n, err = preadv(fd, iovecs, off)
	return n, err
}

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

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

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

func Pwritev(fd int, iovs [][]byte, off int64) (n int, err error) {
	iovecs := bytes2iovec(iovs)

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"

//go:linkname procreadv libc_readv
//go:linkname procpreadv libc_preadv
//go:linkname procwritev libc_writev

	SYS_NLSTAT                   = 280 // { int nlstat(char *path, struct nstat *ub); }
	SYS_PREADV                   = 289 // { ssize_t preadv(int fd, struct iovec *iovp, \
	SYS_PWRITEV                  = 290 // { ssize_t pwritev(int fd, struct iovec *iovp, \
	SYS_FHOPEN                   = 298 // { int fhopen(const struct fhandle *u_fhp, \
	SYS_FHSTAT                   = 299 // { int fhstat(const struct fhandle *u_fhp, \

	SYS_NLSTAT                   = 280 // { int nlstat(char *path, struct nstat *ub); }
	SYS_PREADV                   = 289 // { ssize_t preadv(int fd, struct iovec *iovp, \
	SYS_PWRITEV                  = 290 // { ssize_t pwritev(int fd, struct iovec *iovp, \
	SYS_FHOPEN                   = 298 // { int fhopen(const struct fhandle *u_fhp, \
	SYS_FHSTAT                   = 299 // { int fhstat(const struct fhandle *u_fhp, \

	SYS_NLSTAT                   = 280 // { int nlstat(char *path, struct nstat *ub); }
	SYS_PREADV                   = 289 // { ssize_t preadv(int fd, struct iovec *iovp, \
	SYS_PWRITEV                  = 290 // { ssize_t pwritev(int fd, struct iovec *iovp, \
	SYS_FHOPEN                   = 298 // { int fhopen(const struct fhandle *u_fhp, \
	SYS_FHSTAT                   = 299 // { int fhstat(const struct fhandle *u_fhp, \

	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS___GETCWD             = 296 // { int|sys||__getcwd(char *bufp, size_t length); }
	SYS_FCHROOT              = 297 // { int|sys||fchroot(int fd); }

	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS___GETCWD             = 296 // { int|sys||__getcwd(char *bufp, size_t length); }
	SYS_FCHROOT              = 297 // { int|sys||fchroot(int fd); }

	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS___GETCWD             = 296 // { int|sys||__getcwd(char *bufp, size_t length); }
	SYS_FCHROOT              = 297 // { int|sys||fchroot(int fd); }

	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS___GETCWD             = 296 // { int|sys||__getcwd(char *bufp, size_t length); }
	SYS_FCHROOT              = 297 // { int|sys||fchroot(int fd); }

	SYS_PREADV               = 289 // { ssize_t|sys||preadv(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS_PWRITEV              = 290 // { ssize_t|sys||pwritev(int fd, const struct iovec *iovp, int iovcnt, int PAD, off_t offset); }
	SYS___GETCWD             = 296 // { int|sys||__getcwd(char *bufp, size_t length); }
	SYS_FCHROOT              = 297 // { int|sys||fchroot(int fd); }