Bryan Boreham
35c017a787
It's sad because this changes a regular pattern into an irregular one, which will create spurious diffs if more work is added at the end of the function. Still, this is easier than fixing the lint runner to ignore the report.
44 lines
980 B
Go
44 lines
980 B
Go
package net
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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)
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// Configure the ARP cache parameters for the given interface. This
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// makes containers react more quickly to a change in the MAC address
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// associated with an IP address.
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func ConfigureARPCache(procPath, name string) error {
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if err := sysctl(procPath, fmt.Sprintf("net/ipv4/neigh/%s/base_reachable_time", name), "5"); err != nil {
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return err
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}
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if err := sysctl(procPath, fmt.Sprintf("net/ipv4/neigh/%s/delay_first_probe_time", name), "2"); err != nil {
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return err
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}
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return sysctl(procPath, fmt.Sprintf("net/ipv4/neigh/%s/ucast_solicit", name), "1")
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}
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func sysctl(procPath, variable, value string) error {
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f, err := os.OpenFile(filepath.Join(procPath, "/sys/", variable), os.O_WRONLY, 0)
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if err != nil {
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return err
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}
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n, err := io.WriteString(f, value)
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if err != nil {
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return err
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}
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if n < len(value) {
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return io.ErrShortWrite
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}
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err = f.Close()
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if err != nil {
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return err
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}
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return nil
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}
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