iovecs[i].Base = &b[0]
		} else {
			iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero))
		}
	}
	return iovecs
}

//sys	readv(fd int, iovs []Iovec) (n int, err error)

func Readv(fd int, iovs [][]byte) (n int, err error) {
	iovecs := bytes2iovec(iovs)
	n, err = readv(fd, iovecs)
	return n, err
}

//sys	preadv(fd int, iovs []Iovec, off int64) (n int, err error)

// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build illumos && amd64

package unix

import (
	"unsafe"
)

//go:cgo_import_dynamic libc_readv readv "libc.so"
//go:cgo_import_dynamic libc_preadv preadv "libc.so"
//go:cgo_import_dynamic libc_writev writev "libc.so"
//go:cgo_import_dynamic libc_pwritev pwritev "libc.so"
//go:cgo_import_dynamic libc_accept4 accept4 "libsocket.so"

}

func (a *IPAddr) toLocal(net string) sockaddr {
	return &IPAddr{loopbackIP(net), a.Zone}
}

func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
	// TODO(cw,rsc): consider using readv if we know the family
	// type to avoid the header trim/copy
	var addr *IPAddr
	n, sa, err := c.fd.readFrom(b)
	switch sa := sa.(type) {
	case *syscall.SockaddrInet4:
		addr = &IPAddr{IP: sa.Addr[0:]}

  add_attrs(b_identity.node());
  auto read_u = ops::ReadVariableOp(scope.WithOpName("ReadU"), arg4, DT_FLOAT);
  add_attrs(read_u.node());
  auto read_v = ops::ReadVariableOp(scope.WithOpName("ReadV"), arg5, DT_FLOAT);
  add_attrs(read_v.node());
  auto read_w = ops::ReadVariableOp(scope.WithOpName("ReadW"), arg6, DT_FLOAT);
  add_attrs(read_w.node());

  auto e = ops::Add(scope.WithOpName("E"), arg0, arg2);

	SYS_GETRUSAGE                = 117 // { int getrusage(int who, \
	SYS_GETSOCKOPT               = 118 // { int getsockopt(int s, int level, int name, \
	SYS_READV                    = 120 // { int readv(int fd, struct iovec *iovp, \
	SYS_WRITEV                   = 121 // { int writev(int fd, struct iovec *iovp, \
	SYS_SETTIMEOFDAY             = 122 // { int settimeofday(struct timeval *tv, \

	SYS_GETRUSAGE                = 117 // { int getrusage(int who, \
	SYS_GETSOCKOPT               = 118 // { int getsockopt(int s, int level, int name, \
	SYS_READV                    = 120 // { int readv(int fd, struct iovec *iovp, \
	SYS_WRITEV                   = 121 // { int writev(int fd, struct iovec *iovp, \
	SYS_SETTIMEOFDAY             = 122 // { int settimeofday(struct timeval *tv, \

	SYS_GETRUSAGE                = 117 // { int getrusage(int who, \
	SYS_GETSOCKOPT               = 118 // { int getsockopt(int s, int level, int name, \
	SYS_READV                    = 120 // { int readv(int fd, struct iovec *iovp, \
	SYS_WRITEV                   = 121 // { int writev(int fd, struct iovec *iovp, \
	SYS_SETTIMEOFDAY             = 122 // { int settimeofday(struct timeval *tv, \

	return uintptr(offs), uintptr(uint64(offs) >> (longBits - 1) >> 1) // two shifts to avoid false positive in vet
}

func Readv(fd int, iovs [][]byte) (n int, err error) {
	iovecs := make([]Iovec, 0, minIovec)
	iovecs = appendBytes(iovecs, iovs)
	n, err = readv(fd, iovecs)
	readvRacedetect(iovecs, n, err)
	return n, err
}

func Preadv(fd int, iovs [][]byte, offset int64) (n int, err error) {

	SYS_GETRUSAGE     = 117 // { int getrusage(int who, struct rusage *rusage); }
	SYS_GETSOCKOPT    = 118 // { int getsockopt(int s, int level, int name, \
	SYS_READV         = 120 // { int readv(int fd, struct iovec *iovp, u_int iovcnt); }
	SYS_WRITEV        = 121 // { int writev(int fd, struct iovec *iovp, \
	SYS_SETTIMEOFDAY  = 122 // { int settimeofday(struct timeval *tv, \

	SYS_GETSOCKOPT           = 118 // { int|sys||getsockopt(int s, int level, int name, void *val, socklen_t *avalsize); }
	SYS_READV                = 120 // { ssize_t|sys||readv(int fd, const struct iovec *iovp, int iovcnt); }
	SYS_WRITEV               = 121 // { ssize_t|sys||writev(int fd, const struct iovec *iovp, int iovcnt); }