| // 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 |
| */ |
| |
| //sys getgroups(ngid int, gid *_Gid_t) (n int, errno int) |
| //sys 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]) |
| } |
| |
| // 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 |
| } |
| |
| //sys pipe() (r int, w int, errno int) |
| |
| func Pipe(p []int) (errno int) { |
| if len(p) != 2 { |
| return EINVAL |
| } |
| p[0], p[1], errno = pipe() |
| 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) |
| //sys socket(domain int, typ int, proto int) (fd int, errno int) |
| //sys setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int) |
| //sys getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int) |
| //sys 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 |
| 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) |
| 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 anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) { |
| switch rsa.Addr.Family { |
| 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]) |
| 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 |
| } |
| |
| //sys 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 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 SetsockoptString(fd, level, opt int, s string) (errno int) { |
| return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&[]byte(s)[0])), 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) |
| } |
| |
| // 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 CTL_MAXNAME = 12 |
| const siz = uintptr(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) |
| |
| func Recvmsg(fd int, p, oob []byte, from Sockaddr, flags int) (n, oobn int, recvflags int, errno int) { |
| return 0, 0, 0, EAFNOSUPPORT |
| } |
| |
| func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) { |
| return EAFNOSUPPORT |
| } |
| |
| // TODO: wrap |
| // Acct(name nil-string) (errno int) |
| // Gethostuuid(uuid *byte, timeout *Timespec) (errno int) |
| // Getsockopt(s int, level int, name int, val *byte, vallen *int) (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) |
| // Munmap(addr *byte, len int) (errno int) |
| // Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, errno int) |