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Date: Tue, 13 Oct 2020 18:48:41 +0300
From: Alexey Izbyshev <>
Subject: Re: Calling setxid() in a vfork()-child

On 2020-10-13 12:52, Laurent Bercot wrote:
>  This is one of process state change operations that are lacking in
> posix_spawn(), along with being able to spawn the child as a session
> leader (despite being able to spawn it as a process group leader).
Thankfully, POSIX_SPAWN_SETSID was accepted into POSIX[1] and is 
available in recent enough musl and glibc (and I also heard some rumors 
about macOS).

But yes, even if we accept that simply setting some attributes for a new 
process is enough (as opposed to running more complex logic requiring an 
already created process, which is possible with fork()), having a fixed 
of them for an evolving entity is problematic, more so since on Linux 
posix_spawn() implementations are developed separately from the kernel.


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