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2018-09-12remove __vfork aliasRich Felker1-4/+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.
2018-09-12declare __syscall_ret as hidden in vfork asmRich Felker1-0/+1
without this, it's plausible that assembler or linker could complain about an unsatisfiable relocation.
2012-02-06x86_64 vfork implementationRich Felker1-0/+12
untested; should work.