415 lines
12 KiB
Go
415 lines
12 KiB
Go
// Copyright 2009 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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// GNU/Linux library calls.
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package syscall
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import (
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"internal/race"
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"unsafe"
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)
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//sys Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
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//__go_openat(dirfd _C_int, path *byte, flags _C_int, mode Mode_t) _C_int
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//sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error)
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//futimesat(dirfd _C_int, path *byte, times *[2]Timeval) _C_int
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func Futimesat(dirfd int, path string, tv []Timeval) (err error) {
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if len(tv) != 2 {
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return EINVAL
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}
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return futimesat(dirfd, StringBytePtr(path), (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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func Futimes(fd int, tv []Timeval) (err error) {
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// Believe it or not, this is the best we can do on GNU/Linux
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// (and is what glibc does).
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return Utimes("/proc/self/fd/"+itoa(fd), tv)
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}
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//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
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//ptrace(request _C_int, pid Pid_t, addr *byte, data *byte) _C_long
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//sysnb raw_ptrace(request int, pid int, addr *byte, data *byte) (err Errno)
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//ptrace(request _C_int, pid Pid_t, addr *byte, data *byte) _C_long
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func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
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// The peek requests are machine-size oriented, so we wrap it
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// to retrieve arbitrary-length data.
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// The ptrace syscall differs from glibc's ptrace.
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// Peeks returns the word in *data, not as the return value.
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var buf [sizeofPtr]byte
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// Leading edge. PEEKTEXT/PEEKDATA don't require aligned
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// access (PEEKUSER warns that it might), but if we don't
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// align our reads, we might straddle an unmapped page
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// boundary and not get the bytes leading up to the page
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// boundary.
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n := 0
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if addr%sizeofPtr != 0 {
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err = ptrace(req, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
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if err != nil {
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return 0, err
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}
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n += copy(out, buf[addr%sizeofPtr:])
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out = out[n:]
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}
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// Remainder.
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for len(out) > 0 {
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// We use an internal buffer to gaurantee alignment.
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// It's not documented if this is necessary, but we're paranoid.
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err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
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if err != nil {
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return n, err
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}
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copied := copy(out, buf[0:])
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n += copied
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out = out[copied:]
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}
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return n, nil
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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 ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
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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 ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
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}
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func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
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// As for ptracePeek, we need to align our accesses to deal
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// with the possibility of straddling an invalid page.
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// Leading edge.
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n := 0
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if addr%sizeofPtr != 0 {
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var buf [sizeofPtr]byte
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err = ptrace(peekReq, pid, addr-addr%sizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
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if err != nil {
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return 0, err
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}
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n += copy(buf[addr%sizeofPtr:], data)
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word := *((*uintptr)(unsafe.Pointer(&buf[0])))
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err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word)
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if err != nil {
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return 0, err
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}
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data = data[n:]
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}
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// Interior.
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for len(data) > int(sizeofPtr) {
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word := *((*uintptr)(unsafe.Pointer(&data[0])))
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err = ptrace(pokeReq, pid, addr+uintptr(n), word)
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if err != nil {
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return n, err
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}
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n += int(sizeofPtr)
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data = data[sizeofPtr:]
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}
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// Trailing edge.
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if len(data) > 0 {
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var buf [sizeofPtr]byte
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err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
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if err != nil {
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return n, err
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}
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copy(buf[0:], data)
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word := *((*uintptr)(unsafe.Pointer(&buf[0])))
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err = ptrace(pokeReq, pid, addr+uintptr(n), word)
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if err != nil {
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return n, err
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}
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n += len(data)
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}
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return n, nil
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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 ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
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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 ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
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}
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func PtraceSetOptions(pid int, options int) (err error) {
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return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
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}
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func PtraceGetEventMsg(pid int) (msg uint, err error) {
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var data _C_long
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err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
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msg = uint(data)
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return
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}
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func PtraceCont(pid int, signal int) (err error) {
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return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
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}
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func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
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func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
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func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
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//sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
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//reboot(magic1 _C_uint, magic2 _C_uint, cmd _C_int, arg *byte) _C_int
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func Reboot(cmd int) (err error) {
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return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
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}
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//sys accept4(fd int, sa *RawSockaddrAny, len *Socklen_t, flags int) (nfd int, err error)
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//accept4(fd _C_int, sa *RawSockaddrAny, len *Socklen_t, flags _C_int) _C_int
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func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
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var rsa RawSockaddrAny
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var len Socklen_t = SizeofSockaddrAny
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nfd, err = accept4(fd, &rsa, &len, flags)
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if err != nil {
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return -1, nil, err
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}
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sa, err = anyToSockaddr(&rsa)
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if err != nil {
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Close(nfd)
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return -1, nil, err
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}
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return nfd, sa, nil
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}
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//sys Acct(path string) (err error)
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//acct(path *byte) _C_int
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//sys Adjtimex(buf *Timex) (state int, err error)
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//adjtimex(buf *Timex) _C_int
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//sysnb Dup3(oldfd int, newfd int, flags int) (err error)
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//dup3(oldfd _C_int, newfd _C_int, flags _C_int) _C_int
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//sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
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//faccessat(dirfd _C_int, pathname *byte, mode _C_int, flags _C_int) _C_int
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//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
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//fallocate(fd _C_int, mode _C_int, offset Offset_t, len Offset_t) _C_int
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//sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
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//fchmodat(dirfd _C_int, pathname *byte, mode Mode_t, flags _C_int) _C_int
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//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
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//fchownat(dirfd _C_int, path *byte, owner Uid_t, group Gid_t, flags _C_int) _C_int
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//sys Flock(fd int, how int) (err error)
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//flock(fd _C_int, how _C_int) _C_int
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//sys Fstatfs(fd int, buf *Statfs_t) (err error)
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//fstatfs(fd _C_int, buf *Statfs_t) _C_int
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func Gettid() (tid int) {
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r1, _, _ := Syscall(SYS_GETTID, 0, 0, 0)
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return int(r1)
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}
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func Getdents(fd int, buf []byte) (n int, err error) {
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var p *byte
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if len(buf) > 0 {
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p = &buf[0]
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} else {
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p = (*byte)(unsafe.Pointer(&_zero))
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}
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s := SYS_GETDENTS64
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if s == 0 {
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s = SYS_GETDENTS
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}
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r1, _, errno := Syscall(uintptr(s), uintptr(fd), uintptr(unsafe.Pointer(p)), uintptr(len(buf)))
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n = int(r1)
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if n < 0 {
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err = errno
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}
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return
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}
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func clen(n []byte) int {
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for i := 0; i < len(n); i++ {
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if n[i] == 0 {
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return i
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}
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}
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return len(n)
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}
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func ReadDirent(fd int, buf []byte) (n int, err error) {
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return Getdents(fd, buf)
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}
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func ParseDirent(buf []byte, max int, names []string) (consumed int, count int, newnames []string) {
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origlen := len(buf)
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count = 0
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for max != 0 && len(buf) > 0 {
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dirent := (*Dirent)(unsafe.Pointer(&buf[0]))
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buf = buf[dirent.Reclen:]
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if dirent.Ino == 0 { // File absent in directory.
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continue
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}
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bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
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var name = string(bytes[0:clen(bytes[:])])
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if name == "." || name == ".." { // Useless names
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continue
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}
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max--
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count++
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names = append(names, name)
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}
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return origlen - len(buf), count, names
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}
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//sys Getxattr(path string, attr string, dest []byte) (sz int, err error)
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//getxattr(path *byte, attr *byte, buf *byte, count Size_t) Ssize_t
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//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
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//inotify_add_watch(fd _C_int, pathname *byte, mask uint32) _C_int
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//sysnb InotifyInit() (fd int, err error)
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//inotify_init() _C_int
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//sysnb InotifyInit1(flags int) (fd int, err error)
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//inotify_init1(flags _C_int) _C_int
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//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
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//inotify_rm_watch(fd _C_int, wd uint32) _C_int
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//sys Klogctl(typ int, buf []byte) (n int, err error)
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//klogctl(typ _C_int, bufp *byte, len _C_int) _C_int
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//sys Listxattr(path string, dest []byte) (sz int, err error)
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//listxattr(path *byte, list *byte, size Size_t) Ssize_t
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//sys Mkdirat(dirfd int, path string, mode uint32) (err error)
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//mkdirat(dirfd _C_int, path *byte, mode Mode_t) _C_int
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//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
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//mknodat(dirfd _C_int, path *byte, mode Mode_t, dev _dev_t) _C_int
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//sysnb pipe2(p *[2]_C_int, flags int) (err error)
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//pipe2(p *[2]_C_int, flags _C_int) _C_int
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func Pipe2(p []int, flags 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 pp [2]_C_int
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err = pipe2(&pp, flags)
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p[0] = int(pp[0])
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p[1] = int(pp[1])
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return
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}
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//sys PivotRoot(newroot string, putold string) (err error)
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//pivot_root(newroot *byte, putold *byte) _C_int
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//sys Removexattr(path string, attr string) (err error)
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//removexattr(path *byte, name *byte) _C_int
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//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
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//renameat(olddirfd _C_int, oldpath *byte, newdirfd _C_int, newpath *byte) _C_int
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//sys sendfile(outfd int, infd int, offset *Offset_t, count int) (written int, err error)
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//sendfile64(outfd _C_int, infd _C_int, offset *Offset_t, count Size_t) Ssize_t
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func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
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if race.Enabled {
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race.ReleaseMerge(unsafe.Pointer(&ioSync))
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}
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var soff Offset_t
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var psoff *Offset_t
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if offset != nil {
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soff = Offset_t(*offset)
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psoff = &soff
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}
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written, err = sendfile(outfd, infd, psoff, count)
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if offset != nil {
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*offset = int64(soff)
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}
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return
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}
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//sys Setfsgid(gid int) (err error)
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//setfsgid(gid Gid_t) _C_int
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//sys Setfsuid(uid int) (err error)
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//setfsuid(uid Uid_t) _C_int
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//sysnb Setresgid(rgid int, egid int, sgid int) (err error)
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//setresgid(rgid Gid_t, egid Gid_t, sgid Gid_t) _C_int
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//sysnb Setresuid(ruid int, eguid int, suid int) (err error)
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//setresuid(ruid Uid_t, euid Uid_t, suid Uid_t) _C_int
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//sys Setxattr(path string, attr string, data []byte, flags int) (err error)
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//setxattr(path *byte, name *byte, value *byte, size Size_t, flags _C_int) _C_int
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//sys splice(rfd int, roff *_loff_t, wfd int, woff *_loff_t, len int, flags int) (n int64, err error)
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//splice(rfd _C_int, roff *_loff_t, wfd _C_int, woff *_loff_t, len Size_t, flags _C_uint) Ssize_t
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func Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) {
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var lroff _loff_t
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var plroff *_loff_t
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if roff != nil {
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lroff = _loff_t(*roff)
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plroff = &lroff
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}
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var lwoff _loff_t
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var plwoff *_loff_t
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if woff != nil {
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lwoff = _loff_t(*woff)
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plwoff = &lwoff
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}
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n, err = splice(rfd, plroff, wfd, plwoff, len, flags)
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if roff != nil {
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*roff = int64(lroff)
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}
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if woff != nil {
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*woff = int64(lwoff)
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}
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return
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}
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//sys Statfs(path string, buf *Statfs_t) (err error)
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//statfs(path *byte, buf *Statfs_t) _C_int
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//sys SyncFileRange(fd int, off int64, n int64, flags int) (err error)
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//sync_file_range(fd _C_int, off Offset_t, n Offset_t, flags _C_uint) _C_int
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//sysnb Sysinfo(info *Sysinfo_t) (err error)
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//sysinfo(info *Sysinfo_t) _C_int
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//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
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//tee(rfd _C_int, wfd _C_int, len Size_t, flags _C_uint) Ssize_t
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func Tgkill(tgid int, tid int, sig Signal) error {
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r1, _, errno := Syscall(SYS_TGKILL, uintptr(tgid), uintptr(tid), uintptr(sig))
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if r1 < 0 {
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return errno
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}
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return nil
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}
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//sys unlinkat(dirfd int, path string, flags int) (err error)
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//unlinkat(dirfd _C_int, path *byte, flags _C_int) _C_int
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func Unlinkat(dirfd int, path string) (err error) {
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return unlinkat(dirfd, path, 0)
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}
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//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
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//umount2(target *byte, flags _C_int) _C_int
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//sys Unshare(flags int) (err error)
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//unshare(flags _C_int) _C_int
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