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