Unit Instance

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        "The syscall itself proceeds by setting corresponding flags depending on the flags passed in. For example, <literal>CLONE_VM</literal> maps to RFMEM (sharing of VM), etc. The only nit here is <literal>CLONE_FS</literal> and <literal>CLONE_FILES</literal> because FreeBSD does not allow setting this separately so we fake it by not setting RFFDG (copying of fd table and other fs information) if either of these is defined. This does not cause any problems, because those flags are always set together. After setting the flags the process is forked using the internal <function>fork1</function> routine, the process is instrumented not to be put on a run queue, i.e. not to be set runnable. After the forking is done we possibly reparent the newly created process to emulate <literal>CLONE_PARENT</literal> semantics. Next part is creating the emulation data. Threads in <trademark class=\"registered\">Linux</trademark> does not signal their parents so we set exit signal to be 0 to disable this. After that setting of <varname>child_set_tid</varname> and <varname>child_clear_tid</varname> is performed enabling the functionality later in the code. At this point we copy out the PID to the address specified by <varname>parent_tidptr</varname>. The setting of process stack is done by simply rewriting thread frame <varname>%esp</varname> register (<varname>%rsp</varname> on amd64). Next part is setting up TLS for the newly created process. After this <citerefentry><refentrytitle>vfork</refentrytitle><manvolnum>2</manvolnum></citerefentry> semantics might be emulated and finally the newly created process is put on a run queue and copying out its PID to the parent process via <function>clone</function> return value is done."
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        "The syscall itself proceeds by setting corresponding flags depending on the flags passed in. For example, <literal>CLONE_VM</literal> maps to RFMEM (sharing of VM), etc. The only nit here is <literal>CLONE_FS</literal> and <literal>CLONE_FILES</literal> because FreeBSD does not allow setting this separately so we fake it by not setting RFFDG (copying of fd table and other fs information) if either of these is defined. This does not cause any problems, because those flags are always set together. After setting the flags the process is forked using the internal <function>fork1</function> routine, the process is instrumented not to be put on a run queue, i.e. not to be set runnable. After the forking is done we possibly reparent the newly created process to emulate <literal>CLONE_PARENT</literal> semantics. Next part is creating the emulation data. Threads in <trademark class=\"registered\">Linux</trademark> does not signal their parents so we set exit signal to be 0 to disable this. After that setting of <varname>child_set_tid</varname> and <varname>child_clear_tid</varname> is performed enabling the functionality later in the code. At this point we copy out the PID to the address specified by <varname>parent_tidptr</varname>. The setting of process stack is done by simply rewriting thread frame <varname>%esp</varname> register (<varname>%rsp</varname> on amd64). Next part is setting up TLS for the newly created process. After this <citerefentry><refentrytitle>vfork</refentrytitle><manvolnum>2</manvolnum></citerefentry> semantics might be emulated and finally the newly created process is put on a run queue and copying out its PID to the parent process via <function>clone</function> return value is done."
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