1# sys_socket_h.m4 serial 29 2dnl Copyright (C) 2005-2022 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl From Simon Josefsson. 8 9AC_DEFUN_ONCE([gl_SYS_SOCKET_H], 10[ 11 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS]) 12 AC_REQUIRE([AC_CANONICAL_HOST]) 13 14 dnl On OSF/1, the functions recv(), send(), recvfrom(), sendto() have 15 dnl old-style declarations (with return type 'int' instead of 'ssize_t') 16 dnl unless _POSIX_PII_SOCKET is defined. 17 case "$host_os" in 18 osf*) 19 AC_DEFINE([_POSIX_PII_SOCKET], [1], 20 [Define to 1 in order to get the POSIX compatible declarations 21 of socket functions.]) 22 ;; 23 esac 24 25 GL_GENERATE_SYS_SOCKET_H=false 26 AC_CACHE_CHECK([whether <sys/socket.h> is self-contained], 27 [gl_cv_header_sys_socket_h_selfcontained], 28 [ 29 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]], [[]])], 30 [gl_cv_header_sys_socket_h_selfcontained=yes], 31 [gl_cv_header_sys_socket_h_selfcontained=no]) 32 ]) 33 if test $gl_cv_header_sys_socket_h_selfcontained = yes; then 34 dnl If the shutdown function exists, <sys/socket.h> should define 35 dnl SHUT_RD, SHUT_WR, SHUT_RDWR. 36 AC_CHECK_FUNCS([shutdown]) 37 if test $ac_cv_func_shutdown = yes; then 38 AC_CACHE_CHECK([whether <sys/socket.h> defines the SHUT_* macros], 39 [gl_cv_header_sys_socket_h_shut], 40 [ 41 AC_COMPILE_IFELSE( 42 [AC_LANG_PROGRAM([[#include <sys/socket.h>]], 43 [[int a[] = { SHUT_RD, SHUT_WR, SHUT_RDWR };]])], 44 [gl_cv_header_sys_socket_h_shut=yes], 45 [gl_cv_header_sys_socket_h_shut=no]) 46 ]) 47 if test $gl_cv_header_sys_socket_h_shut = no; then 48 GL_GENERATE_SYS_SOCKET_H=true 49 fi 50 fi 51 fi 52 # We need to check for ws2tcpip.h now. 53 gl_PREREQ_SYS_H_SOCKET 54 AC_CHECK_TYPES([struct sockaddr_storage, sa_family_t],,,[ 55 /* sys/types.h is not needed according to POSIX, but the 56 sys/socket.h in i386-unknown-freebsd4.10 and 57 powerpc-apple-darwin5.5 required it. */ 58#include <sys/types.h> 59#ifdef HAVE_SYS_SOCKET_H 60#include <sys/socket.h> 61#endif 62#ifdef HAVE_WS2TCPIP_H 63#include <ws2tcpip.h> 64#endif 65]) 66 if test $ac_cv_type_struct_sockaddr_storage = no; then 67 HAVE_STRUCT_SOCKADDR_STORAGE=0 68 fi 69 if test $ac_cv_type_sa_family_t = no; then 70 HAVE_SA_FAMILY_T=0 71 fi 72 if test $ac_cv_type_struct_sockaddr_storage != no; then 73 AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family], 74 [], 75 [HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=0], 76 [#include <sys/types.h> 77 #ifdef HAVE_SYS_SOCKET_H 78 #include <sys/socket.h> 79 #endif 80 #ifdef HAVE_WS2TCPIP_H 81 #include <ws2tcpip.h> 82 #endif 83 ]) 84 fi 85 if test $HAVE_STRUCT_SOCKADDR_STORAGE = 0 || test $HAVE_SA_FAMILY_T = 0 \ 86 || test $HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY = 0; then 87 GL_GENERATE_SYS_SOCKET_H=true 88 fi 89 gl_PREREQ_SYS_H_WINSOCK2 90 91 dnl Check for declarations of anything we want to poison if the 92 dnl corresponding gnulib module is not in use. 93 gl_WARN_ON_USE_PREPARE([[ 94/* Some systems require prerequisite headers. */ 95#include <sys/types.h> 96#include <sys/socket.h> 97 ]], [socket connect accept bind getpeername getsockname getsockopt 98 listen recv send recvfrom sendto setsockopt shutdown accept4]) 99 100 AC_REQUIRE([AC_C_RESTRICT]) 101]) 102 103AC_DEFUN([gl_PREREQ_SYS_H_SOCKET], 104[ 105 dnl Check prerequisites of the <sys/socket.h> replacement. 106 AC_REQUIRE([gl_CHECK_SOCKET_HEADERS]) 107 gl_CHECK_NEXT_HEADERS([sys/socket.h]) 108 if test $ac_cv_header_sys_socket_h = yes; then 109 HAVE_SYS_SOCKET_H=1 110 else 111 HAVE_SYS_SOCKET_H=0 112 fi 113 AC_SUBST([HAVE_SYS_SOCKET_H]) 114 gl_PREREQ_SYS_H_WS2TCPIP 115]) 116 117# Common prerequisites of the <sys/socket.h> replacement and of the 118# <sys/select.h> replacement. 119# Sets and substitutes HAVE_WINSOCK2_H. 120AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2], 121[ 122 m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])]) 123 m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])]) 124 AC_CHECK_HEADERS_ONCE([sys/socket.h]) 125 if test $ac_cv_header_sys_socket_h != yes; then 126 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make 127 dnl the check for those headers unconditional; yet cygwin reports 128 dnl that the headers are present but cannot be compiled (since on 129 dnl cygwin, all socket information should come from sys/socket.h). 130 AC_CHECK_HEADERS([winsock2.h]) 131 fi 132 if test "$ac_cv_header_winsock2_h" = yes; then 133 HAVE_WINSOCK2_H=1 134 UNISTD_H_HAVE_WINSOCK2_H=1 135 SYS_IOCTL_H_HAVE_WINSOCK2_H=1 136 else 137 HAVE_WINSOCK2_H=0 138 fi 139 AC_SUBST([HAVE_WINSOCK2_H]) 140]) 141 142# Common prerequisites of the <sys/socket.h> replacement and of the 143# <arpa/inet.h> replacement. 144# Sets and substitutes HAVE_WS2TCPIP_H. 145AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP], 146[ 147 AC_REQUIRE([gl_CHECK_SOCKET_HEADERS]) 148 if test $ac_cv_header_sys_socket_h = yes; then 149 HAVE_WS2TCPIP_H=0 150 else 151 if test $ac_cv_header_ws2tcpip_h = yes; then 152 HAVE_WS2TCPIP_H=1 153 else 154 HAVE_WS2TCPIP_H=0 155 fi 156 fi 157 AC_SUBST([HAVE_WS2TCPIP_H]) 158]) 159 160# gl_SYS_SOCKET_MODULE_INDICATOR([modulename]) 161# sets the shell variable that indicates the presence of the given module 162# to a C preprocessor expression that will evaluate to 1. 163# This macro invocation must not occur in macros that are AC_REQUIREd. 164AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR], 165[ 166 dnl Ensure to expand the default settings once only. 167 gl_SYS_SOCKET_H_REQUIRE_DEFAULTS 168 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 169 dnl Define it also as a C macro, for the benefit of the unit tests. 170 gl_MODULE_INDICATOR_FOR_TESTS([$1]) 171]) 172 173# Initializes the default values for AC_SUBSTed shell variables. 174# This macro must not be AC_REQUIREd. It must only be invoked, and only 175# outside of macros or in macros that are not AC_REQUIREd. 176AC_DEFUN([gl_SYS_SOCKET_H_REQUIRE_DEFAULTS], 177[ 178 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS], [ 179 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SOCKET]) 180 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CONNECT]) 181 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT]) 182 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BIND]) 183 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETPEERNAME]) 184 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKNAME]) 185 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKOPT]) 186 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LISTEN]) 187 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECV]) 188 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SEND]) 189 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECVFROM]) 190 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SENDTO]) 191 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETSOCKOPT]) 192 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SHUTDOWN]) 193 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT4]) 194 ]) 195 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS]) 196 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS]) 197]) 198 199AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS], 200[ 201 HAVE_STRUCT_SOCKADDR_STORAGE=1; AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE]) 202 HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=1; 203 AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY]) 204 HAVE_SA_FAMILY_T=1; AC_SUBST([HAVE_SA_FAMILY_T]) 205 HAVE_ACCEPT4=1; AC_SUBST([HAVE_ACCEPT4]) 206]) 207