}

		var sloc []*Location
		for _, addr := range addrs {
			// Addresses from stack traces point to the next instruction after
			// each call. Adjust by -1 to land somewhere on the actual call.
			addr--
			loc := locs[addr]
			if locs[addr] == nil {
				loc = &Location{
					Address: addr,
				}
				p.Location = append(p.Location, loc)
				locs[addr] = loc
			}
			sloc = append(sloc, loc)
		}

	if err := d.validateTarget(network, address); err != nil {
		proxy, dst, _ := d.pathAddrs(address)
		return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
	}
	if ctx == nil {
		proxy, dst, _ := d.pathAddrs(address)
		return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: errors.New("nil context")}
	}

// Find the elf.Section of a given shared library that contains a given address.
func findShlibSection(ctxt *Link, path string, addr uint64) *elf.Section {
	for _, shlib := range ctxt.Shlibs {
		if shlib.Path == path {
			for _, sect := range shlib.File.Sections[1:] { // skip the NULL section
				if sect.Addr <= addr && addr < sect.Addr+sect.Size {
					return sect
				}
			}
		}
	}
	return nil
}

// the elfMapping field is set. It populates the base and isData fields and
// returns an error.
func (f *file) computeBase(addr uint64) error {
	if f == nil || f.m == nil {
		return nil
	}
	if addr < f.m.start || addr >= f.m.limit {
		return fmt.Errorf("specified address %x is outside the mapping range [%x, %x] for file %q", addr, f.m.start, f.m.limit, f.name)
	}
	ef, err := elfOpen(f.name)
	if err != nil {

	SYS_MSYNC         = 65  // { int msync(void *addr, size_t len, int flags); }
	SYS_VFORK         = 66  // { pid_t vfork(void); }
	SYS_SBRK          = 69  // { int sbrk(int incr); }
	SYS_SSTK          = 70  // { int sstk(int incr); }
	SYS_MUNMAP        = 73  // { int munmap(void *addr, size_t len); }
	SYS_MPROTECT      = 74  // { int mprotect(void *addr, size_t len, int prot); }

	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
	munmap func(addr uintptr, length uintptr) error
}

func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
	if length <= 0 {
		return nil, EINVAL
	}

	// Map the requested memory.
	addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)

	}
	return proxyURL, nil
}

// useProxy reports whether requests to addr should use a proxy,
// according to the NO_PROXY or no_proxy environment variable.
// addr is always a canonicalAddr with a host and port.
func (cfg *config) useProxy(addr string) bool {
	if len(addr) == 0 {
		return true
	}
	host, port, err := net.SplitHostPort(addr)
	if err != nil {
		return false
	}
	if host == "localhost" {

			}
			t.Parallel()

			ln := newLocalListener(t, network)
			switch network {
			case "unix", "unixpacket":
				defer os.Remove(ln.Addr().String())
			}
			defer ln.Close()

			c, err := Dial(ln.Addr().Network(), ln.Addr().String())
			if err != nil {
				t.Fatal(err)
			}
			switch network {
			case "unix", "unixpacket":
				defer os.Remove(c.LocalAddr().String())
			}

	SYS_MUNMAP         = 73  // { int sys_munmap(void *addr, size_t len); }
	SYS_MPROTECT       = 74  // { int sys_mprotect(void *addr, size_t len, \
	SYS_MADVISE        = 75  // { int sys_madvise(void *addr, size_t len, \
	SYS_UTIMES         = 76  // { int sys_utimes(const char *path, \
	SYS_FUTIMES        = 77  // { int sys_futimes(int fd, \
	SYS_MQUERY         = 78  // { void *sys_mquery(void *addr, size_t len, int prot, \

	return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
}

func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
	// As for ptracePeek, we need to align our accesses to deal
	// with the possibility of straddling an invalid page.

	// Leading edge.
	n := 0
	if addr%sizeofPtr != 0 {
		var buf [sizeofPtr]byte
		err = ptracePtr(peekReq, pid, addr-addr%sizeofPtr, unsafe.Pointer(&buf[0]))