| // Copyright 2018 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" |
| "io/ioutil" |
| "os" |
| ) |
| |
| // ProcIO models the content of /proc/<pid>/io. |
| type ProcIO struct { |
| // Chars read. |
| RChar uint64 |
| // Chars written. |
| WChar uint64 |
| // Read syscalls. |
| SyscR uint64 |
| // Write syscalls. |
| SyscW uint64 |
| // Bytes read. |
| ReadBytes uint64 |
| // Bytes written. |
| WriteBytes uint64 |
| // Bytes written, but taking into account truncation. See |
| // Documentation/filesystems/proc.txt in the kernel sources for |
| // detailed explanation. |
| CancelledWriteBytes int64 |
| } |
| |
| // NewIO creates a new ProcIO instance from a given Proc instance. |
| func (p Proc) NewIO() (ProcIO, error) { |
| pio := ProcIO{} |
| |
| f, err := os.Open(p.path("io")) |
| if err != nil { |
| return pio, err |
| } |
| defer f.Close() |
| |
| data, err := ioutil.ReadAll(f) |
| if err != nil { |
| return pio, err |
| } |
| |
| ioFormat := "rchar: %d\nwchar: %d\nsyscr: %d\nsyscw: %d\n" + |
| "read_bytes: %d\nwrite_bytes: %d\n" + |
| "cancelled_write_bytes: %d\n" |
| |
| _, err = fmt.Sscanf(string(data), ioFormat, &pio.RChar, &pio.WChar, &pio.SyscR, |
| &pio.SyscW, &pio.ReadBytes, &pio.WriteBytes, &pio.CancelledWriteBytes) |
| |
| return pio, err |
| } |