mirror of https://github.com/golang/go.git
379 lines
12 KiB
Go
379 lines
12 KiB
Go
// Copyright 2009,2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Darwin system calls.
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// This file is compiled as ordinary Go code,
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// but it is also input to mksyscall,
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// which parses the //sys lines and generates system call stubs.
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// Note that sometimes we use a lowercase //sys name and wrap
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// it in our own nicer implementation, either here or in
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// syscall_bsd.go or syscall_unix.go.
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package syscall
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import (
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errorspkg "errors"
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"unsafe"
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)
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const ImplementsGetwd = true
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func Getwd() (string, error) {
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buf := make([]byte, 2048)
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attrs, err := getAttrList(".", attrList{CommonAttr: attrCmnFullpath}, buf, 0)
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if err == nil && len(attrs) == 1 && len(attrs[0]) >= 2 {
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wd := string(attrs[0])
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// Sanity check that it's an absolute path and ends
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// in a null byte, which we then strip.
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if wd[0] == '/' && wd[len(wd)-1] == 0 {
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return wd[:len(wd)-1], nil
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}
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}
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// If pkg/os/getwd.go gets ENOTSUP, it will fall back to the
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// slow algorithm.
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return "", ENOTSUP
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}
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type SockaddrDatalink struct {
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Len uint8
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Family uint8
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Index uint16
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Type uint8
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Nlen uint8
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Alen uint8
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Slen uint8
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Data [12]int8
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raw RawSockaddrDatalink
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}
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// Translate "kern.hostname" to []_C_int{0,1,2,3}.
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func nametomib(name string) (mib []_C_int, err error) {
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const siz = unsafe.Sizeof(mib[0])
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// NOTE(rsc): It seems strange to set the buffer to have
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// size CTL_MAXNAME+2 but use only CTL_MAXNAME
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// as the size. I don't know why the +2 is here, but the
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// kernel uses +2 for its own implementation of this function.
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// I am scared that if we don't include the +2 here, the kernel
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// will silently write 2 words farther than we specify
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// and we'll get memory corruption.
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var buf [CTL_MAXNAME + 2]_C_int
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n := uintptr(CTL_MAXNAME) * siz
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p := (*byte)(unsafe.Pointer(&buf[0]))
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bytes, err := ByteSliceFromString(name)
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if err != nil {
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return nil, err
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}
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// Magic sysctl: "setting" 0.3 to a string name
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// lets you read back the array of integers form.
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if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil {
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return nil, err
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}
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return buf[0 : n/siz], nil
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}
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func direntIno(buf []byte) (uint64, bool) {
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return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
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}
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func direntReclen(buf []byte) (uint64, bool) {
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return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
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}
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func direntNamlen(buf []byte) (uint64, bool) {
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return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
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}
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//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
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func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) }
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func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) }
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const (
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attrBitMapCount = 5
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attrCmnModtime = 0x00000400
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attrCmnAcctime = 0x00001000
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attrCmnFullpath = 0x08000000
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)
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type attrList struct {
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bitmapCount uint16
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_ uint16
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CommonAttr uint32
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VolAttr uint32
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DirAttr uint32
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FileAttr uint32
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Forkattr uint32
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}
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func getAttrList(path string, attrList attrList, attrBuf []byte, options uint) (attrs [][]byte, err error) {
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if len(attrBuf) < 4 {
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return nil, errorspkg.New("attrBuf too small")
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}
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attrList.bitmapCount = attrBitMapCount
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var _p0 *byte
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_p0, err = BytePtrFromString(path)
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if err != nil {
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return nil, err
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}
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_, _, e1 := syscall6(
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funcPC(libc_getattrlist_trampoline),
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uintptr(unsafe.Pointer(_p0)),
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uintptr(unsafe.Pointer(&attrList)),
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uintptr(unsafe.Pointer(&attrBuf[0])),
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uintptr(len(attrBuf)),
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uintptr(options),
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0,
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)
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if e1 != 0 {
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return nil, e1
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}
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size := *(*uint32)(unsafe.Pointer(&attrBuf[0]))
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// dat is the section of attrBuf that contains valid data,
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// without the 4 byte length header. All attribute offsets
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// are relative to dat.
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dat := attrBuf
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if int(size) < len(attrBuf) {
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dat = dat[:size]
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}
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dat = dat[4:] // remove length prefix
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for i := uint32(0); int(i) < len(dat); {
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header := dat[i:]
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if len(header) < 8 {
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return attrs, errorspkg.New("truncated attribute header")
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}
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datOff := *(*int32)(unsafe.Pointer(&header[0]))
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attrLen := *(*uint32)(unsafe.Pointer(&header[4]))
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if datOff < 0 || uint32(datOff)+attrLen > uint32(len(dat)) {
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return attrs, errorspkg.New("truncated results; attrBuf too small")
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}
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end := uint32(datOff) + attrLen
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attrs = append(attrs, dat[datOff:end])
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i = end
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if r := i % 4; r != 0 {
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i += (4 - r)
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}
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}
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return
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}
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func libc_getattrlist_trampoline()
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//go:linkname libc_getattrlist libc_getattrlist
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//go:cgo_import_dynamic libc_getattrlist getattrlist "/usr/lib/libSystem.B.dylib"
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//sysnb pipe(p *[2]int32) (err error)
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func Pipe(p []int) (err error) {
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if len(p) != 2 {
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return EINVAL
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}
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var q [2]int32
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err = pipe(&q)
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p[0] = int(q[0])
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p[1] = int(q[1])
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return
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}
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func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
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var _p0 unsafe.Pointer
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var bufsize uintptr
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if len(buf) > 0 {
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_p0 = unsafe.Pointer(&buf[0])
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bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
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}
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r0, _, e1 := syscall(funcPC(libc_getfsstat64_trampoline), uintptr(_p0), bufsize, uintptr(flags))
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n = int(r0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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func libc_getfsstat64_trampoline()
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//go:linkname libc_getfsstat64 libc_getfsstat64
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//go:cgo_import_dynamic libc_getfsstat64 getfsstat64 "/usr/lib/libSystem.B.dylib"
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func setattrlistTimes(path string, times []Timespec) error {
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_p0, err := BytePtrFromString(path)
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if err != nil {
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return err
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}
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var attrList attrList
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attrList.bitmapCount = attrBitMapCount
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attrList.CommonAttr = attrCmnModtime | attrCmnAcctime
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// order is mtime, atime: the opposite of Chtimes
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attributes := [2]Timespec{times[1], times[0]}
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const options = 0
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_, _, e1 := syscall6(
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funcPC(libc_setattrlist_trampoline),
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uintptr(unsafe.Pointer(_p0)),
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uintptr(unsafe.Pointer(&attrList)),
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uintptr(unsafe.Pointer(&attributes)),
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uintptr(unsafe.Sizeof(attributes)),
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uintptr(options),
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0,
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)
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if e1 != 0 {
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return e1
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}
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return nil
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}
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func libc_setattrlist_trampoline()
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//go:linkname libc_setattrlist libc_setattrlist
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//go:cgo_import_dynamic libc_setattrlist setattrlist "/usr/lib/libSystem.B.dylib"
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func utimensat(dirfd int, path string, times *[2]Timespec, flag int) error {
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// Darwin doesn't support SYS_UTIMENSAT
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return ENOSYS
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}
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/*
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* Wrapped
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*/
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//sys kill(pid int, signum int, posix int) (err error)
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func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1) }
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/*
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* Exposed directly
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*/
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//sys Access(path string, mode uint32) (err error)
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//sys Adjtime(delta *Timeval, olddelta *Timeval) (err error)
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//sys Chdir(path string) (err error)
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//sys Chflags(path string, flags int) (err error)
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//sys Chmod(path string, mode uint32) (err error)
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//sys Chown(path string, uid int, gid int) (err error)
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//sys Chroot(path string) (err error)
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//sys Close(fd int) (err error)
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//sys Dup(fd int) (nfd int, err error)
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//sys Dup2(from int, to int) (err error)
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//sys Exchangedata(path1 string, path2 string, options int) (err error)
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//sys Fchdir(fd int) (err error)
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//sys Fchflags(fd int, flags int) (err error)
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//sys Fchmod(fd int, mode uint32) (err error)
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//sys Fchown(fd int, uid int, gid int) (err error)
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//sys Flock(fd int, how int) (err error)
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//sys Fpathconf(fd int, name int) (val int, err error)
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//sys Fsync(fd int) (err error)
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// Fsync is not called for os.File.Sync(). Please see internal/poll/fd_fsync_darwin.go
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//sys Ftruncate(fd int, length int64) (err error)
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//sys Getdtablesize() (size int)
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//sysnb Getegid() (egid int)
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//sysnb Geteuid() (uid int)
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//sysnb Getgid() (gid int)
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//sysnb Getpgid(pid int) (pgid int, err error)
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//sysnb Getpgrp() (pgrp int)
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//sysnb Getpid() (pid int)
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//sysnb Getppid() (ppid int)
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//sys Getpriority(which int, who int) (prio int, err error)
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//sysnb Getrlimit(which int, lim *Rlimit) (err error)
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//sysnb Getrusage(who int, rusage *Rusage) (err error)
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//sysnb Getsid(pid int) (sid int, err error)
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//sysnb Getuid() (uid int)
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//sysnb Issetugid() (tainted bool)
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//sys Kqueue() (fd int, err error)
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//sys Lchown(path string, uid int, gid int) (err error)
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//sys Link(path string, link string) (err error)
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//sys Listen(s int, backlog int) (err error)
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//sys Mkdir(path string, mode uint32) (err error)
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//sys Mkfifo(path string, mode uint32) (err error)
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//sys Mknod(path string, mode uint32, dev int) (err error)
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//sys Mlock(b []byte) (err error)
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//sys Mlockall(flags int) (err error)
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//sys Mprotect(b []byte, prot int) (err error)
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//sys Munlock(b []byte) (err error)
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//sys Munlockall() (err error)
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//sys Open(path string, mode int, perm uint32) (fd int, err error)
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//sys Pathconf(path string, name int) (val int, err error)
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//sys Pread(fd int, p []byte, offset int64) (n int, err error)
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//sys Pwrite(fd int, p []byte, offset int64) (n int, err error)
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//sys read(fd int, p []byte) (n int, err error)
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//sys Readlink(path string, buf []byte) (n int, err error)
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//sys Rename(from string, to string) (err error)
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//sys Revoke(path string) (err error)
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//sys Rmdir(path string) (err error)
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//sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_lseek
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//sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error)
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//sys Setegid(egid int) (err error)
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//sysnb Seteuid(euid int) (err error)
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//sysnb Setgid(gid int) (err error)
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//sys Setlogin(name string) (err error)
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//sysnb Setpgid(pid int, pgid int) (err error)
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//sys Setpriority(which int, who int, prio int) (err error)
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//sys Setprivexec(flag int) (err error)
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//sysnb Setregid(rgid int, egid int) (err error)
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//sysnb Setreuid(ruid int, euid int) (err error)
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//sysnb Setrlimit(which int, lim *Rlimit) (err error)
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//sysnb Setsid() (pid int, err error)
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//sysnb Settimeofday(tp *Timeval) (err error)
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//sysnb Setuid(uid int) (err error)
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//sys Symlink(path string, link string) (err error)
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//sys Sync() (err error)
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//sys Truncate(path string, length int64) (err error)
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//sys Umask(newmask int) (oldmask int)
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//sys Undelete(path string) (err error)
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//sys Unlink(path string) (err error)
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//sys Unmount(path string, flags int) (err error)
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//sys write(fd int, p []byte) (n int, err error)
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//sys writev(fd int, iovecs []Iovec) (cnt uintptr, err error)
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//sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
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//sys munmap(addr uintptr, length uintptr) (err error)
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//sysnb fork() (pid int, err error)
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//sysnb ioctl(fd int, req int, arg int) (err error)
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//sysnb ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_ioctl
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//sysnb execve(path *byte, argv **byte, envp **byte) (err error)
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//sysnb exit(res int) (err error)
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//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)
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//sys fcntlPtr(fd int, cmd int, arg unsafe.Pointer) (val int, err error) = SYS_fcntl
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//sys unlinkat(fd int, path string, flags int) (err error)
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//sys openat(fd int, path string, flags int, perm uint32) (fdret int, err error)
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func init() {
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execveDarwin = execve
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}
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func readlen(fd int, buf *byte, nbuf int) (n int, err error) {
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r0, _, e1 := syscall(funcPC(libc_read_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
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n = int(r0)
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if e1 != 0 {
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err = errnoErr(e1)
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}
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return
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}
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func writelen(fd int, buf *byte, nbuf int) (n int, err error) {
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r0, _, e1 := syscall(funcPC(libc_write_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
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n = int(r0)
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if e1 != 0 {
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err = errnoErr(e1)
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}
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return
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}
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// Implemented in the runtime package (runtime/sys_darwin.go)
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func syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
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func syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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func syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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func rawSyscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
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func rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
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// Find the entry point for f. See comments in runtime/proc.go for the
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// function of the same name.
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//go:nosplit
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func funcPC(f func()) uintptr {
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return **(**uintptr)(unsafe.Pointer(&f))
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}
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