golang/mikael/madonctl: comparison vendor/golang.org/x/sys/unix/syscall

equal deleted inserted replaced

-:8f478162d991
+:05c40b36d3b2
 			// send at least one normal byte
 			if sockType != SOCK_DGRAM {
 				var iova [1]Iovec
 				iova[0].Base = &dummy
 				iova[0].SetLen(1)
+				iov = iova[:]
 			}
 		}
 		msg.Control = &oob[0]
 		msg.SetControllen(len(oob))
 	}
 //sys	preadv(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PREADV
 //sys	pwritev(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PWRITEV
 //sys	preadv2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PREADV2
 //sys	pwritev2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PWRITEV2
-func bytes2iovec(bs [][]byte) []Iovec {
+// minIovec is the size of the small initial allocation used by
-	iovecs := make([]Iovec, len(bs))
+// Readv, Writev, etc.
-	for i, b := range bs {
+//
-		iovecs[i].SetLen(len(b))
+// This small allocation gets stack allocated, which lets the
+// common use case of len(iovs) <= minIovs avoid more expensive
+// heap allocations.
+const minIovec = 8
+// appendBytes converts bs to Iovecs and appends them to vecs.
+func appendBytes(vecs []Iovec, bs [][]byte) []Iovec {
+	for _, b := range bs {
+		var v Iovec
+		v.SetLen(len(b))
 		if len(b) > 0 {
-			iovecs[i].Base = &b[0]
+			v.Base = &b[0]
 		} else {
-			iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero))
+			v.Base = (*byte)(unsafe.Pointer(&_zero))
 		}
-	}
+		vecs = append(vecs, v)
-	return iovecs
+	}
-}
+	return vecs
+}
-// offs2lohi splits offs into its lower and upper unsigned long. On 64-bit
-// systems, hi will always be 0. On 32-bit systems, offs will be split in half.
+// offs2lohi splits offs into its low and high order bits.
-// preadv/pwritev chose this calling convention so they don't need to add a
-// padding-register for alignment on ARM.
 func offs2lohi(offs int64) (lo, hi uintptr) {
-	return uintptr(offs), uintptr(uint64(offs) >> SizeofLong)
+	const longBits = SizeofLong * 8
+	return uintptr(offs), uintptr(uint64(offs) >> longBits)
 }
 func Readv(fd int, iovs [][]byte) (n int, err error) {
-	iovecs := bytes2iovec(iovs)
+	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) {
-	iovecs := bytes2iovec(iovs)
+	iovecs := make([]Iovec, 0, minIovec)
+	iovecs = appendBytes(iovecs, iovs)
 	lo, hi := offs2lohi(offset)
 	n, err = preadv(fd, iovecs, lo, hi)
 	readvRacedetect(iovecs, n, err)
 	return n, err
 }
 func Preadv2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) {
-	iovecs := bytes2iovec(iovs)
+	iovecs := make([]Iovec, 0, minIovec)
+	iovecs = appendBytes(iovecs, iovs)
 	lo, hi := offs2lohi(offset)
 	n, err = preadv2(fd, iovecs, lo, hi, flags)
 	readvRacedetect(iovecs, n, err)
 	return n, err
 }
 		raceAcquire(unsafe.Pointer(&ioSync))
 	}
 }
 func Writev(fd int, iovs [][]byte) (n int, err error) {
-	iovecs := bytes2iovec(iovs)
+	iovecs := make([]Iovec, 0, minIovec)
+	iovecs = appendBytes(iovecs, iovs)
 	if raceenabled {
 		raceReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	n, err = writev(fd, iovecs)
 	writevRacedetect(iovecs, n)
 	return n, err
 }
 func Pwritev(fd int, iovs [][]byte, offset int64) (n int, err error) {
-	iovecs := bytes2iovec(iovs)
+	iovecs := make([]Iovec, 0, minIovec)
+	iovecs = appendBytes(iovecs, iovs)
 	if raceenabled {
 		raceReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	lo, hi := offs2lohi(offset)
 	n, err = pwritev(fd, iovecs, lo, hi)
 	writevRacedetect(iovecs, n)
 	return n, err
 }
 func Pwritev2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) {
-	iovecs := bytes2iovec(iovs)
+	iovecs := make([]Iovec, 0, minIovec)
+	iovecs = appendBytes(iovecs, iovs)
 	if raceenabled {
 		raceReleaseMerge(unsafe.Pointer(&ioSync))
 	}
 	lo, hi := offs2lohi(offset)
 	n, err = pwritev2(fd, iovecs, lo, hi, flags)
 func (fh *FileHandle) Bytes() []byte {
 	n := fh.Size()
 	if n == 0 {
 		return nil
 	}
-	return (*[1 << 30]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&fh.fileHandle.Type)) + 4))[:n:n]
+	return unsafe.Slice((*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&fh.fileHandle.Type))+4)), n)
 }
 // NameToHandleAt wraps the name_to_handle_at system call; it obtains
 // a handle for a path name.
 func NameToHandleAt(dirfd int, path string, flags int) (handle FileHandle, mountID int, err error) {
 	if err := setitimer(int(which), &it, &prev); err != nil {
 		return Itimerval{}, err
 	}
 	return prev, nil
+}
+//sysnb	rtSigprocmask(how int, set *Sigset_t, oldset *Sigset_t, sigsetsize uintptr) (err error) = SYS_RT_SIGPROCMASK
+func PthreadSigmask(how int, set, oldset *Sigset_t) error {
+	if oldset != nil {
+		// Explicitly clear in case Sigset_t is larger than _C__NSIG.
+		*oldset = Sigset_t{}
+	}
+	return rtSigprocmask(how, set, oldset, _C__NSIG/8)
 }
 /*
 * Unimplemented
 */
 // Readv
 // RemapFilePages
 // RestartSyscall
 // RtSigaction
 // RtSigpending
-// RtSigprocmask
 // RtSigqueueinfo
 // RtSigreturn
 // RtSigsuspend
 // RtSigtimedwait
 // SchedGetPriorityMax

changeset 265	05c40b36d3b2
parent 262	8d3354485fc3