37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package eventfd
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import (
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// nonBlockingWrite writes the given buffer to a file descriptor. It fails if
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// partial data is written.
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func nonBlockingWrite(fd int, buf []byte) (int, error) {
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var ptr unsafe.Pointer
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if len(buf) > 0 {
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ptr = unsafe.Pointer(&buf[0])
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}
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nwritten, _, errno := unix.RawSyscall(unix.SYS_WRITE, uintptr(fd), uintptr(ptr), uintptr(len(buf)))
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if errno != 0 {
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return int(nwritten), errno
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}
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return int(nwritten), nil
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}
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