mirror of
https://github.com/golang/go
synced 2024-10-03 05:11:21 -06:00
eb2b0ed5b5
Mac OS X 10.13 introduced APFS which stores nanosecond resolution timestamps. The implementation of os.Stat already returns full resolution timestamps, but os.Chtimes only sets timestamps with microsecond resolution. Fix this by using setattrlist on Darwin, which takes a struct timeval with nanosecond resolution. This is what Mac OS X 10.13 appears uses to implement utimensat, according to dtruss. Fixes #22528 Change-Id: I397dabef6b2b73a081382999aa4c4405ab8c6015 Reviewed-on: https://go-review.googlesource.com/74952 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
527 lines
13 KiB
Go
527 lines
13 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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SYS_GETATTRLIST,
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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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//sysnb pipe() (r int, w int, 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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p[0], p[1], err = pipe()
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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(SYS_GETFSSTAT64, 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 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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SYS_SETATTRLIST,
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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 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 Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
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//sys Fstatfs(fd int, stat *Statfs_t) (err error) = SYS_FSTATFS64
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//sys Fsync(fd int) (err error)
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//sys Ftruncate(fd int, length int64) (err error)
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//sys Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) = SYS_GETDIRENTRIES64
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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 Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64
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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 Stat(path string, stat *Stat_t) (err error) = SYS_STAT64
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//sys Statfs(path string, stat *Statfs_t) (err error) = SYS_STATFS64
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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 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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//sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
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//sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE
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/*
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* Unimplemented
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*/
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// Profil
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// Sigaction
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// Sigprocmask
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// Getlogin
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// Sigpending
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// Sigaltstack
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// Ioctl
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// Reboot
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// Execve
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// Vfork
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// Sbrk
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// Sstk
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// Ovadvise
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// Mincore
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// Setitimer
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// Swapon
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// Select
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// Sigsuspend
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// Readv
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// Writev
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// Nfssvc
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// Getfh
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// Quotactl
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// Mount
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// Csops
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// Waitid
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// Add_profil
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// Kdebug_trace
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// Sigreturn
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// Mmap
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// Mlock
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// Munlock
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// Atsocket
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// Kqueue_from_portset_np
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// Kqueue_portset
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// Getattrlist
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// Setattrlist
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// Getdirentriesattr
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// Searchfs
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// Delete
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// Copyfile
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// Poll
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// Watchevent
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// Waitevent
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// Modwatch
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// Getxattr
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// Fgetxattr
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// Setxattr
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// Fsetxattr
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// Removexattr
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// Fremovexattr
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// Listxattr
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// Flistxattr
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// Fsctl
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// Initgroups
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// Posix_spawn
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// Nfsclnt
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// Fhopen
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// Minherit
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// Semsys
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// Msgsys
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// Shmsys
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// Semctl
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// Semget
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// Semop
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// Msgctl
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// Msgget
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// Msgsnd
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// Msgrcv
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// Shmat
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// Shmctl
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// Shmdt
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// Shmget
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// Shm_open
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// Shm_unlink
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// Sem_open
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// Sem_close
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// Sem_unlink
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// Sem_wait
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// Sem_trywait
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// Sem_post
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// Sem_getvalue
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// Sem_init
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// Sem_destroy
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// Open_extended
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// Umask_extended
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// Stat_extended
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// Lstat_extended
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// Fstat_extended
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// Chmod_extended
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// Fchmod_extended
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// Access_extended
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// Settid
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// Gettid
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// Setsgroups
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// Getsgroups
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// Setwgroups
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// Getwgroups
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// Mkfifo_extended
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// Mkdir_extended
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// Identitysvc
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// Shared_region_check_np
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// Shared_region_map_np
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// __pthread_mutex_destroy
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// __pthread_mutex_init
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// __pthread_mutex_lock
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// __pthread_mutex_trylock
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// __pthread_mutex_unlock
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// __pthread_cond_init
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// __pthread_cond_destroy
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// __pthread_cond_broadcast
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// __pthread_cond_signal
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// Setsid_with_pid
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// __pthread_cond_timedwait
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// Aio_fsync
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// Aio_return
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// Aio_suspend
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// Aio_cancel
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// Aio_error
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// Aio_read
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// Aio_write
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// Lio_listio
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// __pthread_cond_wait
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// Iopolicysys
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// Mlockall
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// Munlockall
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// __pthread_kill
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// __pthread_sigmask
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// __sigwait
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// __disable_threadsignal
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// __pthread_markcancel
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// __pthread_canceled
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// __semwait_signal
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// Proc_info
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// sendfile
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// Stat64_extended
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// Lstat64_extended
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// Fstat64_extended
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// __pthread_chdir
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// __pthread_fchdir
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// Audit
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// Auditon
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// Getauid
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// Setauid
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// Getaudit
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// Setaudit
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// Getaudit_addr
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// Setaudit_addr
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// Auditctl
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// Bsdthread_create
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// Bsdthread_terminate
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// Stack_snapshot
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// Bsdthread_register
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// Workq_open
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// Workq_ops
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// __mac_execve
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// __mac_syscall
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// __mac_get_file
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// __mac_set_file
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// __mac_get_link
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// __mac_set_link
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// __mac_get_proc
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// __mac_set_proc
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// __mac_get_fd
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// __mac_set_fd
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// __mac_get_pid
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// __mac_get_lcid
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// __mac_get_lctx
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// __mac_set_lctx
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// Setlcid
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// Read_nocancel
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// Write_nocancel
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// Open_nocancel
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// Close_nocancel
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// Wait4_nocancel
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// Recvmsg_nocancel
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// Sendmsg_nocancel
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// Recvfrom_nocancel
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// Accept_nocancel
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// Msync_nocancel
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// Fcntl_nocancel
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// Select_nocancel
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// Fsync_nocancel
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// Connect_nocancel
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// Sigsuspend_nocancel
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// Readv_nocancel
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// Writev_nocancel
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// Sendto_nocancel
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// Pread_nocancel
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// Pwrite_nocancel
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// Waitid_nocancel
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// Poll_nocancel
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// Msgsnd_nocancel
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// Msgrcv_nocancel
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// Sem_wait_nocancel
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// Aio_suspend_nocancel
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// __sigwait_nocancel
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// __semwait_signal_nocancel
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// __mac_mount
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// __mac_get_mount
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// __mac_getfsstat
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