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Etienne PerotandgVisor bot
8a2e720b0d
`//pkg/tcpip/link/rawfile` is a package to deal with raw socket and file FDs. It is not only used for Netstack, but rather just generally useful raw file manipulation stuff. This change removes the Unix-error-to-`//pkg/tcpip`-error translation step from its functions; this is now the responsibility of its callers. Callers within Netstack now do the translation by themselves; the translation function is moved to `//pkg/tcpip`. This allows the `//pkg/tcpip/link/rawfile` package to not depend on `//pkg/tcpip`, which in turn means the `//pkg/eventfd` package (which depends on `rawfile`) no longer transitively depends on `//pkg/tcpip`, which in turns means the `//pkg/unet` package (which depends on `//pkg/eventfd`) no longer transitively depends on `//pkg/tcpip`, which in turns means that the `//pkg/eventchannel` package (which depends on `//pkg/unet`) no longer transitively depends on `//pkg/tcpip`, which in turns means that the `//pkg/metric` package (which depends on `//pkg/eventchannel`) no longer transitively depends on `//pkg/tcpip`, which finally means that the `//pkg/metric` package can be used within `//pkg/tcpip`. \o/ This changes does not make it use it, it just moves `rawfile`. PiperOrigin-RevId: 647943618
70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
// Copyright 2018 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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//go:build ((linux && amd64) || (linux && arm64)) && go1.18
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// +build linux,amd64 linux,arm64
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// +build go1.18
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// //go:linkname directives type-checked by checklinkname. Any other
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// non-linkname assumptions outside the Go 1 compatibility guarantee should
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// have an accompanied vet check or version guard build tag.
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package rawfile
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import (
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_ "unsafe" // for go:linkname
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"golang.org/x/sys/unix"
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)
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// BlockingPoll on amd64/arm64 makes the ppoll() syscall while calling the
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// version of entersyscall that relinquishes the P so that other Gs can
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// run. This is meant to be called in cases when the syscall is expected to
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// block. On non amd64/arm64 platforms it just forwards to the ppoll() system
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// call.
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//
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//go:noescape
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func BlockingPoll(fds *PollEvent, nfds int, timeout *unix.Timespec) (int, unix.Errno)
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// Use go:linkname to call into the runtime. As of Go 1.13 this has to
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// be done from Go code so that we make an ABIInternal call to an
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// ABIInternal function; see https://golang.org/issue/27539.
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// We need to call both entersyscallblock and exitsyscall this way so
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// that the runtime's check on the stack pointer lines up.
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// Note that calling an unexported function in the runtime package is
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// unsafe and this hack is likely to break in future Go releases.
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//go:linkname entersyscallblock runtime.entersyscallblock
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func entersyscallblock()
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//go:linkname exitsyscall runtime.exitsyscall
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func exitsyscall()
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// These forwarding functions must be nosplit because 1) we must
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// disallow preemption between entersyscallblock and exitsyscall, and
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// 2) we have an untyped assembly frame on the stack which can not be
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// grown or moved.
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//go:nosplit
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func callEntersyscallblock() {
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entersyscallblock()
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}
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//go:nosplit
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func callExitsyscall() {
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exitsyscall()
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}
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