81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
// Copyright 2022 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"
|
|
|
|
fsi "github.com/prometheus/procfs/internal/fs"
|
|
)
|
|
|
|
// Provide access to /proc/PID/task/TID files, for thread specific values. Since
|
|
// such files have the same structure as /proc/PID/ ones, the data structures
|
|
// and the parsers for the latter may be reused.
|
|
|
|
// AllThreads returns a list of all currently available threads under /proc/PID.
|
|
func AllThreads(pid int) (Procs, error) {
|
|
fs, err := NewFS(DefaultMountPoint)
|
|
if err != nil {
|
|
return Procs{}, err
|
|
}
|
|
return fs.AllThreads(pid)
|
|
}
|
|
|
|
// AllThreads returns a list of all currently available threads for PID.
|
|
func (fs FS) AllThreads(pid int) (Procs, error) {
|
|
taskPath := fs.proc.Path(strconv.Itoa(pid), "task")
|
|
d, err := os.Open(taskPath)
|
|
if err != nil {
|
|
return Procs{}, err
|
|
}
|
|
defer d.Close()
|
|
|
|
names, err := d.Readdirnames(-1)
|
|
if err != nil {
|
|
return Procs{}, fmt.Errorf("%s: could not read %q: %w", ErrFileRead, d.Name(), err)
|
|
}
|
|
|
|
t := Procs{}
|
|
for _, n := range names {
|
|
tid, err := strconv.ParseInt(n, 10, 64)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
t = append(t, Proc{PID: int(tid), fs: FS{fsi.FS(taskPath), fs.isReal}})
|
|
}
|
|
|
|
return t, nil
|
|
}
|
|
|
|
// Thread returns a process for a given PID, TID.
|
|
func (fs FS) Thread(pid, tid int) (Proc, error) {
|
|
taskPath := fs.proc.Path(strconv.Itoa(pid), "task")
|
|
if _, err := os.Stat(taskPath); err != nil {
|
|
return Proc{}, err
|
|
}
|
|
return Proc{PID: tid, fs: FS{fsi.FS(taskPath), fs.isReal}}, nil
|
|
}
|
|
|
|
// Thread returns a process for a given TID of Proc.
|
|
func (proc Proc) Thread(tid int) (Proc, error) {
|
|
tfs := FS{fsi.FS(proc.path("task")), proc.fs.isReal}
|
|
if _, err := os.Stat(tfs.proc.Path(strconv.Itoa(tid))); err != nil {
|
|
return Proc{}, err
|
|
}
|
|
return Proc{PID: tid, fs: tfs}, nil
|
|
}
|