forked from toolshed/abra
81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
// Copyright 2022 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"fmt"
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"os"
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"strconv"
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fsi "github.com/prometheus/procfs/internal/fs"
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)
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// Provide access to /proc/PID/task/TID files, for thread specific values. Since
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// such files have the same structure as /proc/PID/ ones, the data structures
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// and the parsers for the latter may be reused.
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// AllThreads returns a list of all currently available threads under /proc/PID.
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func AllThreads(pid int) (Procs, error) {
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fs, err := NewFS(DefaultMountPoint)
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if err != nil {
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return Procs{}, err
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}
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return fs.AllThreads(pid)
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}
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// AllThreads returns a list of all currently available threads for PID.
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func (fs FS) AllThreads(pid int) (Procs, error) {
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taskPath := fs.proc.Path(strconv.Itoa(pid), "task")
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d, err := os.Open(taskPath)
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if err != nil {
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return Procs{}, err
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}
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defer d.Close()
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names, err := d.Readdirnames(-1)
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if err != nil {
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return Procs{}, fmt.Errorf("%w: could not read %q: %w", ErrFileRead, d.Name(), err)
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}
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t := Procs{}
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for _, n := range names {
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tid, err := strconv.ParseInt(n, 10, 64)
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if err != nil {
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continue
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}
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t = append(t, Proc{PID: int(tid), fs: FS{fsi.FS(taskPath), fs.isReal}})
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}
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return t, nil
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}
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// Thread returns a process for a given PID, TID.
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func (fs FS) Thread(pid, tid int) (Proc, error) {
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taskPath := fs.proc.Path(strconv.Itoa(pid), "task")
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if _, err := os.Stat(taskPath); err != nil {
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return Proc{}, err
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}
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return Proc{PID: tid, fs: FS{fsi.FS(taskPath), fs.isReal}}, nil
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}
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// Thread returns a process for a given TID of Proc.
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func (proc Proc) Thread(tid int) (Proc, error) {
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tfs := FS{fsi.FS(proc.path("task")), proc.fs.isReal}
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if _, err := os.Stat(tfs.proc.Path(strconv.Itoa(tid))); err != nil {
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return Proc{}, err
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}
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return Proc{PID: tid, fs: tfs}, nil
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}
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