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The C and C++ Include Header Files

cat -n /usr/include/setjmp.h

     1	/* Copyright (C) 1991-2026 Free Software Foundation, Inc.
     2	   This file is part of the GNU C Library.
     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	/*
    19	 *	ISO C99 Standard: 7.13 Nonlocal jumps	<setjmp.h>
    20	 */
    21	
    22	#ifndef	_SETJMP_H
    23	#define	_SETJMP_H	1
    24	
    25	#include <features.h>
    26	
    27	__BEGIN_DECLS
    28	
    29	#if __GLIBC_USE (ISOC23)
    30	# define __STDC_VERSION_SETJMP_H__ 202311L
    31	#endif
    32	
    33	#include <bits/setjmp.h>		/* Get `__jmp_buf'.  */
    34	#include <bits/types/struct___jmp_buf_tag.h>
    35	
    36	typedef struct __jmp_buf_tag jmp_buf[1];
    37	
    38	/* Store the calling environment in ENV, also saving the signal mask.
    39	   Return 0.  */
    40	extern int setjmp (jmp_buf __env) __THROWNL;
    41	
    42	/* Store the calling environment in ENV, also saving the
    43	   signal mask if SAVEMASK is nonzero.  Return 0.
    44	   This is the internal name for `sigsetjmp'.  */
    45	extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;
    46	
    47	/* Store the calling environment in ENV, not saving the signal mask.
    48	   Return 0.  */
    49	extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL;
    50	
    51	/* Do not save the signal mask.  This is equivalent to the `_setjmp'
    52	   BSD function.  */
    53	#define setjmp(env)	_setjmp (env)
    54	
    55	
    56	/* Jump to the environment saved in ENV, making the
    57	   `setjmp' call there return VAL, or 1 if VAL is 0.  */
    58	extern void longjmp (struct __jmp_buf_tag __env[1], int __val)
    59	     __THROWNL __attribute__ ((__noreturn__));
    60	
    61	#if defined __USE_MISC || defined __USE_XOPEN
    62	/* Same.  Usually `_longjmp' is used with `_setjmp', which does not save
    63	   the signal mask.  But it is how ENV was saved that determines whether
    64	   `longjmp' restores the mask; `_longjmp' is just an alias.  */
    65	extern void _longjmp (struct __jmp_buf_tag __env[1], int __val)
    66	     __THROWNL __attribute__ ((__noreturn__));
    67	#endif
    68	
    69	
    70	#ifdef	__USE_POSIX
    71	/* Use the same type for `jmp_buf' and `sigjmp_buf'.
    72	   The `__mask_was_saved' flag determines whether
    73	   or not `longjmp' will restore the signal mask.  */
    74	typedef struct __jmp_buf_tag sigjmp_buf[1];
    75	
    76	/* Store the calling environment in ENV, also saving the
    77	   signal mask if SAVEMASK is nonzero.  Return 0.  */
    78	# define sigsetjmp(env, savemask)	__sigsetjmp (env, savemask)
    79	
    80	/* Jump to the environment saved in ENV, making the
    81	   sigsetjmp call there return VAL, or 1 if VAL is 0.
    82	   Restore the signal mask if that sigsetjmp call saved it.
    83	   This is just an alias `longjmp'.  */
    84	extern void siglongjmp (sigjmp_buf __env, int __val)
    85	     __THROWNL __attribute__ ((__noreturn__));
    86	#endif /* Use POSIX.  */
    87	
    88	
    89	/* Define helper functions to catch unsafe code.  */
    90	#if __USE_FORTIFY_LEVEL > 0
    91	# include <bits/setjmp2.h>
    92	#endif
    93	
    94	__END_DECLS
    95	
    96	#endif /* setjmp.h  */