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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:19:13 +0000 |
commit | ccd992355df7192993c666236047820244914598 (patch) | |
tree | f00fea65147227b7743083c6148396f74cd66935 /src/internal/poll/fd.go | |
parent | Initial commit. (diff) | |
download | golang-1.21-ccd992355df7192993c666236047820244914598.tar.xz golang-1.21-ccd992355df7192993c666236047820244914598.zip |
Adding upstream version 1.21.8.upstream/1.21.8
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/internal/poll/fd.go')
-rw-r--r-- | src/internal/poll/fd.go | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/internal/poll/fd.go b/src/internal/poll/fd.go new file mode 100644 index 0000000..ef61d0c --- /dev/null +++ b/src/internal/poll/fd.go @@ -0,0 +1,83 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package poll supports non-blocking I/O on file descriptors with polling. +// This supports I/O operations that block only a goroutine, not a thread. +// This is used by the net and os packages. +// It uses a poller built into the runtime, with support from the +// runtime scheduler. +package poll + +import ( + "errors" +) + +// errNetClosing is the type of the variable ErrNetClosing. +// This is used to implement the net.Error interface. +type errNetClosing struct{} + +// Error returns the error message for ErrNetClosing. +// Keep this string consistent because of issue #4373: +// since historically programs have not been able to detect +// this error, they look for the string. +func (e errNetClosing) Error() string { return "use of closed network connection" } + +func (e errNetClosing) Timeout() bool { return false } +func (e errNetClosing) Temporary() bool { return false } + +// ErrNetClosing is returned when a network descriptor is used after +// it has been closed. +var ErrNetClosing = errNetClosing{} + +// ErrFileClosing is returned when a file descriptor is used after it +// has been closed. +var ErrFileClosing = errors.New("use of closed file") + +// ErrNoDeadline is returned when a request is made to set a deadline +// on a file type that does not use the poller. +var ErrNoDeadline = errors.New("file type does not support deadline") + +// Return the appropriate closing error based on isFile. +func errClosing(isFile bool) error { + if isFile { + return ErrFileClosing + } + return ErrNetClosing +} + +// ErrDeadlineExceeded is returned for an expired deadline. +// This is exported by the os package as os.ErrDeadlineExceeded. +var ErrDeadlineExceeded error = &DeadlineExceededError{} + +// DeadlineExceededError is returned for an expired deadline. +type DeadlineExceededError struct{} + +// Implement the net.Error interface. +// The string is "i/o timeout" because that is what was returned +// by earlier Go versions. Changing it may break programs that +// match on error strings. +func (e *DeadlineExceededError) Error() string { return "i/o timeout" } +func (e *DeadlineExceededError) Timeout() bool { return true } +func (e *DeadlineExceededError) Temporary() bool { return true } + +// ErrNotPollable is returned when the file or socket is not suitable +// for event notification. +var ErrNotPollable = errors.New("not pollable") + +// consume removes data from a slice of byte slices, for writev. +func consume(v *[][]byte, n int64) { + for len(*v) > 0 { + ln0 := int64(len((*v)[0])) + if ln0 > n { + (*v)[0] = (*v)[0][n:] + return + } + n -= ln0 + (*v)[0] = nil + *v = (*v)[1:] + } +} + +// TestHookDidWritev is a hook for testing writev. +var TestHookDidWritev = func(wrote int) {} |