1 // 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
6 // http://www.apache.org/licenses/LICENSE-2.0
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.
22 // ProcIO models the content of /proc/<pid>/io.
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
42 // NewIO creates a new ProcIO instance from a given Proc instance.
43 func (p Proc) NewIO() (ProcIO, error) {
46 f, err := os.Open(p.path("io"))
52 data, err := ioutil.ReadAll(f)
57 ioFormat := "rchar: %d\nwchar: %d\nsyscr: %d\nsyscw: %d\n" +
58 "read_bytes: %d\nwrite_bytes: %d\n" +
59 "cancelled_write_bytes: %d\n"
61 _, err = fmt.Sscanf(string(data), ioFormat, &pio.RChar, &pio.WChar, &pio.SyscR,
62 &pio.SyscW, &pio.ReadBytes, &pio.WriteBytes, &pio.CancelledWriteBytes)