The could be calling fork() as in the system call - which copies all file
descriptors but I didn’t think Go processes could fork.
Seems you would need to remap stdin and stdout in the fork to do anything
useful.
This sounds very PHP - what goes around comes around.
> On Mar 1, 2024, at 8:01 PM, Ian Lance Taylor <i...@golang.org> wrote:
>
> On Fri, Mar 1, 2024 at 5:57 PM Jeff Stein <jeffst...@gmail.com> wrote:
>>
>> I'm struggling to understand if I'm able to do something.
>>
>>
>> In my very odd use case we are writing a websever that handles connections
>> via a forked process.
>>
>> I have a listener process that listens for TCP connections.
>>
>> So each net.Conn that comes in we pull off its file descriptor:
>>
>> fd, err := conn.(*net.TCPConn).File()
>>
>> duplicate that file descriptor and then fork off a process passing in that
>> file descriptor.
>>
>> In my forked handler I'll reconstruct the HTTP connection and "do stuff".
>>
>> The concern I'm having is that it appears when I fork a process I inherit
>> all of the parent file descriptors so if I have say 5 incoming connections
>> and then I fork my child process technically could write to a different
>> connection.
>>
>> I've played around with the various options:
>>
>> cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: false,}
>>
>> and using cmd.ExtraFiles
>>
>> No matter what I do I seem unable to limit the sub process to ONLY using the
>> specific File Descriptor I want it to have access to.
>>
>> I believe this is doable in C - but I'm not sure if I can do this in GoLang
>> as-is without mods .
>
> What you are describing shouldn't happen. A child process should only
> get the file descriptors explicitly passed via the os/exec.Cmd fields
> Stdin, Stdout, Stderr, and ExtraFiles. So tell us more: OS and
> version of Go, and what is showing you that all file descriptors are
> being passed down to the child.
>
> Ian
>
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