")
+	return int(n)
+}
+
+func Getppid() (ppid int) {
+	n, _ := readnum("#c/ppid")
+	return int(n)
+}
+
+
+func Read(fd int, p []byte) (n int, err Error) {
+	return Pread(fd, p, -1)
+}
+
+func Write(fd int, p []byte) (n int, err Error) {
+	return Pwrite(fd, p, -1)
+}
+
+func Getwd() (wd string, err Error) {
+	fd, e := Open(".", O_RDONLY)
+
+	if e != nil {
+		return "", e
+	}
+	defer Close(fd)
+
+	return Fd2path(fd)
+}
+
+//sys	fd2path(fd int, buf []byte) (err Error)
+func Fd2path(fd int) (path string, err Error) {
+	var buf [512]byte
+
+	e := fd2path(fd, buf[:])
+	if e != nil {
+		return "", e
+	}
+	return cstring(buf[:]), nil
+}
+
+//sys	pipe(p *[2]_C_int) (err Error)
+func Pipe(p []int) (err Error) {
+	if len(p) != 2 {
+		return NewError("bad arg in system call")
+	}
+	var pp [2]_C_int
+	err = pipe(&pp)
+	p[0] = int(pp[0])
+	p[1] = int(pp[1])
+	return
+}
+
+
+//sys	sleep(millisecs int32) (err Error)
+func Sleep(nsec int64) (err Error) {
+	return sleep(int32((nsec + 999) / 1e6)) // round up to microsecond
+}
+
+// Underlying system call writes to newoffset via pointer.
+// Implemented in assembly to avoid allocation.
+func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
+
+func Seek(fd int, offset int64, whence int) (newoffset int64, err Error) {
+	newoffset, e := seek(0, fd, offset, whence)
+
+	err = nil
+	if newoffset == -1 {
+		err = NewError(e)
+	}
+	return
+}
+
+func Mkdir(path string, mode uint32) (err Error) {
+	fd, err := Create(path, O_RDONLY, DMDIR|mode)
+
+	if fd != -1 {
+		Close(fd)
+	}
+
+	return
+}
+
+type Waitmsg struct {
+	Pid  int
+	Time [3]uint32
+	Msg  string
+}
+
+//sys	await(s []byte) (n int, err Error)
+func Await(w *Waitmsg) (err Error) {
+	var buf [512]byte
+	var f [5][]byte
+
+	n, err := await(buf[:])
+
+	if err != nil || w == nil {
+		return
+	}
+
+	nf := 0
+	p := 0
+	for i := 0; i < n && nf < len(f)-1; i++ {
+		if buf[i] == ' ' {
+			f[nf] = buf[p:i]
+			p = i + 1
+			nf++
+		}
+	}
+	f[nf] = buf[p:]
+	nf++
+
+	if nf != len(f) {
+		return NewError("invalid wait message")
+	}
+	w.Pid = int(atoi(f[0]))
+	w.Time[0] = uint32(atoi(f[1]))
+	w.Time[1] = uint32(atoi(f[2]))
+	w.Time[2] = uint32(atoi(f[3]))
+	w.Msg = string(f[4])
+	return
+}
+
+func Unmount(name, old string) (err Error) {
+	oldp := uintptr(unsafe.Pointer(StringBytePtr(old)))
+
+	var r0 uintptr
+	var e string
+
+	// bind(2) man page: If name is zero, everything bound or mounted upon old is unbound or unmounted.
+	if name == "" {
+		r0, _, e = Syscall(SYS_UNMOUNT, _zero, oldp, 0)
+	} else {
+		r0, _, e = Syscall(SYS_UNMOUNT, uintptr(unsafe.Pointer(StringBytePtr(name))), oldp, 0)
+	}
+
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e)
+	}
+	return
+}
+
+func Fchdir(fd int) (err Error) {
+	path, err := Fd2path(fd)
+
+	if err != nil {
+		return
+	}
+
+	return Chdir(path)
+}
+
+type Timeval struct {
+	Sec  int32
+	Usec int32
+}
+
+func NsecToTimeval(nsec int64) (tv Timeval) {
+	nsec += 999 // round up to microsecond
+	tv.Usec = int32(nsec % 1e9 / 1e3)
+	tv.Sec = int32(nsec / 1e9)
+	return
+}
+
+func DecodeBintime(b []byte) (nsec int64, err Error) {
+	if len(b) != 8 {
+		return -1, NewError("bad /dev/bintime format")
+	}
+	err = nil
+	nsec = int64(b[0])<<56 |
+		int64(b[1])<<48 |
+		int64(b[2])<<40 |
+		int64(b[3])<<32 |
+		int64(b[4])<<24 |
+		int64(b[5])<<16 |
+		int64(b[6])<<8 |
+		int64(b[7])
+	return
+}
+
+func Gettimeofday(tv *Timeval) (err Error) {
+	// TODO(paulzhol): 
+	// avoid reopening a file descriptor for /dev/bintime on each call,
+	// use lower-level calls to avoid allocation.
+
+	var b [8]byte
+	var nsec int64
+
+	fd, e := Open("/dev/bintime", O_RDONLY)
+	if e != nil {
+		return e
+	}
+	defer Close(fd)
+
+	if _, e = Pread(fd, b[:], 0); e != nil {
+		return e
+	}
+
+	if nsec, e = DecodeBintime(b[:]); e != nil {
+		return e
+	}
+	*tv = NsecToTimeval(nsec)
+
+	return e
+}
+
+func Getegid() (egid int) { return -1 }
+func Geteuid() (euid int) { return -1 }
+func Getgid() (gid int)   { return -1 }
+func Getuid() (uid int)   { return -1 }
+
+func Getgroups() (gids []int, err Error) {
+	return make([]int, 0), nil
+}
+
+//sys	Dup(oldfd int, newfd int) (fd int, err Error)
+//sys	Open(path string, mode int) (fd int, err Error)
+//sys	Create(path string, mode int, perm uint32) (fd int, err Error)
+//sys	Remove(path string) (err Error)
+//sys	Pread(fd int, p []byte, offset int64) (n int, err Error)
+//sys	Pwrite(fd int, p []byte, offset int64) (n int, err Error)
+//sys	Close(fd int) (err Error)
+//sys	Chdir(path string) (err Error)
+//sys	Bind(name string, old string, flag int) (err Error)
+//sys	Mount(fd int, afd int, old string, flag int, aname string) (err Error)
+//sys	Stat(path string, edir []byte) (n int, err Error)
+//sys	Fstat(fd int, edir []byte) (n int, err Error)
+//sys	Wstat(path string, edir []byte) (err Error)
+//sys	Fwstat(fd int, edir []byte) (err Error)

src/pkg/syscall/syscall_plan9_386.go

@@ -0,0 +1,5 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall

src/pkg/syscall/syscall_unix.go

@@ -17,7 +17,7 @@ func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
 
 func Errstr(errno int) string {
 	if errno < 0 || errno >= int(len(errors)) {
-		return "error " + str(errno)
+		return "error " + itoa(errno)
 	}
 	return errors[errno]
 }

src/pkg/syscall/syscall_windows.go

@@ -175,7 +175,7 @@ func Errstr(errno int) string {
 	b := make([]uint16, 300)
 	n, err := FormatMessage(flags, 0, uint32(errno), 0, b, nil)
 	if err != 0 {
-		return "error " + str(errno) + " (FormatMessage failed with err=" + str(err) + ")"
+		return "error " + itoa(errno) + " (FormatMessage failed with err=" + itoa(err) + ")"
 	}
 	// trim terminating \r and \n
 	for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- {

src/pkg/syscall/types_plan9.c

@@ -0,0 +1,115 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Input to godefs.  See also mkerrors.sh and mkall.sh
+*/
+
+typedef unsigned short ushort;
+typedef unsigned char uchar;
+typedef unsigned long ulong;
+typedef unsigned int uint;
+typedef long long vlong;
+typedef unsigned long long uvlong;
+
+typedef int $_C_int;
+
+enum {
+	OREAD	= 0,	// open for read
+	OWRITE	= 1,	// write
+	ORDWR	= 2,	// read and write
+
+	$O_RDONLY	= OREAD,
+	$O_WRONLY	= OWRITE,
+	$O_RDWR		= ORDWR,
+
+	OEXEC	= 3,	// execute, == read but check execute permission
+	OTRUNC	= 16,	// or'ed in (except for exec), truncate file first
+	OCEXEC	= 32,	// or'ed in, close on exec
+
+	$O_CLOEXEC  = OCEXEC,
+
+	ORCLOSE	= 64,		// or'ed in, remove on close
+	OEXCL	= 0x1000,	// or'ed in, exclusive use (create only)
+	$O_EXCL	= OEXCL,
+
+	$STATMAX	= 65535U,
+	$ERRMAX		= 128,
+
+	$MORDER		= 0x0003,	// mask for bits defining order of mounting
+	$MREPL		= 0x0000,	// mount replaces object
+	$MBEFORE	= 0x0001,	// mount goes before others in union directory
+	$MAFTER		= 0x0002,	// mount goes after others in union directory
+	$MCREATE	= 0x0004,	// permit creation in mounted directory
+	$MCACHE		= 0x0010,	// cache some data
+	$MMASK		= 0x0017,	// all bits on
+
+	$RFNAMEG	= (1<<0),
+	$RFENVG		= (1<<1),
+	$RFFDG		= (1<<2),
+	$RFNOTEG	= (1<<3),
+	$RFPROC		= (1<<4),
+	$RFMEM		= (1<<5),
+	$RFNOWAIT	= (1<<6),
+	$RFCNAMEG	= (1<<10),
+	$RFCENVG	= (1<<11),
+	$RFCFDG		= (1<<12),
+	$RFREND		= (1<<13),
+	$RFNOMNT	= (1<<14),
+
+	// bits in Qid.type
+	$QTDIR		= 0x80,		// type bit for directories
+	$QTAPPEND	= 0x40,		// type bit for append only files
+	$QTEXCL		= 0x20,		// type bit for exclusive use files
+	$QTMOUNT	= 0x10,		// type bit for mounted channel
+	$QTAUTH		= 0x08,		// type bit for authentication file
+	$QTTMP		= 0x04,		// type bit for not-backed-up file
+	$QTFILE		= 0x00,		// plain file
+
+
+	// bits in Dir.mode
+	$DMDIR		= 0x80000000,	// mode bit for directories
+	$DMAPPEND	= 0x40000000,	// mode bit for append only files
+	$DMEXCL		= 0x20000000,	// mode bit for exclusive use files
+	$DMMOUNT	= 0x10000000,	// mode bit for mounted channel
+	$DMAUTH		= 0x08000000,	// mode bit for authentication file
+	$DMTMP		= 0x04000000,	// mode bit for non-backed-up files
+	$DMREAD		= 0x4,		// mode bit for read permission
+	$DMWRITE	= 0x2,		// mode bit for write permission
+	$DMEXEC		= 0x1,		// mode bit for execute permission
+
+	BIT8SZ	= 1,
+	BIT16SZ	= 2,
+	BIT32SZ	= 4,
+	BIT64SZ	= 8,
+	QIDSZ = BIT8SZ+BIT32SZ+BIT64SZ,
+
+	// STATFIXLEN includes leading 16-bit count
+	// The count, however, excludes itself; total size is BIT16SZ+count
+	$STATFIXLEN = BIT16SZ+QIDSZ+5*BIT16SZ+4*BIT32SZ+1*BIT64SZ,	// amount of fixed length data in a stat buffer
+};
+
+
+struct Prof			// Per process profiling
+{
+	struct Plink	*pp;	// known to be 0(ptr)
+	struct Plink	*next;	// known to be 4(ptr)
+	struct Plink	*last;
+	struct Plink	*first;
+	ulong		pid;
+	ulong		what;
+};
+
+struct Tos {
+	struct Prof	prof;
+	uvlong		cyclefreq;	// cycle clock frequency if there is one, 0 otherwise
+	vlong		kcycles;	// cycles spent in kernel
+	vlong		pcycles;	// cycles spent in process (kernel + user)
+	ulong		pid;		// might as well put the pid here
+	ulong		clock;
+	// top of stack is here
+};
+
+typedef struct Prof $Prof;
+typedef struct Tos $Tos;

src/pkg/syscall/zerrors_plan9_386.go

@@ -0,0 +1,25 @@
+package syscall
+
+// Constants
+const (
+	// Invented values to support what package os expects.
+	O_CREAT    = 0x02000
+	O_NOCTTY   = 0x00000
+	O_TRUNC    = 0x00000
+	O_NONBLOCK = 0x00000
+	O_APPEND   = 0x00000
+	O_SYNC     = 0x00000
+	O_ASYNC    = 0x00000
+
+
+	S_IFMT   = 0x1f000
+	S_IFIFO  = 0x1000
+	S_IFCHR  = 0x2000
+	S_IFDIR  = 0x4000
+	S_IFBLK  = 0x6000
+	S_IFREG  = 0x8000
+	S_IFLNK  = 0xa000
+	S_IFSOCK = 0xc000
+)
+
+// Error table

src/pkg/syscall/zsyscall_plan9_386.go

@@ -0,0 +1,267 @@
+// mksyscall.pl -l32 -plan9 syscall_plan9.go syscall_plan9_386.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package syscall
+
+import "unsafe"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func exits(msg *byte) {
+	Syscall(SYS_EXITS, uintptr(unsafe.Pointer(msg)), 0, 0)
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func fd2path(fd int, buf []byte) (err Error) {
+	var _p0 unsafe.Pointer
+	if len(buf) > 0 {
+		_p0 = unsafe.Pointer(&buf[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_FD2PATH, uintptr(fd), uintptr(_p0), uintptr(len(buf)))
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func pipe(p *[2]_C_int) (err Error) {
+	r0, _, e1 := Syscall(SYS_PIPE, uintptr(unsafe.Pointer(p)), 0, 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func sleep(millisecs int32) (err Error) {
+	r0, _, e1 := Syscall(SYS_SLEEP, uintptr(millisecs), 0, 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func await(s []byte) (n int, err Error) {
+	var _p0 unsafe.Pointer
+	if len(s) > 0 {
+		_p0 = unsafe.Pointer(&s[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_AWAIT, uintptr(_p0), uintptr(len(s)), 0)
+	n = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Dup(oldfd int, newfd int) (fd int, err Error) {
+	r0, _, e1 := Syscall(SYS_DUP, uintptr(oldfd), uintptr(newfd), 0)
+	fd = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Open(path string, mode int) (fd int, err Error) {
+	r0, _, e1 := Syscall(SYS_OPEN, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(mode), 0)
+	fd = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Create(path string, mode int, perm uint32) (fd int, err Error) {
+	r0, _, e1 := Syscall(SYS_CREATE, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(mode), uintptr(perm))
+	fd = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Remove(path string) (err Error) {
+	r0, _, e1 := Syscall(SYS_REMOVE, uintptr(unsafe.Pointer(StringBytePtr(path))), 0, 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Pread(fd int, p []byte, offset int64) (n int, err Error) {
+	var _p0 unsafe.Pointer
+	if len(p) > 0 {
+		_p0 = unsafe.Pointer(&p[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall6(SYS_PREAD, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
+	n = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Pwrite(fd int, p []byte, offset int64) (n int, err Error) {
+	var _p0 unsafe.Pointer
+	if len(p) > 0 {
+		_p0 = unsafe.Pointer(&p[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall6(SYS_PWRITE, uintptr(fd), uintptr(_p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
+	n = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Close(fd int) (err Error) {
+	r0, _, e1 := Syscall(SYS_CLOSE, uintptr(fd), 0, 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Chdir(path string) (err Error) {
+	r0, _, e1 := Syscall(SYS_CHDIR, uintptr(unsafe.Pointer(StringBytePtr(path))), 0, 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Bind(name string, old string, flag int) (err Error) {
+	r0, _, e1 := Syscall(SYS_BIND, uintptr(unsafe.Pointer(StringBytePtr(name))), uintptr(unsafe.Pointer(StringBytePtr(old))), uintptr(flag))
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Mount(fd int, afd int, old string, flag int, aname string) (err Error) {
+	r0, _, e1 := Syscall6(SYS_MOUNT, uintptr(fd), uintptr(afd), uintptr(unsafe.Pointer(StringBytePtr(old))), uintptr(flag), uintptr(unsafe.Pointer(StringBytePtr(aname))), 0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Stat(path string, edir []byte) (n int, err Error) {
+	var _p0 unsafe.Pointer
+	if len(edir) > 0 {
+		_p0 = unsafe.Pointer(&edir[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_STAT, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(edir)))
+	n = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fstat(fd int, edir []byte) (n int, err Error) {
+	var _p0 unsafe.Pointer
+	if len(edir) > 0 {
+		_p0 = unsafe.Pointer(&edir[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_FSTAT, uintptr(fd), uintptr(_p0), uintptr(len(edir)))
+	n = int(r0)
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Wstat(path string, edir []byte) (err Error) {
+	var _p0 unsafe.Pointer
+	if len(edir) > 0 {
+		_p0 = unsafe.Pointer(&edir[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_WSTAT, uintptr(unsafe.Pointer(StringBytePtr(path))), uintptr(_p0), uintptr(len(edir)))
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fwstat(fd int, edir []byte) (err Error) {
+	var _p0 unsafe.Pointer
+	if len(edir) > 0 {
+		_p0 = unsafe.Pointer(&edir[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := Syscall(SYS_FWSTAT, uintptr(fd), uintptr(_p0), uintptr(len(edir)))
+	err = nil
+	if int(r0) == -1 {
+		err = NewError(e1)
+	}
+	return
+}

src/pkg/syscall/zsysnum_plan9_386.go

@@ -0,0 +1,47 @@
+// mksysnum_plan9.sh /media/sys/src/libc/9syscall/sys.h
+// MACHINE GENERATED BY THE ABOVE COMMAND; DO NOT EDIT
+
+package syscall
+
+const (
+	SYS_SYSR1      = 0
+	SYS_BIND       = 2
+	SYS_CHDIR      = 3
+	SYS_CLOSE      = 4
+	SYS_DUP        = 5
+	SYS_ALARM      = 6
+	SYS_EXEC       = 7
+	SYS_EXITS      = 8
+	SYS_FAUTH      = 10
+	SYS_SEGBRK     = 12
+	SYS_OPEN       = 14
+	SYS_OSEEK      = 16
+	SYS_SLEEP      = 17
+	SYS_RFORK      = 19
+	SYS_PIPE       = 21
+	SYS_CREATE     = 22
+	SYS_FD2PATH    = 23
+	SYS_BRK_       = 24
+	SYS_REMOVE     = 25
+	SYS_NOTIFY     = 28
+	SYS_NOTED      = 29
+	SYS_SEGATTACH  = 30
+	SYS_SEGDETACH  = 31
+	SYS_SEGFREE    = 32
+	SYS_SEGFLUSH   = 33
+	SYS_RENDEZVOUS = 34
+	SYS_UNMOUNT    = 35
+	SYS_SEMACQUIRE = 37
+	SYS_SEMRELEASE = 38
+	SYS_SEEK       = 39
+	SYS_FVERSION   = 40
+	SYS_ERRSTR     = 41
+	SYS_STAT       = 42
+	SYS_FSTAT      = 43
+	SYS_WSTAT      = 44
+	SYS_FWSTAT     = 45
+	SYS_MOUNT      = 46
+	SYS_AWAIT      = 47
+	SYS_PREAD      = 50
+	SYS_PWRITE     = 51
+)

src/pkg/syscall/ztypes_plan9_386.go

@@ -0,0 +1,74 @@
+// godefs -gsyscall -f -m32 types_plan9.c
+
+// MACHINE GENERATED - DO NOT EDIT.
+
+package syscall
+
+// Constants
+const (
+	O_RDONLY   = 0
+	O_WRONLY   = 0x1
+	O_RDWR     = 0x2
+	O_CLOEXEC  = 0x20
+	O_EXCL     = 0x1000
+	STATMAX    = 0xffff
+	ERRMAX     = 0x80
+	MORDER     = 0x3
+	MREPL      = 0
+	MBEFORE    = 0x1
+	MAFTER     = 0x2
+	MCREATE    = 0x4
+	MCACHE     = 0x10
+	MMASK      = 0x17
+	RFNAMEG    = 0x1
+	RFENVG     = 0x2
+	RFFDG      = 0x4
+	RFNOTEG    = 0x8
+	RFPROC     = 0x10
+	RFMEM      = 0x20
+	RFNOWAIT   = 0x40
+	RFCNAMEG   = 0x400
+	RFCENVG    = 0x800
+	RFCFDG     = 0x1000
+	RFREND     = 0x2000
+	RFNOMNT    = 0x4000
+	QTDIR      = 0x80
+	QTAPPEND   = 0x40
+	QTEXCL     = 0x20
+	QTMOUNT    = 0x10
+	QTAUTH     = 0x8
+	QTTMP      = 0x4
+	QTFILE     = 0
+	DMDIR      = 0x80000000
+	DMAPPEND   = 0x40000000
+	DMEXCL     = 0x20000000
+	DMMOUNT    = 0x10000000
+	DMAUTH     = 0x8000000
+	DMTMP      = 0x4000000
+	DMREAD     = 0x4
+	DMWRITE    = 0x2
+	DMEXEC     = 0x1
+	STATFIXLEN = 0x31
+)
+
+// Types
+
+type _C_int int32
+
+type Prof struct {
+	Pp    *[0]byte /* sPlink */
+	Next  *[0]byte /* sPlink */
+	Last  *[0]byte /* sPlink */
+	First *[0]byte /* sPlink */
+	Pid   uint32
+	What  uint32
+}
+
+type Tos struct {
+	Prof      Prof
+	Cyclefreq uint64
+	Kcycles   int64
+	Pcycles   int64
+	Pid       uint32
+	Clock     uint32
+}