rb_fork_ruby     1295 internal.h     rb_pid_t rb_fork_ruby(int *status);
rb_fork_ruby     6021 io.c           	pid = rb_fork_ruby(&status);
rb_fork_ruby     3718 process.c          switch (pid = rb_fork_ruby(NULL)) {
rb_fork_ruby     6048 process.c          switch (rb_fork_ruby(NULL)) { \