/usr/include/ruby-1.9.1/ruby/vm.h is in ruby1.9.1-dev 1.9.3.194-8.1+deb7u5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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ruby/vm.h -
$Author: shyouhei $
created at: Sat May 31 15:17:36 2008
Copyright (C) 2008 Yukihiro Matsumoto
**********************************************************************/
#ifndef RUBY_VM_H
#define RUBY_VM_H 1
#if defined(__cplusplus)
extern "C" {
#if 0
} /* satisfy cc-mode */
#endif
#endif
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility push(default)
#endif
/* Place holder.
*
* We will prepare VM creation/control APIs on 1.9.2 or later.
* If you have an interest about it, please see mvm branch.
* http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/mvm/
*/
/* VM type declaration */
typedef struct rb_vm_struct ruby_vm_t;
/* core API */
int ruby_vm_destruct(ruby_vm_t *vm);
/**
* ruby_vm_at_exit registers a function _func_ to be invoked when a VM
* passed away. Functions registered this way runs in reverse order
* of registration, just like END {} block does. The difference is
* its timing to be triggered. ruby_vm_at_exit functions runs when a
* VM _passed_ _away_, while END {} blocks runs just _before_ a VM
* _is_ _passing_ _away_.
*
* You cannot register a function to another VM than where you are in.
* So where to register is intuitive, omitted. OTOH the argument
* _func_ cannot know which VM it is in because at the time of
* invocation, the VM has already died and there is no execution
* context. The VM itself is passed as the first argument to it.
*
* @param[in] func the function to register.
*/
void ruby_vm_at_exit(void(*func)(ruby_vm_t *));
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility pop
#endif
#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */
#endif
} /* extern "C" { */
#endif
#endif /* RUBY_VM_H */
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