How to Identify and Handle Broken Pipe Errors in Go?

Determining Broken Pipe Errors in Go

When performing IO operations involving sockets, it's common to encounter broken pipe errors. These errors indicate that the remote host has dropped the connection, leading to a "write" operation failing.

If you're receiving an error from an io.Copy call that involves a socket as the destination, you may encounter the following error message:

"write tcp 192.168.26.5:21277: broken pipe"

To differentiate broken pipe errors from other types of errors, you can utilize the Go syscall package. The syscall.EPIPE constant denotes the broken pipe error. You can compare your error to syscall.EPIPE using the equality operator:

<code class="go">if err == syscall.EPIPE {
    // Ignore the error since it's a broken pipe
}</code>

Alternatively, you can perform a type assertion on the error to obtain the actual error number:

<code class="go">if e, ok := err.(syscall.Errno); ok {
    errno = uintptr(e)
}</code>

This approach allows you to work with the error number directly, although its usefulness is limited in most cases. By filtering out broken pipe errors, you can handle them appropriately and ensure that your application doesn't crash due to unexpected connection drops.

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