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// Copyright 2018 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package procfs
import (
"fmt"
"os"
"strconv"
"strings"
)
// Namespace represents a single namespace of a process.
type Namespace struct {
Type string // Namespace type.
Inode uint32 // Inode number of the namespace. If two processes are in the same namespace their inodes will match.
}
// Namespaces contains all of the namespaces that the process is contained in.
type Namespaces map[string]Namespace
// Namespaces reads from /proc/<pid>/ns/* to get the namespaces of which the
// process is a member.
func (p Proc) Namespaces() (Namespaces, error) {
d, err := os.Open(p.path("ns"))
if err != nil {
return nil, err
}
defer d.Close()
names, err := d.Readdirnames(-1)
if err != nil {
return nil, fmt.Errorf("%w: failed to read contents of ns dir: %w", ErrFileRead, err)
}
ns := make(Namespaces, len(names))
for _, name := range names {
target, err := os.Readlink(p.path("ns", name))
if err != nil {
return nil, err
}
fields := strings.SplitN(target, ":", 2)
if len(fields) != 2 {
return nil, fmt.Errorf("%w: namespace type and inode from %q", ErrFileParse, target)
}
typ := fields[0]
inode, err := strconv.ParseUint(strings.Trim(fields[1], "[]"), 10, 32)
if err != nil {
return nil, fmt.Errorf("%w: inode from %q: %w", ErrFileParse, fields[1], err)
}
ns[name] = Namespace{typ, uint32(inode)}
}
return ns, nil
}