| // 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.real}}) |
| } |
| |
| 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.real}}, 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.real} |
| if _, err := os.Stat(tfs.proc.Path(strconv.Itoa(tid))); err != nil { |
| return Proc{}, err |
| } |
| return Proc{PID: tid, fs: tfs}, nil |
| } |