lib/sys_select.in.h

/* Substitute for <sys/select.h>.
   Copyright (C) 2007-2026 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

# if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
# endif
@PRAGMA_COLUMNS@

/* This file uses #include_next of a system file that defines time_t.
   For the 'year2038' module to work right, <config.h> needs to have been
   included before.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

/* On Solaris 2.6, <sys/types.h> and <sys/time.h> both include <sys/select.h>.
   On Cygwin and OpenBSD, <sys/time.h> includes <sys/select.h>.
   Simply delegate to the system's header in this case.  */
#if (@HAVE_SYS_SELECT_H@                                                \
     && !defined _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TYPES_H             \
     && (defined __sun && defined _SYS_TYPES_H                          \
         && (! (defined _XOPEN_SOURCE || defined _POSIX_C_SOURCE)       \
             || defined __EXTENSIONS__)))

# define _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TYPES_H
# @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@

#elif (@HAVE_SYS_SELECT_H@                                              \
       && (defined _CYGWIN_SYS_TIME_H                                   \
           || (!defined _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H       \
               && ((defined __OpenBSD__ && defined _SYS_TIME_H_)        \
                   || (defined __sun && defined _SYS_TIME_H             \
                       && (! (defined _XOPEN_SOURCE                     \
                              || defined _POSIX_C_SOURCE)               \
                           || defined __EXTENSIONS__))))))

# define _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H
# @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@

/* On OpenBSD 5.0, <pthread.h> includes <sys/types.h>, which includes
   <sys/select.h>.  At this point we cannot include <signal.h>, because that
   includes gnulib's pthread.h override, which gives a syntax error because
   /usr/include/pthread.h has not been completely processed.  Simply delegate
   to the system's header in this case.  */
#elif @HAVE_SYS_SELECT_H@ && defined __OpenBSD__ && (defined _PTHREAD_H_ && !defined PTHREAD_MUTEX_INITIALIZER)

# @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@

#else

#ifndef _@GUARD_PREFIX@_SYS_SELECT_H

/* This file uses GNULIB_POSIXCHECK, HAVE_RAW_DECL_*.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

/* On many platforms, <sys/select.h> assumes prior inclusion of
   <sys/types.h>.  Also, mingw defines sigset_t there, instead of
   in <signal.h> where it belongs.  */
#include <sys/types.h>

#if @HAVE_SYS_SELECT_H@

/* Mac OS X, AIX, HP-UX, Solaris, Interix declare select() in <sys/time.h>.
   But avoid namespace pollution on glibc systems, a circular include
   <sys/select.h> -> <sys/time.h> -> <sys/select.h> on FreeBSD 13.1, and
   "unknown type name" problems on Cygwin.  */
# if !(defined __GLIBC__ || defined __FreeBSD__ || defined __CYGWIN__)
#  include <sys/time.h>
# endif

/* The include_next requires a split double-inclusion guard.  */
# @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@

#endif

/* Get definition of 'sigset_t'.
   But avoid namespace pollution on glibc systems and "unknown type
   name" problems on Cygwin.
   On OS/2 kLIBC, sigset_t is defined in <sys/select.h>, too. In addition,
   if <sys/param.h> is included, <types.h> -> <sys/types.h> -> <sys/select.h>
   are included. Then <signal.h> -> <pthread.h> are included by GNULIB. By the
   way, <pthread.h> requires PAGE_SIZE defined in <sys/param.h>. However,
   <sys/param.h> has not been processed, yet. As a result, 'PAGE_SIZE'
   undeclared error occurs in <pthread.h>.
   Do this after the include_next (for the sake of OpenBSD 5.0) but before
   the split double-inclusion guard (for the sake of Solaris).  */
#if !((defined __GLIBC__ || defined __CYGWIN__ || defined __KLIBC__) \
      && !defined __UCLIBC__)
# include <signal.h>
#endif

#ifndef _@GUARD_PREFIX@_SYS_SELECT_H
#define _@GUARD_PREFIX@_SYS_SELECT_H

#if !@HAVE_SYS_SELECT_H@
/* A platform that lacks <sys/select.h>.  */
/* Get the 'struct timeval' and 'fd_set' types and the FD_* macros
   on most platforms.  */
# include <sys/time.h>
/* On HP-UX 11, <sys/time.h> provides an FD_ZERO implementation
   that relies on memset(), but without including <string.h>.  */
# if defined __hpux
#  include <string.h>
# endif
/* On native Windows platforms:
   Get the 'fd_set' type.
   Get the close() declaration before we override it.  */
# if @HAVE_WINSOCK2_H@
#  if !defined _GL_INCLUDING_WINSOCK2_H
#   define _GL_INCLUDING_WINSOCK2_H
#   include <winsock2.h>
#   undef _GL_INCLUDING_WINSOCK2_H
#  endif
#  include <io.h>
# endif
#endif

/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */

/* The definition of _GL_WARN_ON_USE is copied here.  */


/* Fix some definitions from <winsock2.h>.  */

#if @HAVE_WINSOCK2_H@

/* Define type 'suseconds_t'.  */
# if !GNULIB_defined_suseconds_t
typedef int suseconds_t;
#  define GNULIB_defined_suseconds_t 1
# endif

# if !GNULIB_defined_rpl_fd_isset

/* Re-define FD_ISSET to avoid a WSA call while we are not using
   network sockets.  */
static int
rpl_fd_isset (SOCKET fd, const fd_set * set)
{
  if (set == NULL)
    return 0;

  for (u_int i = 0; i < set->fd_count; i++)
    if (set->fd_array[i] == fd)
      return 1;

  return 0;
}

#  define GNULIB_defined_rpl_fd_isset 1
# endif

# undef FD_ISSET
# define FD_ISSET(fd, set) rpl_fd_isset(fd, set)

#endif

/* Hide some function declarations from <winsock2.h>.  */

#if @HAVE_WINSOCK2_H@
# if !defined _@GUARD_PREFIX@_UNISTD_H
#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#   undef close
#   define close close_used_without_including_unistd_h
#  elif !defined __clang__
    _GL_WARN_ON_USE (close,
                     "close() used without including <unistd.h>");
#  endif
#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#   undef gethostname
#   define gethostname gethostname_used_without_including_unistd_h
#  elif !defined __clang__
    _GL_WARN_ON_USE (gethostname,
                     "gethostname() used without including <unistd.h>");
#  endif
# endif
# if !defined _@GUARD_PREFIX@_SYS_SOCKET_H
#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#   undef socket
#   define socket              socket_used_without_including_sys_socket_h
#   undef connect
#   define connect             connect_used_without_including_sys_socket_h
#   undef accept
#   define accept              accept_used_without_including_sys_socket_h
#   undef bind
#   define bind                bind_used_without_including_sys_socket_h
#   undef getpeername
#   define getpeername         getpeername_used_without_including_sys_socket_h
#   undef getsockname
#   define getsockname         getsockname_used_without_including_sys_socket_h
#   undef getsockopt
#   define getsockopt          getsockopt_used_without_including_sys_socket_h
#   undef listen
#   define listen              listen_used_without_including_sys_socket_h
#   undef recv
#   define recv                recv_used_without_including_sys_socket_h
#   undef send
#   define send                send_used_without_including_sys_socket_h
#   undef recvfrom
#   define recvfrom            recvfrom_used_without_including_sys_socket_h
#   undef sendto
#   define sendto              sendto_used_without_including_sys_socket_h
#   undef setsockopt
#   define setsockopt          setsockopt_used_without_including_sys_socket_h
#   undef shutdown
#   define shutdown            shutdown_used_without_including_sys_socket_h
#  elif !defined __clang__
    _GL_WARN_ON_USE (socket,
                     "socket() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (connect,
                     "connect() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (accept,
                     "accept() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (bind,
                     "bind() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (getpeername,
                     "getpeername() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (getsockname,
                     "getsockname() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (getsockopt,
                     "getsockopt() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (listen,
                     "listen() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (recv,
                     "recv() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (send,
                     "send() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (recvfrom,
                     "recvfrom() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (sendto,
                     "sendto() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (setsockopt,
                     "setsockopt() used without including <sys/socket.h>");
    _GL_WARN_ON_USE (shutdown,
                     "shutdown() used without including <sys/socket.h>");
#  endif
# endif
#endif


#if @GNULIB_PSELECT@
# if @REPLACE_PSELECT@
#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#   undef pselect
#   define pselect rpl_pselect
#  endif
_GL_FUNCDECL_RPL (pselect, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   struct timespec const *restrict, const sigset_t *restrict), );
_GL_CXXALIAS_RPL (pselect, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   struct timespec const *restrict, const sigset_t *restrict));
# else
#  if !@HAVE_PSELECT@
_GL_FUNCDECL_SYS (pselect, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   struct timespec const *restrict, const sigset_t *restrict), );
#  endif
/* Need to cast, because on AIX 7, the second, third, fourth argument may be
                        void *restrict,   void *restrict,   void *restrict.  */
_GL_CXXALIAS_SYS_CAST (pselect, int,
                       (int,
                        fd_set *restrict, fd_set *restrict, fd_set *restrict,
                        struct timespec const *restrict,
                        const sigset_t *restrict));
# endif
# if __GLIBC__ >= 2
_GL_CXXALIASWARN (pselect);
# endif
#elif defined GNULIB_POSIXCHECK
# if HAVE_RAW_DECL_PSELECT
_GL_WARN_ON_USE (pselect, "pselect is not portable - "
                 "use gnulib module pselect for portability");
# endif
#endif

#if @GNULIB_SELECT@
# if @REPLACE_SELECT@
#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
#   undef select
#   define select rpl_select
#  endif
_GL_FUNCDECL_RPL (select, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   struct timeval *restrict), );
_GL_CXXALIAS_RPL (select, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   timeval *restrict));
# else
_GL_CXXALIAS_SYS (select, int,
                  (int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
                   timeval *restrict));
# endif
# if __GLIBC__ >= 2
_GL_CXXALIASWARN (select);
# endif
#elif @HAVE_WINSOCK2_H@
# if !GNULIB_SELECT
#  undef select
#  define select select_used_without_requesting_gnulib_module_select
# endif
#elif defined GNULIB_POSIXCHECK
# if HAVE_RAW_DECL_SELECT
_GL_WARN_ON_USE (select, "select is not always POSIX compliant - "
                 "use gnulib module select for portability");
# endif
#endif


#endif /* _@GUARD_PREFIX@_SYS_SELECT_H */


/* Includes that provide only macros that don't need to be overridden.
   (Includes that are needed for type definitions and function declarations
   have their place above, before the function overrides.)  */

/* On AIX 7 and Solaris 10, <sys/select.h> provides an FD_ZERO implementation
   that relies on memset(), but without including <string.h>.
   But in any case avoid namespace pollution on glibc systems.  */
# if (defined __OpenBSD__ || defined _AIX || defined __sun || defined __BEOS__) \
     && ! defined __GLIBC__
#  include <string.h>
# endif


#endif /* _@GUARD_PREFIX@_SYS_SELECT_H */
#endif