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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/rseq.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/rseq.h

     1	/* Restartable Sequences Linux x86 architecture header.
     2	   Copyright (C) 2021-2024 Free Software Foundation, Inc.
     3	
     4	   The GNU C Library is free software; you can redistribute it and/or
     5	   modify it under the terms of the GNU Lesser General Public
     6	   License as published by the Free Software Foundation; either
     7	   version 2.1 of the License, or (at your option) any later version.
     8	
     9	   The GNU C Library is distributed in the hope that it will be useful,
    10	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    11	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12	   Lesser General Public License for more details.
    13	
    14	   You should have received a copy of the GNU Lesser General Public
    15	   License along with the GNU C Library; if not, see
    16	   <https://www.gnu.org/licenses/>.  */
    17	
    18	#ifndef _SYS_RSEQ_H
    19	# error "Never use <bits/rseq.h> directly; include <sys/rseq.h> instead."
    20	#endif
    21	
    22	/* RSEQ_SIG is a signature required before each abort handler code.
    23	
    24	   RSEQ_SIG is used with the following reserved undefined instructions, which
    25	   trap in user-space:
    26	
    27	   x86-32:    0f b9 3d 53 30 05 53      ud1    0x53053053,%edi
    28	   x86-64:    0f b9 3d 53 30 05 53      ud1    0x53053053(%rip),%edi  */
    29	
    30	#define RSEQ_SIG        0x53053053