# sys_socket_h.m4 serial 25

dnl Copyright (C) 2005-2020 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl From Simon Josefsson.

AC_DEFUN([gl_HEADER_SYS_SOCKET],

[

  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST])

  dnl On OSF/1, the functions recv(), send(), recvfrom(), sendto() have

  dnl old-style declarations (with return type 'int' instead of 'ssize_t')

  dnl unless _POSIX_PII_SOCKET is defined.

  case "$host_os" in

    osf*)

      AC_DEFINE([_POSIX_PII_SOCKET], [1],

        [Define to 1 in order to get the POSIX compatible declarations

         of socket functions.])

      ;;

  esac

  AC_CACHE_CHECK([whether <sys/socket.h> is self-contained],

    [gl_cv_header_sys_socket_h_selfcontained],

    [

      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]], [[]])],

        [gl_cv_header_sys_socket_h_selfcontained=yes],

        [gl_cv_header_sys_socket_h_selfcontained=no])

    ])

  if test $gl_cv_header_sys_socket_h_selfcontained = yes; then

    dnl If the shutdown function exists, <sys/socket.h> should define

    dnl SHUT_RD, SHUT_WR, SHUT_RDWR.

    AC_CHECK_FUNCS([shutdown])

    if test $ac_cv_func_shutdown = yes; then

      AC_CACHE_CHECK([whether <sys/socket.h> defines the SHUT_* macros],

        [gl_cv_header_sys_socket_h_shut],

        [

          AC_COMPILE_IFELSE(

            [AC_LANG_PROGRAM([[#include <sys/socket.h>]],

               [[int a[] = { SHUT_RD, SHUT_WR, SHUT_RDWR };]])],

            [gl_cv_header_sys_socket_h_shut=yes],

            [gl_cv_header_sys_socket_h_shut=no])

        ])

      if test $gl_cv_header_sys_socket_h_shut = no; then

        SYS_SOCKET_H='sys/socket.h'

      fi

    fi

  fi

  # We need to check for ws2tcpip.h now.

  gl_PREREQ_SYS_H_SOCKET

  AC_CHECK_TYPES([struct sockaddr_storage, sa_family_t],,,[

  /* sys/types.h is not needed according to POSIX, but the

     sys/socket.h in i386-unknown-freebsd4.10 and

     powerpc-apple-darwin5.5 required it. */

#include <sys/types.h>

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#endif

#ifdef HAVE_WS2TCPIP_H

#include <ws2tcpip.h>

#endif

])

  if test $ac_cv_type_struct_sockaddr_storage = no; then

    HAVE_STRUCT_SOCKADDR_STORAGE=0

  fi

  if test $ac_cv_type_sa_family_t = no; then

    HAVE_SA_FAMILY_T=0

  fi

  if test $ac_cv_type_struct_sockaddr_storage != no; then

    AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family],

      [],

      [HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=0],

      [#include <sys/types.h>

       #ifdef HAVE_SYS_SOCKET_H

       #include <sys/socket.h>

       #endif

       #ifdef HAVE_WS2TCPIP_H

       #include <ws2tcpip.h>

       #endif

      ])

  fi

  if test $HAVE_STRUCT_SOCKADDR_STORAGE = 0 || test $HAVE_SA_FAMILY_T = 0 \

     || test $HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY = 0; then

    SYS_SOCKET_H='sys/socket.h'

  fi

  gl_PREREQ_SYS_H_WINSOCK2

  dnl Check for declarations of anything we want to poison if the

  dnl corresponding gnulib module is not in use.

  gl_WARN_ON_USE_PREPARE([[

/* Some systems require prerequisite headers.  */

#include <sys/types.h>

#include <sys/socket.h>

    ]], [socket connect accept bind getpeername getsockname getsockopt

    listen recv send recvfrom sendto setsockopt shutdown accept4])

  AC_REQUIRE([AC_C_RESTRICT])

])

AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],

[

  dnl Check prerequisites of the <sys/socket.h> replacement.

  AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])

  gl_CHECK_NEXT_HEADERS([sys/socket.h])

  if test $ac_cv_header_sys_socket_h = yes; then

    HAVE_SYS_SOCKET_H=1

  else

    HAVE_SYS_SOCKET_H=0

  fi

  AC_SUBST([HAVE_SYS_SOCKET_H])

  gl_PREREQ_SYS_H_WS2TCPIP

])

# Common prerequisites of the <sys/socket.h> replacement and of the

# <sys/select.h> replacement.

# Sets and substitutes HAVE_WINSOCK2_H.

AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2],

[

  m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])

  m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])])

  AC_CHECK_HEADERS_ONCE([sys/socket.h])

  if test $ac_cv_header_sys_socket_h != yes; then

    dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make

    dnl the check for those headers unconditional; yet cygwin reports

    dnl that the headers are present but cannot be compiled (since on

    dnl cygwin, all socket information should come from sys/socket.h).

    AC_CHECK_HEADERS([winsock2.h])

  fi

  if test "$ac_cv_header_winsock2_h" = yes; then

    HAVE_WINSOCK2_H=1

    UNISTD_H_HAVE_WINSOCK2_H=1

    SYS_IOCTL_H_HAVE_WINSOCK2_H=1

  else

    HAVE_WINSOCK2_H=0

  fi

  AC_SUBST([HAVE_WINSOCK2_H])

])

# Common prerequisites of the <sys/socket.h> replacement and of the

# <arpa/inet.h> replacement.

# Sets and substitutes HAVE_WS2TCPIP_H.

AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],

[

  AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])

  if test $ac_cv_header_sys_socket_h = yes; then

    HAVE_WS2TCPIP_H=0

  else

    if test $ac_cv_header_ws2tcpip_h = yes; then

      HAVE_WS2TCPIP_H=1

    else

      HAVE_WS2TCPIP_H=0

    fi

  fi

  AC_SUBST([HAVE_WS2TCPIP_H])

])

AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])

  gl_MODULE_INDICATOR_SET_VARIABLE([$1])

  dnl Define it also as a C macro, for the benefit of the unit tests.

  gl_MODULE_INDICATOR_FOR_TESTS([$1])

])

AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS],

[

  GNULIB_SOCKET=0;      AC_SUBST([GNULIB_SOCKET])

  GNULIB_CONNECT=0;     AC_SUBST([GNULIB_CONNECT])

  GNULIB_ACCEPT=0;      AC_SUBST([GNULIB_ACCEPT])

  GNULIB_BIND=0;        AC_SUBST([GNULIB_BIND])

  GNULIB_GETPEERNAME=0; AC_SUBST([GNULIB_GETPEERNAME])

  GNULIB_GETSOCKNAME=0; AC_SUBST([GNULIB_GETSOCKNAME])

  GNULIB_GETSOCKOPT=0;  AC_SUBST([GNULIB_GETSOCKOPT])

  GNULIB_LISTEN=0;      AC_SUBST([GNULIB_LISTEN])

  GNULIB_RECV=0;        AC_SUBST([GNULIB_RECV])

  GNULIB_SEND=0;        AC_SUBST([GNULIB_SEND])

  GNULIB_RECVFROM=0;    AC_SUBST([GNULIB_RECVFROM])

  GNULIB_SENDTO=0;      AC_SUBST([GNULIB_SENDTO])

  GNULIB_SETSOCKOPT=0;  AC_SUBST([GNULIB_SETSOCKOPT])

  GNULIB_SHUTDOWN=0;    AC_SUBST([GNULIB_SHUTDOWN])

  GNULIB_ACCEPT4=0;     AC_SUBST([GNULIB_ACCEPT4])

  HAVE_STRUCT_SOCKADDR_STORAGE=1; AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE])

  HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=1;

                        AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY])

  HAVE_SA_FAMILY_T=1;   AC_SUBST([HAVE_SA_FAMILY_T])

  HAVE_ACCEPT4=1;       AC_SUBST([HAVE_ACCEPT4])

])