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// 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.
// BSD system call wrappers shared by *BSD based systems
// including OS X (Darwin) and FreeBSD. Like the other
// syscall_*.go files it is compiled as Go code but also
// used as input to mksyscall which parses the //sys
// lines and generates system call stubs.
package syscall
import "unsafe"
/*
* Pseudo-system calls
*/
// The const provides a compile-time constant so clients
// can adjust to whether there is a working Getwd and avoid
// even linking this function into the binary. See ../os/getwd.go.
const ImplementsGetwd = false
func Getwd() (string, int) { return "", ENOTSUP }
/*
* Wrapped
*/
//sysnb getgroups(ngid int, gid *_Gid_t) (n int, errno int)
//sysnb setgroups(ngid int, gid *_Gid_t) (errno int)
func Getgroups() (gids []int, errno int) {
n, err := getgroups(0, nil)
if err != 0 {
return nil, errno
}
if n == 0 {
return nil, 0
}
// Sanity check group count. Max is 16 on BSD.
if n < 0 || n > 1000 {
return nil, EINVAL
}
a := make([]_Gid_t, n)
n, err = getgroups(n, &a[0])
if err != 0 {
return nil, errno
}
gids = make([]int, n)
for i, v := range a[0:n] {
gids[i] = int(v)
}
return
}
func Setgroups(gids []int) (errno int) {
if len(gids) == 0 {
return setgroups(0, nil)
}
a := make([]_Gid_t, len(gids))
for i, v := range gids {
a[i] = _Gid_t(v)
}
return setgroups(len(a), &a[0])
}
func ReadDirent(fd int, buf []byte) (n int, errno int) {
// Final argument is (basep *uintptr) and the syscall doesn't take nil.
// TODO(rsc): Can we use a single global basep for all calls?
return Getdirentries(fd, buf, new(uintptr))
}
// Wait status is 7 bits at bottom, either 0 (exited),
// 0x7F (stopped), or a signal number that caused an exit.
// The 0x80 bit is whether there was a core dump.
// An extra number (exit code, signal causing a stop)
// is in the high bits.
type WaitStatus uint32
const (
mask = 0x7F
core = 0x80
shift = 8
exited = 0
stopped = 0x7F
)
func (w WaitStatus) Exited() bool { return w&mask == exited }
func (w WaitStatus) ExitStatus() int {
if w&mask != exited {
return -1
}
return int(w >> shift)
}
func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != 0 }
func (w WaitStatus) Signal() int {
sig := int(w & mask)
if sig == stopped || sig == 0 {
return -1
}
return sig
}
func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
func (w WaitStatus) Stopped() bool { return w&mask == stopped && w>>shift != SIGSTOP }
func (w WaitStatus) Continued() bool { return w&mask == stopped && w>>shift == SIGSTOP }
func (w WaitStatus) StopSignal() int {
if !w.Stopped() {
return -1
}
return int(w>>shift) & 0xFF
}
func (w WaitStatus) TrapCause() int { return -1 }
//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, errno int)
func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, errno int) {
var status _C_int
wpid, errno = wait4(pid, &status, options, rusage)
if wstatus != nil {
*wstatus = WaitStatus(status)
}
return
}
func Sleep(ns int64) (errno int) {
tv := NsecToTimeval(ns)
return Select(0, nil, nil, nil, &tv)
}
//sys accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, errno int)
//sys bind(s int, addr uintptr, addrlen _Socklen) (errno int)
//sys connect(s int, addr uintptr, addrlen _Socklen) (errno int)
//sysnb socket(domain int, typ int, proto int) (fd int, errno int)
//sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (errno int)
//sys setsockopt(s int, level int, name int, val uintptr, vallen uintptr) (errno int)
//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
//sys Shutdown(s int, how int) (errno int)
// For testing: clients can set this flag to force
// creation of IPv6 sockets to return EAFNOSUPPORT.
var SocketDisableIPv6 bool
type Sockaddr interface {
sockaddr() (ptr uintptr, len _Socklen, errno int) // lowercase; only we can define Sockaddrs
}
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
func (sa *SockaddrInet4) sockaddr() (uintptr, _Socklen, int) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return 0, 0, EINVAL
}
sa.raw.Len = SizeofSockaddrInet4
sa.raw.Family = AF_INET
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return uintptr(unsafe.Pointer(&sa.raw)), _Socklen(sa.raw.Len), 0
}
type SockaddrInet6 struct {
Port int
ZoneId uint32
Addr [16]byte
raw RawSockaddrInet6
}
func (sa *SockaddrInet6) sockaddr() (uintptr, _Socklen, int) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return 0, 0, EINVAL
}
sa.raw.Len = SizeofSockaddrInet6
sa.raw.Family = AF_INET6
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
sa.raw.Scope_id = sa.ZoneId
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return uintptr(unsafe.Pointer(&sa.raw)), _Socklen(sa.raw.Len), 0
}
type SockaddrUnix struct {
Name string
raw RawSockaddrUnix
}
func (sa *SockaddrUnix) sockaddr() (uintptr, _Socklen, int) {
name := sa.Name
n := len(name)
if n >= len(sa.raw.Path) || n == 0 {
return 0, 0, EINVAL
}
sa.raw.Len = byte(3 + n) // 2 for Family, Len; 1 for NUL
sa.raw.Family = AF_UNIX
for i := 0; i < n; i++ {
sa.raw.Path[i] = int8(name[i])
}
return uintptr(unsafe.Pointer(&sa.raw)), _Socklen(sa.raw.Len), 0
}
func (sa *SockaddrDatalink) sockaddr() (uintptr, _Socklen, int) {
if sa.Index == 0 {
return 0, 0, EINVAL
}
sa.raw.Len = sa.Len
sa.raw.Family = AF_LINK
sa.raw.Index = sa.Index
sa.raw.Type = sa.Type
sa.raw.Nlen = sa.Nlen
sa.raw.Alen = sa.Alen
sa.raw.Slen = sa.Slen
for i := 0; i < len(sa.raw.Data); i++ {
sa.raw.Data[i] = sa.Data[i]
}
return uintptr(unsafe.Pointer(&sa.raw)), SizeofSockaddrDatalink, 0
}
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
switch rsa.Addr.Family {
case AF_LINK:
pp := (*RawSockaddrDatalink)(unsafe.Pointer(rsa))
sa := new(SockaddrDatalink)
sa.Len = pp.Len
sa.Family = pp.Family
sa.Index = pp.Index
sa.Type = pp.Type
sa.Nlen = pp.Nlen
sa.Alen = pp.Alen
sa.Slen = pp.Slen
for i := 0; i < len(sa.Data); i++ {
sa.Data[i] = pp.Data[i]
}
return sa, 0
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
if pp.Len < 3 || pp.Len > SizeofSockaddrUnix {
return nil, EINVAL
}
sa := new(SockaddrUnix)
n := int(pp.Len) - 3 // subtract leading Family, Len, terminating NUL
for i := 0; i < n; i++ {
if pp.Path[i] == 0 {
// found early NUL; assume Len is overestimating
n = i
break
}
}
bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
sa.Name = string(bytes)
return sa, 0
case AF_INET:
pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
sa := new(SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, 0
case AF_INET6:
pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
sa := new(SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
sa.ZoneId = pp.Scope_id
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, 0
}
return nil, EAFNOSUPPORT
}
func Accept(fd int) (nfd int, sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
nfd, errno = accept(fd, &rsa, &len)
if errno != 0 {
return
}
sa, errno = anyToSockaddr(&rsa)
if errno != 0 {
Close(nfd)
nfd = 0
}
return
}
func Getsockname(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if errno = getsockname(fd, &rsa, &len); errno != 0 {
return
}
return anyToSockaddr(&rsa)
}
func Getpeername(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if errno = getpeername(fd, &rsa, &len); errno != 0 {
return
}
return anyToSockaddr(&rsa)
}
func Bind(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr()
if err != 0 {
return err
}
return bind(fd, ptr, n)
}
func Connect(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr()
if err != 0 {
return err
}
return connect(fd, ptr, n)
}
func Socket(domain, typ, proto int) (fd, errno int) {
if domain == AF_INET6 && SocketDisableIPv6 {
return -1, EAFNOSUPPORT
}
fd, errno = socket(domain, typ, proto)
return
}
//sysnb socketpair(domain int, typ int, proto int, fd *[2]int) (errno int)
func Socketpair(domain, typ, proto int) (fd [2]int, errno int) {
errno = socketpair(domain, typ, proto, &fd)
return
}
func GetsockoptInt(fd, level, opt int) (value, errno int) {
var n int32
vallen := _Socklen(4)
errno = getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&n)), &vallen)
return int(n), errno
}
func SetsockoptInt(fd, level, opt int, value int) (errno int) {
var n = int32(value)
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&n)), 4)
}
func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(tv)), unsafe.Sizeof(*tv))
}
func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(l)), unsafe.Sizeof(*l))
}
func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(mreq)), unsafe.Sizeof(*mreq))
}
func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(mreq)), unsafe.Sizeof(*mreq))
}
func SetsockoptString(fd, level, opt int, s string) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&[]byte(s)[0])), uintptr(len(s)))
}
//sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int)
func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, errno int) {
var rsa RawSockaddrAny
var len _Socklen = SizeofSockaddrAny
if n, errno = recvfrom(fd, p, flags, &rsa, &len); errno != 0 {
return
}
from, errno = anyToSockaddr(&rsa)
return
}
//sys sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int)
func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
ptr, n, err := to.sockaddr()
if err != 0 {
return err
}
return sendto(fd, p, flags, ptr, n)
}
//sys recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, errno int) {
var msg Msghdr
var rsa RawSockaddrAny
msg.Name = (*byte)(unsafe.Pointer(&rsa))
msg.Namelen = uint32(SizeofSockaddrAny)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// receive at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if n, errno = recvmsg(fd, &msg, flags); errno != 0 {
return
}
oobn = int(msg.Controllen)
recvflags = int(msg.Flags)
// source address is only specified if the socket is unconnected
if rsa.Addr.Family != AF_UNSPEC {
from, errno = anyToSockaddr(&rsa)
}
return
}
//sys sendmsg(s int, msg *Msghdr, flags int) (errno int)
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) {
var ptr uintptr
var salen _Socklen
if to != nil {
var err int
ptr, salen, err = to.sockaddr()
if err != 0 {
return err
}
}
var msg Msghdr
msg.Name = (*byte)(unsafe.Pointer(ptr))
msg.Namelen = uint32(salen)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// send at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if errno = sendmsg(fd, &msg, flags); errno != 0 {
return
}
return
}
// TODO:
// FreeBSD has IP_SENDIF. Darwin probably needs BSDLLCTest, see:
// http://developer.apple.com/mac/library/samplecode/BSDLLCTest/index.html
// BindToDevice binds the socket associated with fd to device.
func BindToDevice(fd int, device string) (errno int) {
return ENOSYS
}
//sys kevent(kq int, change uintptr, nchange int, event uintptr, nevent int, timeout *Timespec) (n int, errno int)
func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, errno int) {
var change, event uintptr
if len(changes) > 0 {
change = uintptr(unsafe.Pointer(&changes[0]))
}
if len(events) > 0 {
event = uintptr(unsafe.Pointer(&events[0]))
}
return kevent(kq, change, len(changes), event, len(events), timeout)
}
//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (errno int) = SYS___SYSCTL
// Translate "kern.hostname" to []_C_int{0,1,2,3}.
func nametomib(name string) (mib []_C_int, errno int) {
const siz = unsafe.Sizeof(mib[0])
// NOTE(rsc): It seems strange to set the buffer to have
// size CTL_MAXNAME+2 but use only CTL_MAXNAME
// as the size. I don't know why the +2 is here, but the
// kernel uses +2 for its own implementation of this function.
// I am scared that if we don't include the +2 here, the kernel
// will silently write 2 words farther than we specify
// and we'll get memory corruption.
var buf [CTL_MAXNAME + 2]_C_int
n := uintptr(CTL_MAXNAME) * siz
p := (*byte)(unsafe.Pointer(&buf[0]))
bytes := StringByteSlice(name)
// Magic sysctl: "setting" 0.3 to a string name
// lets you read back the array of integers form.
if errno = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); errno != 0 {
return nil, errno
}
return buf[0 : n/siz], 0
}
func Sysctl(name string) (value string, errno int) {
// Translate name to mib number.
mib, errno := nametomib(name)
if errno != 0 {
return "", errno
}
// Find size.
n := uintptr(0)
if errno = sysctl(mib, nil, &n, nil, 0); errno != 0 {
return "", errno
}
if n == 0 {
return "", 0
}
// Read into buffer of that size.
buf := make([]byte, n)
if errno = sysctl(mib, &buf[0], &n, nil, 0); errno != 0 {
return "", errno
}
// Throw away terminating NUL.
if n > 0 && buf[n-1] == '\x00' {
n--
}
return string(buf[0:n]), 0
}
func SysctlUint32(name string) (value uint32, errno int) {
// Translate name to mib number.
mib, errno := nametomib(name)
if errno != 0 {
return 0, errno
}
// Read into buffer of that size.
n := uintptr(4)
buf := make([]byte, 4)
if errno = sysctl(mib, &buf[0], &n, nil, 0); errno != 0 {
return 0, errno
}
if n != 4 {
return 0, EIO
}
return *(*uint32)(unsafe.Pointer(&buf[0])), 0
}
//sys utimes(path string, timeval *[2]Timeval) (errno int)
func Utimes(path string, tv []Timeval) (errno int) {
if len(tv) != 2 {
return EINVAL
}
return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
}
//sys futimes(fd int, timeval *[2]Timeval) (errno int)
func Futimes(fd int, tv []Timeval) (errno int) {
if len(tv) != 2 {
return EINVAL
}
return futimes(fd, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
}
//sys fcntl(fd int, cmd int, arg int) (val int, errno int)
// TODO: wrap
// Acct(name nil-string) (errno int)
// Gethostuuid(uuid *byte, timeout *Timespec) (errno int)
// Madvise(addr *byte, len int, behav int) (errno int)
// Mprotect(addr *byte, len int, prot int) (errno int)
// Msync(addr *byte, len int, flags int) (errno int)
// Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, errno int)
var mapper = &mmapper{
active: make(map[*byte][]byte),
mmap: mmap,
munmap: munmap,
}
func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, errno int) {
return mapper.Mmap(fd, offset, length, prot, flags)
}
func Munmap(b []byte) (errno int) {
return mapper.Munmap(b)
}