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// Copyright 2019 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package posixtest
import (
"fmt"
"log"
"os"
"runtime"
"strings"
)
// listFds lists the open file descriptors for process "pid". Pass pid=0 for
// ourselves. Pass a prefix to ignore all paths that do not start with "prefix".
//
// Copied from https://github.com/rfjakob/gocryptfs/blob/master/tests/test_helpers/mount_unmount.go#L191
func listFds(pid int, prefix string) []string {
// We need /proc to get the list of fds for other processes. Only exists
// on Linux.
if runtime.GOOS != "linux" && pid > 0 {
return nil
}
// Both Linux and MacOS have /dev/fd
dir := "/dev/fd"
if pid > 0 {
dir = fmt.Sprintf("/proc/%d/fd", pid)
}
f, err := os.Open(dir)
if err != nil {
fmt.Printf("ListFds: %v\n", err)
return nil
}
defer f.Close()
// Note: Readdirnames filters "." and ".."
names, err := f.Readdirnames(0)
if err != nil {
log.Panic(err)
}
var out []string
var filtered []string
for _, n := range names {
fdPath := dir + "/" + n
fi, err := os.Lstat(fdPath)
if err != nil {
// fd was closed in the meantime
continue
}
if fi.Mode()&0400 > 0 {
n += "r"
}
if fi.Mode()&0200 > 0 {
n += "w"
}
target, err := os.Readlink(fdPath)
if err != nil {
// fd was closed in the meantime
continue
}
if strings.HasPrefix(target, "pipe:") || strings.HasPrefix(target, "anon_inode:[eventpoll]") {
// go-fuse creates pipes on demand for splice(), which
// creates spurious test failures. Ignore all pipes.
// Also get rid of the "eventpoll" fd that is always there and not
// interesting.
filtered = append(filtered, target)
continue
}
if prefix != "" && !strings.HasPrefix(target, prefix) {
filtered = append(filtered, target)
continue
}
out = append(out, n+"="+target)
}
out = append(out, fmt.Sprintf("(filtered: %s)", strings.Join(filtered, ", ")))
return out
}
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