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The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/bits/poll2.h

     1	/* Checking macros for poll functions.
     2	   Copyright (C) 2012-2026 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _SYS_POLL_H
    20	# error "Never include <bits/poll2.h> directly; use <sys/poll.h> instead."
    21	#endif
    22	
    23	
    24	__BEGIN_DECLS
    25	
    26	extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
    27					      int __timeout), poll);
    28	extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
    29			       __SIZE_TYPE__ __fdslen)
    30	    __attr_access ((__write_only__, 1, 2));
    31	extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
    32						 int __timeout, __SIZE_TYPE__ __fdslen),
    33			       __poll_chk)
    34	  __warnattr ("poll called with fds buffer too small file nfds entries");
    35	
    36	__fortify_function __fortified_attr_access (__write_only__, 1, 2)
    37	__attribute_overloadable__ int
    38	poll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
    39	      int __timeout)
    40	     __fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
    41						      "poll called with fds buffer "
    42						      "too small file nfds entries")
    43	{
    44	  return __glibc_fortify (poll, __nfds, sizeof (*__fds),
    45				  __glibc_objsize (__fds),
    46				  __fds, __nfds, __timeout);
    47	}
    48	
    49	
    50	#ifdef __USE_GNU
    51	# ifdef __USE_TIME64_REDIRECTS
    52	extern int __REDIRECT (__ppoll64_alias, (struct pollfd *__fds, nfds_t __nfds,
    53					       const struct timespec *__timeout,
    54					       const __sigset_t *__ss), __ppoll64);
    55	extern int __ppoll64_chk (struct pollfd *__fds, nfds_t __nfds,
    56				  const struct timespec *__timeout,
    57				  const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
    58	    __attr_access ((__write_only__, 1, 2));
    59	extern int __REDIRECT (__ppoll64_chk_warn, (struct pollfd *__fds, nfds_t __n,
    60						    const struct timespec *__timeout,
    61						    const __sigset_t *__ss,
    62						    __SIZE_TYPE__ __fdslen),
    63			       __ppoll64_chk)
    64	  __warnattr ("ppoll called with fds buffer too small file nfds entries");
    65	
    66	__fortify_function __fortified_attr_access (__write_only__, 1, 2)
    67	__attribute_overloadable__ int
    68	ppoll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
    69	       const struct timespec *__timeout, const __sigset_t *__ss)
    70	     __fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
    71						      "ppoll called with fds buffer "
    72						      "too small file nfds entries")
    73	{
    74	  return __glibc_fortify (ppoll64, __nfds, sizeof (*__fds),
    75				  __glibc_objsize (__fds),
    76				  __fds, __nfds, __timeout, __ss);
    77	}
    78	# else
    79	extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
    80					       const struct timespec *__timeout,
    81					       const __sigset_t *__ss), ppoll);
    82	extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
    83				const struct timespec *__timeout,
    84				const __sigset_t *__ss, __SIZE_TYPE__ __fdslen)
    85	    __attr_access ((__write_only__, 1, 2));
    86	extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
    87						  const struct timespec *__timeout,
    88						  const __sigset_t *__ss,
    89						  __SIZE_TYPE__ __fdslen),
    90			       __ppoll_chk)
    91	  __warnattr ("ppoll called with fds buffer too small file nfds entries");
    92	
    93	__fortify_function __fortified_attr_access (__write_only__, 1, 2)
    94	__attribute_overloadable__ int
    95	ppoll (__fortify_clang_overload_arg (struct pollfd *, ,__fds), nfds_t __nfds,
    96	       const struct timespec *__timeout, const __sigset_t *__ss)
    97	     __fortify_clang_warning_only_if_bos_lt2 (__nfds, __fds, sizeof (*__fds),
    98						      "ppoll called with fds buffer "
    99						      "too small file nfds entries")
   100	{
   101	  return __glibc_fortify (ppoll, __nfds, sizeof (*__fds),
   102				  __glibc_objsize (__fds),
   103				  __fds, __nfds, __timeout, __ss);
   104	}
   105	# endif
   106	#endif
   107	
   108	__END_DECLS