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The new specification for vfork where you can't even call dup2 is very close to useless. The origin of vfork and true standard for its behavior that applications have been written for is 4.2BSD, where simple system calls were always safe, and getpid has always been the simplest system call. The modern BSD specification remains that the address space is shared, with all that entails, but since getpid has never relied on data contents in the address space before, citing that as license to make it do the wrong thing is dubious at best. Since the useless specification has been enshrined in POSIX, where vfork in fact never belonged at all, it is likely that every historical program will be broken and people will just have to adapt to giving up vfork entirely. Progress.
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