blob: 776f34971730d5d210b567df2e46fdb3f1b12d5d [file] [log] [blame]
khenaidoo59ce9dd2019-11-11 13:05:32 -05001// Copyright 2018 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14package procfs
15
16import (
17 "fmt"
khenaidoo26721882021-08-11 17:42:52 -040018
19 "github.com/prometheus/procfs/internal/util"
khenaidoo59ce9dd2019-11-11 13:05:32 -050020)
21
22// ProcIO models the content of /proc/<pid>/io.
23type ProcIO struct {
24 // Chars read.
25 RChar uint64
26 // Chars written.
27 WChar uint64
28 // Read syscalls.
29 SyscR uint64
30 // Write syscalls.
31 SyscW uint64
32 // Bytes read.
33 ReadBytes uint64
34 // Bytes written.
35 WriteBytes uint64
36 // Bytes written, but taking into account truncation. See
37 // Documentation/filesystems/proc.txt in the kernel sources for
38 // detailed explanation.
39 CancelledWriteBytes int64
40}
41
42// IO creates a new ProcIO instance from a given Proc instance.
43func (p Proc) IO() (ProcIO, error) {
44 pio := ProcIO{}
45
khenaidoo26721882021-08-11 17:42:52 -040046 data, err := util.ReadFileNoStat(p.path("io"))
khenaidoo59ce9dd2019-11-11 13:05:32 -050047 if err != nil {
48 return pio, err
49 }
50
51 ioFormat := "rchar: %d\nwchar: %d\nsyscr: %d\nsyscw: %d\n" +
52 "read_bytes: %d\nwrite_bytes: %d\n" +
53 "cancelled_write_bytes: %d\n"
54
55 _, err = fmt.Sscanf(string(data), ioFormat, &pio.RChar, &pio.WChar, &pio.SyscR,
56 &pio.SyscW, &pio.ReadBytes, &pio.WriteBytes, &pio.CancelledWriteBytes)
57
58 return pio, err
59}