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* remove __vfork aliasRich Felker2018-09-121-4/+1
| | | | | | | this was added so that posix_spawn and possibly other functionality could be implemented in terms of vfork, but that turned out to be unsafe. any such usage needs __clone with proper handling of stack lifetime.
* declare __syscall_ret as hidden in vfork asmRich Felker2018-09-121-0/+1
| | | | | without this, it's plausible that assembler or linker could complain about an unsatisfiable relocation.
* x86_64 vfork implementationRich Felker2012-02-061-0/+12
untested; should work.