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go.sys: copy files from syscall package to go.sys/{plan9,windows,unix}
This CL copies to each package of go.sys the files from syscall it will need.
Different directories have different files, but these:
mkall.sh
str.go
syscall.go
mksyscall.pl
race.go
race0.go
syscall_test.go
are copied to all three.
No changes yet, these are just copies. They are not ready to use yet:
package names are wrong, for starters. But this clean copy will make
it easier to follow the changes as the packages are enabled.
LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/126960043
This commit is contained in:
Rob Pike
@@ -0,0 +1,260 @@
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package syscall
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import (
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"sync"
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"sync/atomic"
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"unsafe"
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)
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// soError describes reasons for shared library load failures.
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type soError struct {
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Err error
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ObjName string
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Msg string
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}
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func (e *soError) Error() string { return e.Msg }
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// Implemented in ../runtime/syscall_solaris.goc.
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func rawSysvicall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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func sysvicall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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func dlclose(handle uintptr) (err Errno)
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func dlopen(name *uint8, mode uintptr) (handle uintptr, err Errno)
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func dlsym(handle uintptr, name *uint8) (proc uintptr, err Errno)
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// A so implements access to a single shared library object.
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type so struct {
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Name string
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Handle uintptr
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}
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// loadSO loads shared library file into memory.
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func loadSO(name string) (*so, error) {
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namep, err := BytePtrFromString(name)
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if err != nil {
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return nil, err
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}
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h, e := dlopen(namep, 1) // RTLD_LAZY
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if e != 0 {
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return nil, &soError{
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Err: e,
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ObjName: name,
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Msg: "Failed to load " + name + ": " + e.Error(),
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}
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}
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d := &so{
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Name: name,
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Handle: uintptr(h),
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}
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return d, nil
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}
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// mustLoadSO is like loadSO but panics if load operation fails.
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func mustLoadSO(name string) *so {
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d, e := loadSO(name)
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if e != nil {
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panic(e)
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}
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return d
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}
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// FindProc searches shared library d for procedure named name and returns
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// *proc if found. It returns an error if the search fails.
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func (d *so) FindProc(name string) (*proc, error) {
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namep, err := BytePtrFromString(name)
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if err != nil {
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return nil, err
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}
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a, _ := dlsym(uintptr(d.Handle), namep)
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if a == 0 {
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return nil, &soError{
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Err: ENOSYS,
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ObjName: name,
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Msg: "Failed to find " + name + " procedure in " + d.Name,
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}
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}
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p := &proc{
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SO: d,
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Name: name,
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addr: a,
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}
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return p, nil
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}
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// MustFindProc is like FindProc but panics if search fails.
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func (d *so) MustFindProc(name string) *proc {
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p, e := d.FindProc(name)
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if e != nil {
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panic(e)
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}
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return p
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}
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// Release unloads shared library d from memory.
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func (d *so) Release() (err error) {
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return dlclose(d.Handle)
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}
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// A proc implements access to a procedure inside a shared library.
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type proc struct {
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SO *so
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Name string
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addr uintptr
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}
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// Addr returns the address of the procedure represented by p.
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// The return value can be passed to Syscall to run the procedure.
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func (p *proc) Addr() uintptr {
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return p.addr
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}
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// Call executes procedure p with arguments a. It will panic, if more then
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// 6 arguments are supplied.
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//
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// The returned error is always non-nil, constructed from the result of
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// GetLastError. Callers must inspect the primary return value to decide
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// whether an error occurred (according to the semantics of the specific
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// function being called) before consulting the error. The error will be
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// guaranteed to contain syscall.Errno.
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func (p *proc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
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switch len(a) {
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case 0:
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return sysvicall6(p.Addr(), uintptr(len(a)), 0, 0, 0, 0, 0, 0)
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case 1:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], 0, 0, 0, 0, 0)
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case 2:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], a[1], 0, 0, 0, 0)
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case 3:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], 0, 0, 0)
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case 4:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], 0, 0)
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case 5:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], 0)
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case 6:
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return sysvicall6(p.Addr(), uintptr(len(a)), a[0], a[1], a[2], a[3], a[4], a[5])
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default:
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panic("Call " + p.Name + " with too many arguments " + itoa(len(a)) + ".")
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}
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return
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}
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// A lazySO implements access to a single shared library. It will delay
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// the load of the shared library until the first call to its Handle method
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// or to one of its lazyProc's Addr method.
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type lazySO struct {
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mu sync.Mutex
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so *so // non nil once SO is loaded
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Name string
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}
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// Load loads single shared file d.Name into memory. It returns an error if
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// fails. Load will not try to load SO, if it is already loaded into memory.
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func (d *lazySO) Load() error {
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// Non-racy version of:
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// if d.so == nil {
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if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&d.so))) == nil {
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d.mu.Lock()
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defer d.mu.Unlock()
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if d.so == nil {
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so, e := loadSO(d.Name)
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if e != nil {
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return e
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}
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// Non-racy version of:
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// d.so = so
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atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.so)), unsafe.Pointer(so))
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}
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}
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return nil
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}
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// mustLoad is like Load but panics if search fails.
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func (d *lazySO) mustLoad() {
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e := d.Load()
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if e != nil {
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panic(e)
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}
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}
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// Handle returns d's module handle.
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func (d *lazySO) Handle() uintptr {
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d.mustLoad()
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return uintptr(d.so.Handle)
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}
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// NewProc returns a lazyProc for accessing the named procedure in the SO d.
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func (d *lazySO) NewProc(name string) *lazyProc {
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return &lazyProc{l: d, Name: name}
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}
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// newLazySO creates new lazySO associated with SO file.
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func newLazySO(name string) *lazySO {
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return &lazySO{Name: name}
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}
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// A lazyProc implements access to a procedure inside a lazySO.
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// It delays the lookup until the Addr method is called.
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type lazyProc struct {
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mu sync.Mutex
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Name string
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l *lazySO
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proc *proc
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}
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// Find searches the shared library for procedure named p.Name. It returns an
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// error if search fails. Find will not search procedure, if it is already
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// found and loaded into memory.
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func (p *lazyProc) Find() error {
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// Non-racy version of:
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// if p.proc == nil {
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if atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc))) == nil {
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p.mu.Lock()
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defer p.mu.Unlock()
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if p.proc == nil {
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e := p.l.Load()
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if e != nil {
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return e
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}
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proc, e := p.l.so.FindProc(p.Name)
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if e != nil {
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return e
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}
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// Non-racy version of:
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// p.proc = proc
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atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&p.proc)), unsafe.Pointer(proc))
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}
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}
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return nil
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}
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// mustFind is like Find but panics if search fails.
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func (p *lazyProc) mustFind() {
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e := p.Find()
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if e != nil {
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panic(e)
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}
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}
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// Addr returns the address of the procedure represented by p.
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// The return value can be passed to Syscall to run the procedure.
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func (p *lazyProc) Addr() uintptr {
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p.mustFind()
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return p.proc.Addr()
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}
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// Call executes procedure p with arguments a. It will panic, if more then
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// 6 arguments are supplied.
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//
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// The returned error is always non-nil, constructed from the result of
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// GetLastError. Callers must inspect the primary return value to decide
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// whether an error occurred (according to the semantics of the specific
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// function being called) before consulting the error. The error will be
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// guaranteed to contain syscall.Errno.
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func (p *lazyProc) Call(a ...uintptr) (r1, r2 uintptr, lastErr error) {
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p.mustFind()
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return p.proc.Call(a...)
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}
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