| // 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. |
| |
| // +build darwin dragonfly freebsd netbsd openbsd |
| |
| // 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 ( |
| "runtime" |
| "unsafe" |
| ) |
| |
| /* |
| * Wrapped |
| */ |
| |
| //sysnb getgroups(ngid int, gid *_Gid_t) (n int, err error) |
| //sysnb setgroups(ngid int, gid *_Gid_t) (err error) |
| |
| func Getgroups() (gids []int, err error) { |
| n, err := getgroups(0, nil) |
| if err != nil { |
| return nil, err |
| } |
| if n == 0 { |
| return nil, nil |
| } |
| |
| // 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 != nil { |
| return nil, err |
| } |
| gids = make([]int, n) |
| for i, v := range a[0:n] { |
| gids[i] = int(v) |
| } |
| return |
| } |
| |
| func Setgroups(gids []int) (err error) { |
| 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, err error) { |
| // Final argument is (basep *uintptr) and the syscall doesn't take nil. |
| // 64 bits should be enough. (32 bits isn't even on 386). Since the |
| // actual system call is getdirentries64, 64 is a good guess. |
| // TODO(rsc): Can we use a single global basep for all calls? |
| var base = (*uintptr)(unsafe.Pointer(new(uint64))) |
| return Getdirentries(fd, buf, base) |
| } |
| |
| // 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() Signal { |
| sig := Signal(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 && Signal(w>>shift) != SIGSTOP } |
| |
| func (w WaitStatus) Continued() bool { return w&mask == stopped && Signal(w>>shift) == SIGSTOP } |
| |
| func (w WaitStatus) StopSignal() Signal { |
| if !w.Stopped() { |
| return -1 |
| } |
| return Signal(w>>shift) & 0xFF |
| } |
| |
| func (w WaitStatus) TrapCause() int { return -1 } |
| |
| //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) |
| |
| func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) { |
| var status _C_int |
| wpid, err = wait4(pid, &status, options, rusage) |
| if wstatus != nil { |
| *wstatus = WaitStatus(status) |
| } |
| return |
| } |
| |
| //sys accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) |
| //sys bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) |
| //sys connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) |
| //sysnb socket(domain int, typ int, proto int) (fd int, err error) |
| //sys getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) |
| //sys setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) |
| //sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) |
| //sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) |
| //sys Shutdown(s int, how int) (err error) |
| |
| func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) { |
| if sa.Port < 0 || sa.Port > 0xFFFF { |
| return nil, 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 unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil |
| } |
| |
| func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) { |
| if sa.Port < 0 || sa.Port > 0xFFFF { |
| return nil, 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 unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil |
| } |
| |
| func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { |
| name := sa.Name |
| n := len(name) |
| if n >= len(sa.raw.Path) || n == 0 { |
| return nil, 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 unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil |
| } |
| |
| func (sa *SockaddrDatalink) sockaddr() (unsafe.Pointer, _Socklen, error) { |
| if sa.Index == 0 { |
| return nil, 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 unsafe.Pointer(&sa.raw), SizeofSockaddrDatalink, nil |
| } |
| |
| func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { |
| 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, nil |
| |
| case AF_UNIX: |
| pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa)) |
| if pp.Len < 2 || pp.Len > SizeofSockaddrUnix { |
| return nil, EINVAL |
| } |
| sa := new(SockaddrUnix) |
| |
| // Some BSDs include the trailing NUL in the length, whereas |
| // others do not. Work around this by subtracting the leading |
| // family and len. The path is then scanned to see if a NUL |
| // terminator still exists within the length. |
| n := int(pp.Len) - 2 // subtract leading Family, Len |
| for i := 0; i < n; i++ { |
| if pp.Path[i] == 0 { |
| // found early NUL; assume Len included the NUL |
| // or was overestimating. |
| n = i |
| break |
| } |
| } |
| bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n] |
| sa.Name = string(bytes) |
| return sa, nil |
| |
| 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, nil |
| |
| 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, nil |
| } |
| return nil, EAFNOSUPPORT |
| } |
| |
| func Accept(fd int) (nfd int, sa Sockaddr, err error) { |
| var rsa RawSockaddrAny |
| var len _Socklen = SizeofSockaddrAny |
| nfd, err = accept(fd, &rsa, &len) |
| if err != nil { |
| return |
| } |
| if runtime.GOOS == "darwin" && len == 0 { |
| // Accepted socket has no address. |
| // This is likely due to a bug in xnu kernels, |
| // where instead of ECONNABORTED error socket |
| // is accepted, but has no address. |
| Close(nfd) |
| return 0, nil, ECONNABORTED |
| } |
| sa, err = anyToSockaddr(&rsa) |
| if err != nil { |
| Close(nfd) |
| nfd = 0 |
| } |
| return |
| } |
| |
| func Getsockname(fd int) (sa Sockaddr, err error) { |
| var rsa RawSockaddrAny |
| var len _Socklen = SizeofSockaddrAny |
| if err = getsockname(fd, &rsa, &len); err != nil { |
| return |
| } |
| // TODO(jsing): DragonFly has a "bug" (see issue 3349), which should be |
| // reported upstream. |
| if runtime.GOOS == "dragonfly" && rsa.Addr.Family == AF_UNSPEC && rsa.Addr.Len == 0 { |
| rsa.Addr.Family = AF_UNIX |
| rsa.Addr.Len = SizeofSockaddrUnix |
| } |
| return anyToSockaddr(&rsa) |
| } |
| |
| //sysnb socketpair(domain int, typ int, proto int, fd *[2]int32) (err error) |
| |
| func GetsockoptByte(fd, level, opt int) (value byte, err error) { |
| var n byte |
| vallen := _Socklen(1) |
| err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen) |
| return n, err |
| } |
| |
| func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { |
| vallen := _Socklen(4) |
| err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) |
| return value, err |
| } |
| |
| func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { |
| var value IPMreq |
| vallen := _Socklen(SizeofIPMreq) |
| err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) |
| return &value, err |
| } |
| |
| func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { |
| var value IPv6Mreq |
| vallen := _Socklen(SizeofIPv6Mreq) |
| err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) |
| return &value, err |
| } |
| |
| func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { |
| var value IPv6MTUInfo |
| vallen := _Socklen(SizeofIPv6MTUInfo) |
| err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) |
| return &value, err |
| } |
| |
| func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { |
| var value ICMPv6Filter |
| vallen := _Socklen(SizeofICMPv6Filter) |
| err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) |
| return &value, err |
| } |
| |
| //sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) |
| //sys sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) |
| //sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error) |
| |
| func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) { |
| 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, err = recvmsg(fd, &msg, flags); err != nil { |
| 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, err = anyToSockaddr(&rsa) |
| } |
| return |
| } |
| |
| //sys sendmsg(s int, msg *Msghdr, flags int) (n int, err error) |
| |
| func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) { |
| _, err = SendmsgN(fd, p, oob, to, flags) |
| return |
| } |
| |
| func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) { |
| var ptr unsafe.Pointer |
| var salen _Socklen |
| if to != nil { |
| ptr, salen, err = to.sockaddr() |
| if err != nil { |
| return 0, 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 n, err = sendmsg(fd, &msg, flags); err != nil { |
| return 0, err |
| } |
| if len(oob) > 0 && len(p) == 0 { |
| n = 0 |
| } |
| return n, nil |
| } |
| |
| //sys kevent(kq int, change unsafe.Pointer, nchange int, event unsafe.Pointer, nevent int, timeout *Timespec) (n int, err error) |
| |
| func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, err error) { |
| var change, event unsafe.Pointer |
| if len(changes) > 0 { |
| change = unsafe.Pointer(&changes[0]) |
| } |
| if len(events) > 0 { |
| event = unsafe.Pointer(&events[0]) |
| } |
| return kevent(kq, change, len(changes), event, len(events), timeout) |
| } |
| |
| func Sysctl(name string) (value string, err error) { |
| // Translate name to mib number. |
| mib, err := nametomib(name) |
| if err != nil { |
| return "", err |
| } |
| |
| // Find size. |
| n := uintptr(0) |
| if err = sysctl(mib, nil, &n, nil, 0); err != nil { |
| return "", err |
| } |
| if n == 0 { |
| return "", nil |
| } |
| |
| // Read into buffer of that size. |
| buf := make([]byte, n) |
| if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil { |
| return "", err |
| } |
| |
| // Throw away terminating NUL. |
| if n > 0 && buf[n-1] == '\x00' { |
| n-- |
| } |
| return string(buf[0:n]), nil |
| } |
| |
| func SysctlUint32(name string) (value uint32, err error) { |
| // Translate name to mib number. |
| mib, err := nametomib(name) |
| if err != nil { |
| return 0, err |
| } |
| |
| // Read into buffer of that size. |
| n := uintptr(4) |
| buf := make([]byte, 4) |
| if err = sysctl(mib, &buf[0], &n, nil, 0); err != nil { |
| return 0, err |
| } |
| if n != 4 { |
| return 0, EIO |
| } |
| return *(*uint32)(unsafe.Pointer(&buf[0])), nil |
| } |
| |
| //sys utimes(path string, timeval *[2]Timeval) (err error) |
| |
| func Utimes(path string, tv []Timeval) (err error) { |
| if len(tv) != 2 { |
| return EINVAL |
| } |
| return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) |
| } |
| |
| func UtimesNano(path string, ts []Timespec) error { |
| if len(ts) != 2 { |
| return EINVAL |
| } |
| // Darwin setattrlist can set nanosecond timestamps |
| err := setattrlistTimes(path, ts) |
| if err != ENOSYS { |
| return err |
| } |
| err = utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) |
| if err != ENOSYS { |
| return err |
| } |
| // Not as efficient as it could be because Timespec and |
| // Timeval have different types in the different OSes |
| tv := [2]Timeval{ |
| NsecToTimeval(TimespecToNsec(ts[0])), |
| NsecToTimeval(TimespecToNsec(ts[1])), |
| } |
| return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) |
| } |
| |
| //sys futimes(fd int, timeval *[2]Timeval) (err error) |
| |
| func Futimes(fd int, tv []Timeval) (err error) { |
| 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, err error) |
| |
| 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, err error) { |
| return mapper.Mmap(fd, offset, length, prot, flags) |
| } |
| |
| func Munmap(b []byte) (err error) { |
| return mapper.Munmap(b) |
| } |
