// Copyright 2009,2010 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. // Darwin system calls. // This file is compiled as ordinary Go code, // but it is also input to mksyscall, // which parses the //sys lines and generates system call stubs. // Note that sometimes we use a lowercase //sys name and wrap // it in our own nicer implementation, either here or in // syscall_bsd.go or syscall_unix.go. package unix import ( "fmt" "syscall" "unsafe" ) //sys closedir(dir uintptr) (err error) //sys readdir_r(dir uintptr, entry *Dirent, result **Dirent) (res Errno) func fdopendir(fd int) (dir uintptr, err error) { r0, _, e1 := syscall_syscallPtr(libc_fdopendir_trampoline_addr, uintptr(fd), 0, 0) dir = uintptr(r0) if e1 != 0 { err = errnoErr(e1) } return } var libc_fdopendir_trampoline_addr uintptr //go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib" func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) { // Simulate Getdirentries using fdopendir/readdir_r/closedir. // We store the number of entries to skip in the seek // offset of fd. See issue #31368. // It's not the full required semantics, but should handle the case // of calling Getdirentries or ReadDirent repeatedly. // It won't handle assigning the results of lseek to *basep, or handle // the directory being edited underfoot. skip, err := Seek(fd, 0, 1 /* SEEK_CUR */) if err != nil { return 0, err } // We need to duplicate the incoming file descriptor // because the caller expects to retain control of it, but // fdopendir expects to take control of its argument. // Just Dup'ing the file descriptor is not enough, as the // result shares underlying state. Use Openat to make a really // new file descriptor referring to the same directory. fd2, err := Openat(fd, ".", O_RDONLY, 0) if err != nil { return 0, err } d, err := fdopendir(fd2) if err != nil { Close(fd2) return 0, err } defer closedir(d) var cnt int64 for { var entry Dirent var entryp *Dirent e := readdir_r(d, &entry, &entryp) if e != 0 { return n, errnoErr(e) } if entryp == nil { break } if skip > 0 { skip-- cnt++ continue } reclen := int(entry.Reclen) if reclen > len(buf) { // Not enough room. Return for now. // The counter will let us know where we should start up again. // Note: this strategy for suspending in the middle and // restarting is O(n^2) in the length of the directory. Oh well. break } // Copy entry into return buffer. s := unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen) copy(buf, s) buf = buf[reclen:] n += reclen cnt++ } // Set the seek offset of the input fd to record // how many files we've already returned. _, err = Seek(fd, cnt, 0 /* SEEK_SET */) if err != nil { return n, err } return n, nil } // SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets. type SockaddrDatalink struct { Len uint8 Family uint8 Index uint16 Type uint8 Nlen uint8 Alen uint8 Slen uint8 Data [12]int8 raw RawSockaddrDatalink } // SockaddrCtl implements the Sockaddr interface for AF_SYSTEM type sockets. type SockaddrCtl struct { ID uint32 Unit uint32 raw RawSockaddrCtl } func (sa *SockaddrCtl) sockaddr() (unsafe.Pointer, _Socklen, error) { sa.raw.Sc_len = SizeofSockaddrCtl sa.raw.Sc_family = AF_SYSTEM sa.raw.Ss_sysaddr = AF_SYS_CONTROL sa.raw.Sc_id = sa.ID sa.raw.Sc_unit = sa.Unit return unsafe.Pointer(&sa.raw), SizeofSockaddrCtl, nil } // SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets. // SockaddrVM provides access to Darwin VM sockets: a mechanism that enables // bidirectional communication between a hypervisor and its guest virtual // machines. type SockaddrVM struct { // CID and Port specify a context ID and port address for a VM socket. // Guests have a unique CID, and hosts may have a well-known CID of: // - VMADDR_CID_HYPERVISOR: refers to the hypervisor process. // - VMADDR_CID_LOCAL: refers to local communication (loopback). // - VMADDR_CID_HOST: refers to other processes on the host. CID uint32 Port uint32 raw RawSockaddrVM } func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { sa.raw.Len = SizeofSockaddrVM sa.raw.Family = AF_VSOCK sa.raw.Port = sa.Port sa.raw.Cid = sa.CID return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil } func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { switch rsa.Addr.Family { case AF_SYSTEM: pp := (*RawSockaddrCtl)(unsafe.Pointer(rsa)) if pp.Ss_sysaddr == AF_SYS_CONTROL { sa := new(SockaddrCtl) sa.ID = pp.Sc_id sa.Unit = pp.Sc_unit return sa, nil } case AF_VSOCK: pp := (*RawSockaddrVM)(unsafe.Pointer(rsa)) sa := &SockaddrVM{ CID: pp.Cid, Port: pp.Port, } return sa, nil } return nil, EAFNOSUPPORT } // Some external packages rely on SYS___SYSCTL being defined to implement their // own sysctl wrappers. Provide it here, even though direct syscalls are no // longer supported on darwin. const SYS___SYSCTL = SYS_SYSCTL // Translate "kern.hostname" to []_C_int{0,1,2,3}. func nametomib(name string) (mib []_C_int, err error) { 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, err := ByteSliceFromString(name) if err != nil { return nil, err } // Magic sysctl: "setting" 0.3 to a string name // lets you read back the array of integers form. if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { return nil, err } return buf[0 : n/siz], nil } func direntIno(buf []byte) (uint64, bool) { return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) } func direntReclen(buf []byte) (uint64, bool) { return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) } func direntNamlen(buf []byte) (uint64, bool) { return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) } func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } func PtraceDenyAttach() (err error) { return ptrace(PT_DENY_ATTACH, 0, 0, 0) } //sysnb pipe(p *[2]int32) (err error) func Pipe(p []int) (err error) { if len(p) != 2 { return EINVAL } var x [2]int32 err = pipe(&x) if err == nil { p[0] = int(x[0]) p[1] = int(x[1]) } return } func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { var _p0 unsafe.Pointer var bufsize uintptr if len(buf) > 0 { _p0 = unsafe.Pointer(&buf[0]) bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) } return getfsstat(_p0, bufsize, flags) } func xattrPointer(dest []byte) *byte { // It's only when dest is set to NULL that the OS X implementations of // getxattr() and listxattr() return the current sizes of the named attributes. // An empty byte array is not sufficient. To maintain the same behaviour as the // linux implementation, we wrap around the system calls and pass in NULL when // dest is empty. var destp *byte if len(dest) > 0 { destp = &dest[0] } return destp } //sys getxattr(path string, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) func Getxattr(path string, attr string, dest []byte) (sz int, err error) { return getxattr(path, attr, xattrPointer(dest), len(dest), 0, 0) } func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) { return getxattr(link, attr, xattrPointer(dest), len(dest), 0, XATTR_NOFOLLOW) } //sys fgetxattr(fd int, attr string, dest *byte, size int, position uint32, options int) (sz int, err error) func Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) { return fgetxattr(fd, attr, xattrPointer(dest), len(dest), 0, 0) } //sys setxattr(path string, attr string, data *byte, size int, position uint32, options int) (err error) func Setxattr(path string, attr string, data []byte, flags int) (err error) { // The parameters for the OS X implementation vary slightly compared to the // linux system call, specifically the position parameter: // // linux: // int setxattr( // const char *path, // const char *name, // const void *value, // size_t size, // int flags // ); // // darwin: // int setxattr( // const char *path, // const char *name, // void *value, // size_t size, // u_int32_t position, // int options // ); // // position specifies the offset within the extended attribute. In the // current implementation, only the resource fork extended attribute makes // use of this argument. For all others, position is reserved. We simply // default to setting it to zero. return setxattr(path, attr, xattrPointer(data), len(data), 0, flags) } func Lsetxattr(link string, attr string, data []byte, flags int) (err error) { return setxattr(link, attr, xattrPointer(data), len(data), 0, flags|XATTR_NOFOLLOW) } //sys fsetxattr(fd int, attr string, data *byte, size int, position uint32, options int) (err error) func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) { return fsetxattr(fd, attr, xattrPointer(data), len(data), 0, 0) } //sys removexattr(path string, attr string, options int) (err error) func Removexattr(path string, attr string) (err error) { // We wrap around and explicitly zero out the options provided to the OS X // implementation of removexattr, we do so for interoperability with the // linux variant. return removexattr(path, attr, 0) } func Lremovexattr(link string, attr string) (err error) { return removexattr(link, attr, XATTR_NOFOLLOW) } //sys fremovexattr(fd int, attr string, options int) (err error) func Fremovexattr(fd int, attr string) (err error) { return fremovexattr(fd, attr, 0) } //sys listxattr(path string, dest *byte, size int, options int) (sz int, err error) func Listxattr(path string, dest []byte) (sz int, err error) { return listxattr(path, xattrPointer(dest), len(dest), 0) } func Llistxattr(link string, dest []byte) (sz int, err error) { return listxattr(link, xattrPointer(dest), len(dest), XATTR_NOFOLLOW) } //sys flistxattr(fd int, dest *byte, size int, options int) (sz int, err error) func Flistxattr(fd int, dest []byte) (sz int, err error) { return flistxattr(fd, xattrPointer(dest), len(dest), 0) } //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) /* * Wrapped */ //sys fcntl(fd int, cmd int, arg int) (val int, err error) //sys kill(pid int, signum int, posix int) (err error) func Kill(pid int, signum syscall.Signal) (err error) { return kill(pid, int(signum), 1) } //sys ioctl(fd int, req uint, arg uintptr) (err error) //sys ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL func IoctlCtlInfo(fd int, ctlInfo *CtlInfo) error { return ioctlPtr(fd, CTLIOCGINFO, unsafe.Pointer(ctlInfo)) } // IfreqMTU is struct ifreq used to get or set a network device's MTU. type IfreqMTU struct { Name [IFNAMSIZ]byte MTU int32 } // IoctlGetIfreqMTU performs the SIOCGIFMTU ioctl operation on fd to get the MTU // of the network device specified by ifname. func IoctlGetIfreqMTU(fd int, ifname string) (*IfreqMTU, error) { var ifreq IfreqMTU copy(ifreq.Name[:], ifname) err := ioctlPtr(fd, SIOCGIFMTU, unsafe.Pointer(&ifreq)) return &ifreq, err } // IoctlSetIfreqMTU performs the SIOCSIFMTU ioctl operation on fd to set the MTU // of the network device specified by ifreq.Name. func IoctlSetIfreqMTU(fd int, ifreq *IfreqMTU) error { return ioctlPtr(fd, SIOCSIFMTU, unsafe.Pointer(ifreq)) } //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS_SYSCTL func Uname(uname *Utsname) error { mib := []_C_int{CTL_KERN, KERN_OSTYPE} n := unsafe.Sizeof(uname.Sysname) if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil { return err } mib = []_C_int{CTL_KERN, KERN_HOSTNAME} n = unsafe.Sizeof(uname.Nodename) if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil { return err } mib = []_C_int{CTL_KERN, KERN_OSRELEASE} n = unsafe.Sizeof(uname.Release) if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil { return err } mib = []_C_int{CTL_KERN, KERN_VERSION} n = unsafe.Sizeof(uname.Version) if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil { return err } // The version might have newlines or tabs in it, convert them to // spaces. for i, b := range uname.Version { if b == '\n' || b == '\t' { if i == len(uname.Version)-1 { uname.Version[i] = 0 } else { uname.Version[i] = ' ' } } } mib = []_C_int{CTL_HW, HW_MACHINE} n = unsafe.Sizeof(uname.Machine) if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil { return err } return nil } func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) { if raceenabled { raceReleaseMerge(unsafe.Pointer(&ioSync)) } var length = int64(count) err = sendfile(infd, outfd, *offset, &length, nil, 0) written = int(length) return } func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { var value IPMreqn vallen := _Socklen(SizeofIPMreqn) errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, errno } func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) } // GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct. // The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively. func GetsockoptXucred(fd, level, opt int) (*Xucred, error) { x := new(Xucred) vallen := _Socklen(SizeofXucred) err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen) return x, err } func GetsockoptTCPConnectionInfo(fd, level, opt int) (*TCPConnectionInfo, error) { var value TCPConnectionInfo vallen := _Socklen(SizeofTCPConnectionInfo) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func SysctlKinfoProc(name string, args ...int) (*KinfoProc, error) { mib, err := sysctlmib(name, args...) if err != nil { return nil, err } var kinfo KinfoProc n := uintptr(SizeofKinfoProc) if err := sysctl(mib, (*byte)(unsafe.Pointer(&kinfo)), &n, nil, 0); err != nil { return nil, err } if n != SizeofKinfoProc { return nil, EIO } return &kinfo, nil } func SysctlKinfoProcSlice(name string, args ...int) ([]KinfoProc, error) { mib, err := sysctlmib(name, args...) if err != nil { return nil, err } for { // Find size. n := uintptr(0) if err := sysctl(mib, nil, &n, nil, 0); err != nil { return nil, err } if n == 0 { return nil, nil } if n%SizeofKinfoProc != 0 { return nil, fmt.Errorf("sysctl() returned a size of %d, which is not a multiple of %d", n, SizeofKinfoProc) } // Read into buffer of that size. buf := make([]KinfoProc, n/SizeofKinfoProc) if err := sysctl(mib, (*byte)(unsafe.Pointer(&buf[0])), &n, nil, 0); err != nil { if err == ENOMEM { // Process table grew. Try again. continue } return nil, err } if n%SizeofKinfoProc != 0 { return nil, fmt.Errorf("sysctl() returned a size of %d, which is not a multiple of %d", n, SizeofKinfoProc) } // The actual call may return less than the original reported required // size so ensure we deal with that. return buf[:n/SizeofKinfoProc], nil } } //sys sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error) //sys shmat(id int, addr uintptr, flag int) (ret uintptr, err error) //sys shmctl(id int, cmd int, buf *SysvShmDesc) (result int, err error) //sys shmdt(addr uintptr) (err error) //sys shmget(key int, size int, flag int) (id int, err error) /* * Exposed directly */ //sys Access(path string, mode uint32) (err error) //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) //sys Chdir(path string) (err error) //sys Chflags(path string, flags int) (err error) //sys Chmod(path string, mode uint32) (err error) //sys Chown(path string, uid int, gid int) (err error) //sys Chroot(path string) (err error) //sys ClockGettime(clockid int32, time *Timespec) (err error) //sys Close(fd int) (err error) //sys Clonefile(src string, dst string, flags int) (err error) //sys Clonefileat(srcDirfd int, src string, dstDirfd int, dst string, flags int) (err error) //sys Dup(fd int) (nfd int, err error) //sys Dup2(from int, to int) (err error) //sys Exchangedata(path1 string, path2 string, options int) (err error) //sys Exit(code int) //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error) //sys Fchdir(fd int) (err error) //sys Fchflags(fd int, flags int) (err error) //sys Fchmod(fd int, mode uint32) (err error) //sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) //sys Fchown(fd int, uid int, gid int) (err error) //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) //sys Fclonefileat(srcDirfd int, dstDirfd int, dst string, flags int) (err error) //sys Flock(fd int, how int) (err error) //sys Fpathconf(fd int, name int) (val int, err error) //sys Fsync(fd int) (err error) //sys Ftruncate(fd int, length int64) (err error) //sys Getcwd(buf []byte) (n int, err error) //sys Getdtablesize() (size int) //sysnb Getegid() (egid int) //sysnb Geteuid() (uid int) //sysnb Getgid() (gid int) //sysnb Getpgid(pid int) (pgid int, err error) //sysnb Getpgrp() (pgrp int) //sysnb Getpid() (pid int) //sysnb Getppid() (ppid int) //sys Getpriority(which int, who int) (prio int, err error) //sysnb Getrlimit(which int, lim *Rlimit) (err error) //sysnb Getrusage(who int, rusage *Rusage) (err error) //sysnb Getsid(pid int) (sid int, err error) //sysnb Gettimeofday(tp *Timeval) (err error) //sysnb Getuid() (uid int) //sysnb Issetugid() (tainted bool) //sys Kqueue() (fd int, err error) //sys Lchown(path string, uid int, gid int) (err error) //sys Link(path string, link string) (err error) //sys Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error) //sys Listen(s int, backlog int) (err error) //sys Mkdir(path string, mode uint32) (err error) //sys Mkdirat(dirfd int, path string, mode uint32) (err error) //sys Mkfifo(path string, mode uint32) (err error) //sys Mknod(path string, mode uint32, dev int) (err error) //sys Mount(fsType string, dir string, flags int, data unsafe.Pointer) (err error) //sys Open(path string, mode int, perm uint32) (fd int, err error) //sys Openat(dirfd int, path string, mode int, perm uint32) (fd int, err error) //sys Pathconf(path string, name int) (val int, err error) //sys pread(fd int, p []byte, offset int64) (n int, err error) //sys pwrite(fd int, p []byte, offset int64) (n int, err error) //sys read(fd int, p []byte) (n int, err error) //sys Readlink(path string, buf []byte) (n int, err error) //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) //sys Rename(from string, to string) (err error) //sys Renameat(fromfd int, from string, tofd int, to string) (err error) //sys Revoke(path string) (err error) //sys Rmdir(path string) (err error) //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) //sys Setattrlist(path string, attrlist *Attrlist, attrBuf []byte, options int) (err error) //sys Setegid(egid int) (err error) //sysnb Seteuid(euid int) (err error) //sysnb Setgid(gid int) (err error) //sys Setlogin(name string) (err error) //sysnb Setpgid(pid int, pgid int) (err error) //sys Setpriority(which int, who int, prio int) (err error) //sys Setprivexec(flag int) (err error) //sysnb Setregid(rgid int, egid int) (err error) //sysnb Setreuid(ruid int, euid int) (err error) //sysnb Setsid() (pid int, err error) //sysnb Settimeofday(tp *Timeval) (err error) //sysnb Setuid(uid int) (err error) //sys Symlink(path string, link string) (err error) //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) //sys Sync() (err error) //sys Truncate(path string, length int64) (err error) //sys Umask(newmask int) (oldmask int) //sys Undelete(path string) (err error) //sys Unlink(path string) (err error) //sys Unlinkat(dirfd int, path string, flags int) (err error) //sys Unmount(path string, flags int) (err error) //sys write(fd int, p []byte) (n int, err error) //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) //sys munmap(addr uintptr, length uintptr) (err error)