2019-04-29 21:25:05 +00:00
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// Copyright 2019 The gVisor Authors.
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2019-04-18 22:22:47 +00:00
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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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2019-06-13 23:49:09 +00:00
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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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slinux "gvisor.dev/gvisor/pkg/sentry/syscalls/linux"
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"gvisor.dev/gvisor/pkg/sentry/usermem"
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2019-04-18 22:22:47 +00:00
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)
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// PollEventSet is the set of poll(2) event flags.
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var PollEventSet = abi.FlagSet{
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{Flag: linux.POLLIN, Name: "POLLIN"},
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{Flag: linux.POLLPRI, Name: "POLLPRI"},
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{Flag: linux.POLLOUT, Name: "POLLOUT"},
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{Flag: linux.POLLERR, Name: "POLLERR"},
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{Flag: linux.POLLHUP, Name: "POLLHUP"},
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{Flag: linux.POLLNVAL, Name: "POLLNVAL"},
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{Flag: linux.POLLRDNORM, Name: "POLLRDNORM"},
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{Flag: linux.POLLRDBAND, Name: "POLLRDBAND"},
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{Flag: linux.POLLWRNORM, Name: "POLLWRNORM"},
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{Flag: linux.POLLWRBAND, Name: "POLLWRBAND"},
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{Flag: linux.POLLMSG, Name: "POLLMSG"},
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{Flag: linux.POLLREMOVE, Name: "POLLREMOVE"},
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{Flag: linux.POLLRDHUP, Name: "POLLRDHUP"},
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{Flag: linux.POLLFREE, Name: "POLLFREE"},
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{Flag: linux.POLL_BUSY_LOOP, Name: "POLL_BUSY_LOOP"},
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}
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func pollFD(t *kernel.Task, pfd *linux.PollFD, post bool) string {
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revents := "..."
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if post {
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revents = PollEventSet.Parse(uint64(pfd.REvents))
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}
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2019-07-03 02:27:51 +00:00
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return fmt.Sprintf("{FD: %s, Events: %s, REvents: %s}", fd(t, pfd.FD), PollEventSet.Parse(uint64(pfd.Events)), revents)
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2019-04-18 22:22:47 +00:00
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}
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func pollFDs(t *kernel.Task, addr usermem.Addr, nfds uint, post bool) string {
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if addr == 0 {
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return "null"
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}
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pfds, err := slinux.CopyInPollFDs(t, addr, nfds)
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if err != nil {
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return fmt.Sprintf("%#x (error decoding pollfds: %s)", addr, err)
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}
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s := make([]string, 0, len(pfds))
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for i := range pfds {
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s = append(s, pollFD(t, &pfds[i], post))
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}
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return fmt.Sprintf("%#x [%s]", addr, strings.Join(s, ", "))
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}
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