/usr/include/ruby-2.0.0/ruby/backward/rubysig.h is in ruby2.0-dev 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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rubysig.h -
$Author$
$Date$
created at: Wed Aug 16 01:15:38 JST 1995
Copyright (C) 1993-2008 Yukihiro Matsumoto
**********************************************************************/
#if defined __GNUC__
#warning rubysig.h is obsolete
#elif defined _MSC_VER || defined __BORLANDC__
#pragma message("warning: rubysig.h is obsolete")
#endif
#ifndef RUBYSIG_H
#define RUBYSIG_H
#include "ruby/ruby.h"
#if defined(__cplusplus)
extern "C" {
#if 0
} /* satisfy cc-mode */
#endif
#endif
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility push(default)
#endif
struct rb_blocking_region_buffer;
DEPRECATED(RUBY_EXTERN struct rb_blocking_region_buffer *rb_thread_blocking_region_begin(void));
DEPRECATED(RUBY_EXTERN void rb_thread_blocking_region_end(struct rb_blocking_region_buffer *));
#define TRAP_BEG do {struct rb_blocking_region_buffer *__region = rb_thread_blocking_region_begin();
#define TRAP_END rb_thread_blocking_region_end(__region);} while (0)
#define RUBY_CRITICAL(statements) do {statements;} while (0)
#define DEFER_INTS (0)
#define ENABLE_INTS (1)
#define ALLOW_INTS do {CHECK_INTS;} while (0)
#define CHECK_INTS rb_thread_check_ints()
#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility pop
#endif
#if defined(__cplusplus)
#if 0
{ /* satisfy cc-mode */
#endif
} /* extern "C" { */
#endif
#endif
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