90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
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// Copyright 2020 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 strace
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import (
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"fmt"
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"strings"
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"gvisor.dev/gvisor/pkg/abi"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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func epollEvent(t *kernel.Task, eventAddr usermem.Addr) string {
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var e linux.EpollEvent
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if _, err := t.CopyIn(eventAddr, &e); err != nil {
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return fmt.Sprintf("%#x {error reading event: %v}", eventAddr, err)
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}
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var sb strings.Builder
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fmt.Fprintf(&sb, "%#x ", eventAddr)
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writeEpollEvent(&sb, e)
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return sb.String()
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}
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func epollEvents(t *kernel.Task, eventsAddr usermem.Addr, numEvents, maxBytes uint64) string {
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var sb strings.Builder
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fmt.Fprintf(&sb, "%#x {", eventsAddr)
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addr := eventsAddr
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for i := uint64(0); i < numEvents; i++ {
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var e linux.EpollEvent
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if _, err := t.CopyIn(addr, &e); err != nil {
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fmt.Fprintf(&sb, "{error reading event at %#x: %v}", addr, err)
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continue
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}
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writeEpollEvent(&sb, e)
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if uint64(sb.Len()) >= maxBytes {
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sb.WriteString("...")
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break
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}
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if _, ok := addr.AddLength(uint64(linux.SizeOfEpollEvent)); !ok {
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fmt.Fprintf(&sb, "{error reading event at %#x: EFAULT}", addr)
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continue
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}
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}
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sb.WriteString("}")
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return sb.String()
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}
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func writeEpollEvent(sb *strings.Builder, e linux.EpollEvent) {
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events := epollEventEvents.Parse(uint64(e.Events))
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fmt.Fprintf(sb, "{events=%s data=[%#x, %#x]}", events, e.Data[0], e.Data[1])
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}
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var epollCtlOps = abi.ValueSet{
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linux.EPOLL_CTL_ADD: "EPOLL_CTL_ADD",
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linux.EPOLL_CTL_DEL: "EPOLL_CTL_DEL",
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linux.EPOLL_CTL_MOD: "EPOLL_CTL_MOD",
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}
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var epollEventEvents = abi.FlagSet{
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{Flag: linux.EPOLLIN, Name: "EPOLLIN"},
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{Flag: linux.EPOLLPRI, Name: "EPOLLPRI"},
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{Flag: linux.EPOLLOUT, Name: "EPOLLOUT"},
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{Flag: linux.EPOLLERR, Name: "EPOLLERR"},
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{Flag: linux.EPOLLHUP, Name: "EPULLHUP"},
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{Flag: linux.EPOLLRDNORM, Name: "EPOLLRDNORM"},
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{Flag: linux.EPOLLRDBAND, Name: "EPOLLRDBAND"},
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{Flag: linux.EPOLLWRNORM, Name: "EPOLLWRNORM"},
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{Flag: linux.EPOLLWRBAND, Name: "EPOLLWRBAND"},
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{Flag: linux.EPOLLMSG, Name: "EPOLLMSG"},
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{Flag: linux.EPOLLRDHUP, Name: "EPOLLRDHUP"},
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{Flag: linux.EPOLLEXCLUSIVE, Name: "EPOLLEXCLUSIVE"},
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{Flag: linux.EPOLLWAKEUP, Name: "EPOLLWAKEUP"},
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{Flag: linux.EPOLLONESHOT, Name: "EPOLLONESHOT"},
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{Flag: linux.EPOLLET, Name: "EPOLLET"},
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}
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