// Copyright 2018 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.
//go:build js && wasm
package syscall
import (
errorspkg "errors"
"internal/itoa"
"internal/oserror"
"sync"
"unsafe"
)
const direntSize = 8 + 8 + 2 + 256
type Dirent struct {
Reclen uint16
Name [256]byte
}
func direntIno(buf []byte) (uint64, bool) {
return 1, true
}
func direntReclen(buf []byte) (uint64, bool) {
return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
}
func direntNamlen(buf []byte) (uint64, bool) {
reclen, ok := direntReclen(buf)
if !ok {
return 0, false
}
return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
}
const PathMax = 256
// An Errno is an unsigned number describing an error condition.
// It implements the error interface. The zero Errno is by convention
// a non-error, so code to convert from Errno to error should use:
//
// err = nil
// if errno != 0 {
// err = errno
// }
//
// Errno values can be tested against error values using [errors.Is].
// For example:
//
// _, _, err := syscall.Syscall(...)
// if errors.Is(err, fs.ErrNotExist) ...
type Errno uintptr
func (e Errno) Error() string {
if 0 <= int(e) && int(e) < len(errorstr) {
s := errorstr[e]
if s != "" {
return s
}
}
return "errno " + itoa.Itoa(int(e))
}
func (e Errno) Is(target error) bool {
switch target {
case oserror.ErrPermission:
return e == EACCES || e == EPERM
case oserror.ErrExist:
return e == EEXIST || e == ENOTEMPTY
case oserror.ErrNotExist:
return e == ENOENT
case errorspkg.ErrUnsupported:
return e == ENOSYS || e == ENOTSUP || e == EOPNOTSUPP
}
return false
}
func (e Errno) Temporary() bool {
return e == EINTR || e == EMFILE || e.Timeout()
}
func (e Errno) Timeout() bool {
return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
}
// A Signal is a number describing a process signal.
// It implements the [os.Signal] interface.
type Signal int
const (
_ Signal = iota
SIGCHLD
SIGINT
SIGKILL
SIGTRAP
SIGQUIT
SIGTERM
)
func (s Signal) Signal() {}
func (s Signal) String() string {
if 0 <= s && int(s) < len(signals) {
str := signals[s]
if str != "" {
return str
}
}
return "signal " + itoa.Itoa(int(s))
}
var signals = [...]string{}
// File system
const (
Stdin = 0
Stdout = 1
Stderr = 2
)
const (
O_RDONLY = 0
O_WRONLY = 1
O_RDWR = 2
O_CREAT = 0100
O_CREATE = O_CREAT
O_TRUNC = 01000
O_APPEND = 02000
O_EXCL = 0200
O_SYNC = 010000
O_DIRECTORY = 020000
O_CLOEXEC = 0
)
const (
F_DUPFD = 0
F_GETFD = 1
F_SETFD = 2
F_GETFL = 3
F_SETFL = 4
F_GETOWN = 5
F_SETOWN = 6
F_GETLK = 7
F_SETLK = 8
F_SETLKW = 9
F_RGETLK = 10
F_RSETLK = 11
F_CNVT = 12
F_RSETLKW = 13
F_RDLCK = 1
F_WRLCK = 2
F_UNLCK = 3
F_UNLKSYS = 4
)
const (
S_IFMT = 0000370000
S_IFSHM_SYSV = 0000300000
S_IFSEMA = 0000270000
S_IFCOND = 0000260000
S_IFMUTEX = 0000250000
S_IFSHM = 0000240000
S_IFBOUNDSOCK = 0000230000
S_IFSOCKADDR = 0000220000
S_IFDSOCK = 0000210000
S_IFSOCK = 0000140000
S_IFLNK = 0000120000
S_IFREG = 0000100000
S_IFBLK = 0000060000
S_IFDIR = 0000040000
S_IFCHR = 0000020000
S_IFIFO = 0000010000
S_UNSUP = 0000370000
S_ISUID = 0004000
S_ISGID = 0002000
S_ISVTX = 0001000
S_IREAD = 0400
S_IWRITE = 0200
S_IEXEC = 0100
S_IRWXU = 0700
S_IRUSR = 0400
S_IWUSR = 0200
S_IXUSR = 0100
S_IRWXG = 070
S_IRGRP = 040
S_IWGRP = 020
S_IXGRP = 010
S_IRWXO = 07
S_IROTH = 04
S_IWOTH = 02
S_IXOTH = 01
)
type Stat_t struct {
Dev int64
Ino uint64
Mode uint32
Nlink uint32
Uid uint32
Gid uint32
Rdev int64
Size int64
Blksize int32
Blocks int32
Atime int64
AtimeNsec int64
Mtime int64
MtimeNsec int64
Ctime int64
CtimeNsec int64
}
// Processes
// Not supported - just enough for package os.
var ForkLock sync.RWMutex
type WaitStatus uint32
func (w WaitStatus) Exited() bool { return false }
func (w WaitStatus) ExitStatus() int { return 0 }
func (w WaitStatus) Signaled() bool { return false }
func (w WaitStatus) Signal() Signal { return 0 }
func (w WaitStatus) CoreDump() bool { return false }
func (w WaitStatus) Stopped() bool { return false }
func (w WaitStatus) Continued() bool { return false }
func (w WaitStatus) StopSignal() Signal { return 0 }
func (w WaitStatus) TrapCause() int { return 0 }
// XXX made up
type Rusage struct {
Utime Timeval
Stime Timeval
}
// XXX made up
type ProcAttr struct {
Dir string
Env []string
Files []uintptr
Sys *SysProcAttr
}
type SysProcAttr struct {
}
func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
return 0, 0, ENOSYS
}
func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
return 0, 0, ENOSYS
}
func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
return 0, 0, ENOSYS
}
func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
return 0, 0, ENOSYS
}
func Sysctl(key string) (string, error) {
if key == "kern.hostname" {
return "js", nil
}
return "", ENOSYS
}
const ImplementsGetwd = true
func Getwd() (wd string, err error) {
var buf [PathMax]byte
n, err := Getcwd(buf[0:])
if err != nil {
return "", err
}
return string(buf[:n]), nil
}
func Getuid() int {
return jsProcess.Call("getuid").Int()
}
func Getgid() int {
return jsProcess.Call("getgid").Int()
}
func Geteuid() int {
return jsProcess.Call("geteuid").Int()
}
func Getegid() int {
return jsProcess.Call("getegid").Int()
}
func Getgroups() (groups []int, err error) {
defer recoverErr(&err)
array := jsProcess.Call("getgroups")
groups = make([]int, array.Length())
for i := range groups {
groups[i] = array.Index(i).Int()
}
return groups, nil
}
func Getpid() int {
return jsProcess.Get("pid").Int()
}
func Getppid() int {
return jsProcess.Get("ppid").Int()
}
func Umask(mask int) (oldmask int) {
return jsProcess.Call("umask", mask).Int()
}
func Gettimeofday(tv *Timeval) error { return ENOSYS }
func Kill(pid int, signum Signal) error { return ENOSYS }
func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
return 0, ENOSYS
}
func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
return 0, 0, ENOSYS
}
func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
return 0, ENOSYS
}
type Iovec struct{} // dummy
type Timespec struct {
Sec int64
Nsec int64
}
type Timeval struct {
Sec int64
Usec int64
}
func setTimespec(sec, nsec int64) Timespec {
return Timespec{Sec: sec, Nsec: nsec}
}
func setTimeval(sec, usec int64) Timeval {
return Timeval{Sec: sec, Usec: usec}
}
