Editando: syscall_bsd.go
// 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. //go: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" ) const ImplementsGetwd = true func Getwd() (string, error) { var buf [pathMax]byte _, err := getcwd(buf[:]) if err != nil { return "", err } n := clen(buf[:]) if n < 1 { return "", EINVAL } return string(buf[:n]), nil } /* * 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) sa.raw.Addr = sa.Addr 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 sa.raw.Addr = sa.Addr 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 sa.raw.Data = sa.Data 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 sa.Data = pp.Data 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 } } sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n)) 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]) sa.Addr = pp.Addr 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 sa.Addr = pp.Addr 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" || runtime.GOOS == "ios") && 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 recvmsgRaw(fd int, p, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn int, recvflags int, err error) { var msg Msghdr msg.Name = (*byte)(unsafe.Pointer(rsa)) msg.Namelen = uint32(SizeofSockaddrAny) var iov Iovec if len(p) > 0 { iov.Base = &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 = &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) return } //sys sendmsg(s int, msg *Msghdr, flags int) (n int, err error) func sendmsgN(fd int, p, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags int) (n int, err error) { var msg Msghdr msg.Name = (*byte)(ptr) msg.Namelen = uint32(salen) var iov Iovec if len(p) > 0 { iov.Base = &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 = &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 } 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) //sys fcntlPtr(fd int, cmd int, arg unsafe.Pointer) (val int, err error) = SYS_FCNTL //sysnb ioctl(fd int, req int, arg int) (err error) //sysnb ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL 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) }
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