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// 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
}
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