80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
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// Copyright 2009 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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//go:build aix || darwin || dragonfly || freebsd || hurd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
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package poll
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import (
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"io"
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"syscall"
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)
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// eofError returns io.EOF when fd is available for reading end of
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// file.
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func (fd *FD) eofError(n int, err error) error {
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if n == 0 && err == nil && fd.ZeroReadIsEOF {
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return io.EOF
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}
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return err
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}
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// Shutdown wraps syscall.Shutdown.
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func (fd *FD) Shutdown(how int) error {
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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return syscall.Shutdown(fd.Sysfd, how)
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}
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// Fchown wraps syscall.Fchown.
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func (fd *FD) Fchown(uid, gid int) error {
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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return ignoringEINTR(func() error {
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return syscall.Fchown(fd.Sysfd, uid, gid)
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})
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}
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// Ftruncate wraps syscall.Ftruncate.
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func (fd *FD) Ftruncate(size int64) error {
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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return ignoringEINTR(func() error {
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return syscall.Ftruncate(fd.Sysfd, size)
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})
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}
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// RawControl invokes the user-defined function f for a non-IO
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// operation.
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func (fd *FD) RawControl(f func(uintptr)) error {
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if err := fd.incref(); err != nil {
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return err
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}
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defer fd.decref()
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f(uintptr(fd.Sysfd))
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return nil
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}
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// ignoringEINTR makes a function call and repeats it if it returns
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// an EINTR error. This appears to be required even though we install all
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// signal handlers with SA_RESTART: see #22838, #38033, #38836, #40846.
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// Also #20400 and #36644 are issues in which a signal handler is
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// installed without setting SA_RESTART. None of these are the common case,
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// but there are enough of them that it seems that we can't avoid
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// an EINTR loop.
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func ignoringEINTR(fn func() error) error {
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for {
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err := fn()
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if err != syscall.EINTR {
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return err
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}
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}
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}
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