1 # sys_socket_h.m4 serial 29
2 dnl Copyright (C) 2005-2023 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl From Simon Josefsson.
9 AC_DEFUN_ONCE([gl_SYS_SOCKET_H],
11 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
12 AC_REQUIRE([AC_CANONICAL_HOST])
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.
19 AC_DEFINE([_POSIX_PII_SOCKET], [1],
20 [Define to 1 in order to get the POSIX compatible declarations
21 of socket functions.])
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],
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])
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],
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])
47 if test $gl_cv_header_sys_socket_h_shut = no; then
48 GL_GENERATE_SYS_SOCKET_H=true
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>
62 #ifdef HAVE_WS2TCPIP_H
66 if test $ac_cv_type_struct_sockaddr_storage = no; then
67 HAVE_STRUCT_SOCKADDR_STORAGE=0
69 if test $ac_cv_type_sa_family_t = no; then
72 if test $ac_cv_type_struct_sockaddr_storage != no; then
73 AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family],
75 [HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=0],
76 [#include <sys/types.h>
77 #ifdef HAVE_SYS_SOCKET_H
78 #include <sys/socket.h>
80 #ifdef HAVE_WS2TCPIP_H
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
89 gl_PREREQ_SYS_H_WINSOCK2
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])
100 AC_REQUIRE([AC_C_RESTRICT])
103 AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],
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
113 AC_SUBST([HAVE_SYS_SOCKET_H])
114 gl_PREREQ_SYS_H_WS2TCPIP
117 # Common prerequisites of the <sys/socket.h> replacement and of the
118 # <sys/select.h> replacement.
119 # Sets and substitutes HAVE_WINSOCK2_H.
120 AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2],
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 $ac_cv_header_sys_socket_h != yes; then
126 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
127 dnl the check for those headers unconditional; yet cygwin reports
128 dnl that the headers are present but cannot be compiled (since on
129 dnl cygwin, all socket information should come from sys/socket.h).
130 AC_CHECK_HEADERS([winsock2.h])
132 if test "$ac_cv_header_winsock2_h" = yes; then
134 UNISTD_H_HAVE_WINSOCK2_H=1
135 SYS_IOCTL_H_HAVE_WINSOCK2_H=1
139 AC_SUBST([HAVE_WINSOCK2_H])
142 # Common prerequisites of the <sys/socket.h> replacement and of the
143 # <arpa/inet.h> replacement.
144 # Sets and substitutes HAVE_WS2TCPIP_H.
145 AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],
147 AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
148 if test $ac_cv_header_sys_socket_h = yes; then
151 if test $ac_cv_header_ws2tcpip_h = yes; then
157 AC_SUBST([HAVE_WS2TCPIP_H])
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.
164 AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],
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])
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.
176 AC_DEFUN([gl_SYS_SOCKET_H_REQUIRE_DEFAULTS],
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])
195 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS])
196 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
199 AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS],
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])