92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build ignore
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// This is a test program that verifies that it can read from
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// descriptor 3 and that no other descriptors are open.
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// This is not done via TestHelperProcess and GO_WANT_HELPER_PROCESS
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// because we want to ensure that this program does not use cgo,
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// because C libraries can open file descriptors behind our backs
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// and confuse the test. See issue 25628.
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package main
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import (
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"fmt"
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"internal/poll"
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"io"
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"os"
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"os/exec"
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"os/exec/internal/fdtest"
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"runtime"
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"strings"
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)
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func main() {
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fd3 := os.NewFile(3, "fd3")
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defer fd3.Close()
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bs, err := io.ReadAll(fd3)
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if err != nil {
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fmt.Printf("ReadAll from fd 3: %v\n", err)
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os.Exit(1)
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}
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// Now verify that there are no other open fds.
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// stdin == 0
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// stdout == 1
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// stderr == 2
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// descriptor from parent == 3
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// All descriptors 4 and up should be available,
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// except for any used by the network poller.
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for fd := uintptr(4); fd <= 100; fd++ {
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if poll.IsPollDescriptor(fd) {
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continue
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}
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if !fdtest.Exists(fd) {
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continue
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}
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fmt.Printf("leaked parent file. fdtest.Exists(%d) got true want false\n", fd)
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fdfile := fmt.Sprintf("/proc/self/fd/%d", fd)
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link, err := os.Readlink(fdfile)
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fmt.Printf("readlink(%q) = %q, %v\n", fdfile, link, err)
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var args []string
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switch runtime.GOOS {
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case "plan9":
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args = []string{fmt.Sprintf("/proc/%d/fd", os.Getpid())}
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case "aix", "solaris", "illumos":
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args = []string{fmt.Sprint(os.Getpid())}
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default:
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args = []string{"-p", fmt.Sprint(os.Getpid())}
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}
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// Determine which command to use to display open files.
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ofcmd := "lsof"
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switch runtime.GOOS {
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case "dragonfly", "freebsd", "netbsd", "openbsd":
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ofcmd = "fstat"
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case "plan9":
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ofcmd = "/bin/cat"
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case "aix":
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ofcmd = "procfiles"
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case "solaris", "illumos":
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ofcmd = "pfiles"
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}
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cmd := exec.Command(ofcmd, args...)
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out, err := cmd.CombinedOutput()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s failed: %v\n", strings.Join(cmd.Args, " "), err)
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}
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fmt.Printf("%s", out)
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os.Exit(1)
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}
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os.Stdout.Write(bs)
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}
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