6436a4abd7
Switch gofrontend to using go.googlesource.com, and update to 81eb6a3f425b2158c67ee32c0cc973a72ce9d6be. There are various changes required to update to the go 1.5 runtime: typemap.go is changed to accommodate the change in representation for equal/hash algorithms, and the removal of the zero value/type. CMakeLists.txt is updated to add the build tree to the package search path, so internal packages, which are not installed, are found. various files changes due to removal of __go_new_nopointers; the same change as in D11863, but with NoUnwindAttribute added to the added runtime functions which are called with "callOnly". minor cleanups in ssa.go while investigating issues with unwinding/panic handling. Differential Revisision: http://reviews.llvm.org/D15188 llvm-svn: 263536
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
// Copyright 2011 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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package net
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import (
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"io"
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"os"
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"syscall"
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)
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// maxSendfileSize is the largest chunk size we ask the kernel to copy
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// at a time.
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const maxSendfileSize int = 4 << 20
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// sendFile copies the contents of r to c using the sendfile
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// system call to minimize copies.
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//
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// if handled == true, sendFile returns the number of bytes copied and any
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// non-EOF error.
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//
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// if handled == false, sendFile performed no work.
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func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
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var remain int64 = 1 << 62 // by default, copy until EOF
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lr, ok := r.(*io.LimitedReader)
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if ok {
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remain, r = lr.N, lr.R
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if remain <= 0 {
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return 0, nil, true
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}
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}
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f, ok := r.(*os.File)
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if !ok {
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return 0, nil, false
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}
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if err := c.writeLock(); err != nil {
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return 0, err, true
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}
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defer c.writeUnlock()
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dst := c.sysfd
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src := int(f.Fd())
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for remain > 0 {
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n := maxSendfileSize
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if int64(n) > remain {
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n = int(remain)
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}
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n, err1 := syscall.Sendfile(dst, src, nil, n)
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if n > 0 {
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written += int64(n)
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remain -= int64(n)
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}
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if n == 0 && err1 == nil {
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break
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}
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if err1 == syscall.EAGAIN {
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if err1 = c.pd.WaitWrite(); err1 == nil {
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continue
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}
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}
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if err1 != nil {
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// This includes syscall.ENOSYS (no kernel
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// support) and syscall.EINVAL (fd types which
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// don't implement sendfile)
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err = err1
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break
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}
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}
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if lr != nil {
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lr.N = remain
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}
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if err != nil {
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err = os.NewSyscallError("sendfile", err)
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}
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return written, err, written > 0
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}
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