зеркало из https://github.com/golang/sys.git
456 строки
16 KiB
Go
456 строки
16 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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// FreeBSD 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 unix
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import (
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"errors"
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"sync"
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"unsafe"
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)
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// See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html.
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var (
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osreldateOnce sync.Once
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osreldate uint32
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)
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func supportsABI(ver uint32) bool {
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osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })
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return osreldate >= ver
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}
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// SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets.
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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 [46]int8
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raw RawSockaddrDatalink
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}
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func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
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return nil, EAFNOSUPPORT
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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{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))
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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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func Pipe(p []int) (err error) {
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return Pipe2(p, 0)
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}
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//sysnb pipe2(p *[2]_C_int, flags int) (err error)
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func Pipe2(p []int, flags int) error {
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if len(p) != 2 {
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return EINVAL
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}
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var pp [2]_C_int
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err := pipe2(&pp, flags)
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if err == nil {
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p[0] = int(pp[0])
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p[1] = int(pp[1])
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}
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return err
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}
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func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
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var value IPMreqn
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vallen := _Socklen(SizeofIPMreqn)
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errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
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return &value, errno
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}
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func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
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}
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// GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct.
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// The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively.
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func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {
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x := new(Xucred)
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vallen := _Socklen(SizeofXucred)
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err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)
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return x, err
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}
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func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {
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var rsa RawSockaddrAny
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var len _Socklen = SizeofSockaddrAny
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nfd, err = accept4(fd, &rsa, &len, flags)
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if err != nil {
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return
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}
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if len > SizeofSockaddrAny {
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panic("RawSockaddrAny too small")
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}
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sa, err = anyToSockaddr(fd, &rsa)
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if err != nil {
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Close(nfd)
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nfd = 0
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}
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return
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}
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//sys Getcwd(buf []byte) (n int, err error) = SYS___GETCWD
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func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
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var (
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_p0 unsafe.Pointer
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bufsize uintptr
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)
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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_GETFSSTAT, 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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//sys ioctl(fd int, req uint, arg uintptr) (err error) = SYS_IOCTL
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//sys ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL
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//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL
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func Uname(uname *Utsname) error {
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mib := []_C_int{CTL_KERN, KERN_OSTYPE}
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n := unsafe.Sizeof(uname.Sysname)
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// Suppress ENOMEM errors to be compatible with the C library __xuname() implementation.
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if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
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return err
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}
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mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
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n = unsafe.Sizeof(uname.Nodename)
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if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
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return err
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}
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mib = []_C_int{CTL_KERN, KERN_OSRELEASE}
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n = unsafe.Sizeof(uname.Release)
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if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
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return err
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}
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mib = []_C_int{CTL_KERN, KERN_VERSION}
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n = unsafe.Sizeof(uname.Version)
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if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
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return err
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}
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// The version might have newlines or tabs in it, convert them to
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// spaces.
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for i, b := range uname.Version {
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if b == '\n' || b == '\t' {
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if i == len(uname.Version)-1 {
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uname.Version[i] = 0
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} else {
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uname.Version[i] = ' '
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}
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}
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}
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mib = []_C_int{CTL_HW, HW_MACHINE}
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n = unsafe.Sizeof(uname.Machine)
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if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
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return err
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}
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return nil
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}
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func Stat(path string, st *Stat_t) (err error) {
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return Fstatat(AT_FDCWD, path, st, 0)
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}
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func Lstat(path string, st *Stat_t) (err error) {
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return Fstatat(AT_FDCWD, path, st, AT_SYMLINK_NOFOLLOW)
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}
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func Getdents(fd int, buf []byte) (n int, err error) {
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return Getdirentries(fd, buf, nil)
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}
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func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
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if basep == nil || unsafe.Sizeof(*basep) == 8 {
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return getdirentries(fd, buf, (*uint64)(unsafe.Pointer(basep)))
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}
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// The syscall needs a 64-bit base. On 32-bit machines
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// we can't just use the basep passed in. See #32498.
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var base uint64 = uint64(*basep)
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n, err = getdirentries(fd, buf, &base)
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*basep = uintptr(base)
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if base>>32 != 0 {
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// We can't stuff the base back into a uintptr, so any
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// future calls would be suspect. Generate an error.
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// EIO is allowed by getdirentries.
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err = EIO
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}
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return
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}
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func Mknod(path string, mode uint32, dev uint64) (err error) {
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return Mknodat(AT_FDCWD, path, mode, dev)
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}
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func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
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if raceenabled {
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raceReleaseMerge(unsafe.Pointer(&ioSync))
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}
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return sendfile(outfd, infd, offset, count)
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}
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//sys ptrace(request int, pid int, addr uintptr, data int) (err error)
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//sys ptracePtr(request int, pid int, addr unsafe.Pointer, data int) (err error) = SYS_PTRACE
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func PtraceAttach(pid int) (err error) {
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return ptrace(PT_ATTACH, pid, 0, 0)
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}
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func PtraceCont(pid int, signal int) (err error) {
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return ptrace(PT_CONTINUE, pid, 1, signal)
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}
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func PtraceDetach(pid int) (err error) {
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return ptrace(PT_DETACH, pid, 1, 0)
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}
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func PtraceGetFpRegs(pid int, fpregsout *FpReg) (err error) {
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return ptracePtr(PT_GETFPREGS, pid, unsafe.Pointer(fpregsout), 0)
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}
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func PtraceGetRegs(pid int, regsout *Reg) (err error) {
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return ptracePtr(PT_GETREGS, pid, unsafe.Pointer(regsout), 0)
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}
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func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
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ioDesc := PtraceIoDesc{
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Op: int32(req),
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Offs: offs,
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}
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if countin > 0 {
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_ = out[:countin] // check bounds
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ioDesc.Addr = &out[0]
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} else if out != nil {
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ioDesc.Addr = (*byte)(unsafe.Pointer(&_zero))
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}
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ioDesc.SetLen(countin)
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err = ptracePtr(PT_IO, pid, unsafe.Pointer(&ioDesc), 0)
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return int(ioDesc.Len), err
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}
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func PtraceLwpEvents(pid int, enable int) (err error) {
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return ptrace(PT_LWP_EVENTS, pid, 0, enable)
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}
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func PtraceLwpInfo(pid int, info *PtraceLwpInfoStruct) (err error) {
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return ptracePtr(PT_LWPINFO, pid, unsafe.Pointer(info), int(unsafe.Sizeof(*info)))
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}
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func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
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return PtraceIO(PIOD_READ_D, pid, addr, out, SizeofLong)
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}
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func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
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return PtraceIO(PIOD_READ_I, pid, addr, out, SizeofLong)
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}
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func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
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return PtraceIO(PIOD_WRITE_D, pid, addr, data, SizeofLong)
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}
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func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
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return PtraceIO(PIOD_WRITE_I, pid, addr, data, SizeofLong)
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}
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func PtraceSetRegs(pid int, regs *Reg) (err error) {
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return ptracePtr(PT_SETREGS, pid, unsafe.Pointer(regs), 0)
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}
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func PtraceSingleStep(pid int) (err error) {
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return ptrace(PT_STEP, pid, 1, 0)
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}
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func Dup3(oldfd, newfd, flags int) error {
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if oldfd == newfd || flags&^O_CLOEXEC != 0 {
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return EINVAL
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}
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how := F_DUP2FD
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if flags&O_CLOEXEC != 0 {
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how = F_DUP2FD_CLOEXEC
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}
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_, err := fcntl(oldfd, how, newfd)
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return err
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}
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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 CapEnter() (err error)
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//sys capRightsGet(version int, fd int, rightsp *CapRights) (err error) = SYS___CAP_RIGHTS_GET
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//sys capRightsLimit(fd int, rightsp *CapRights) (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 ClockGettime(clockid int32, time *Timespec) (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 Exit(code int)
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//sys ExtattrGetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrSetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrDeleteFd(fd int, attrnamespace int, attrname string) (err error)
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//sys ExtattrListFd(fd int, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrGetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrSetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrDeleteFile(file string, attrnamespace int, attrname string) (err error)
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//sys ExtattrListFile(file string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrGetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrSetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
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//sys ExtattrDeleteLink(link string, attrnamespace int, attrname string) (err error)
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//sys ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
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//sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_POSIX_FADVISE
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//sys Faccessat(dirfd int, path string, mode uint32, flags 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 Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
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//sys Fchown(fd int, uid int, gid int) (err error)
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//sys Fchownat(dirfd int, path string, uid int, gid int, flags 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)
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//sys Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
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//sys Fstatfs(fd int, stat *Statfs_t) (err error)
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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 *uint64) (n int, 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 Gettimeofday(tv *Timeval) (err error)
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//sysnb Getuid() (uid int)
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//sys Issetugid() (tainted bool)
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//sys Kill(pid int, signum syscall.Signal) (err error)
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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 Linkat(pathfd int, path string, linkfd int, link string, flags int) (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 Mkdirat(dirfd int, path string, mode uint32) (err error)
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//sys Mkfifo(path string, mode uint32) (err error)
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//sys Mknodat(fd int, path string, mode uint32, dev uint64) (err error)
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//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
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//sys Open(path string, mode int, perm uint32) (fd int, err error)
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//sys Openat(fdat int, 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 Readlinkat(dirfd int, 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 Renameat(fromfd int, from string, tofd int, 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(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
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//sysnb 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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//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 Setresgid(rgid int, egid int, sgid int) (err error)
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//sysnb Setresuid(ruid int, euid int, suid int) (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 Statfs(path string, stat *Statfs_t) (err error)
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//sys Symlink(path string, link string) (err error)
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//sys Symlinkat(oldpath string, newdirfd int, newpath 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 Unlinkat(dirfd int, path string, flags int) (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 accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
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//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
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