If you're going to go down this path, would you mind making it depend
upon the contents of an environment variable?
Ie, DO_SH_VFORK="yes|no"
Then debugging can occur without having to recompile sh.
I ask simply because I've been down this path before in other
projects, and trying to debug vfork(
The below patch changes sh to use vfork(2) instead of fork(2) in some
simple cases: a foreground simple command, not being a command
substitution, without redirections or assignments in a non-interactive
shell with job control disabled.
By restricting the use of vfork, different from what NetBSD h
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