3 dnl Copyright (C) 2005-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl From Simon Josefsson.
10 AC_DEFUN_ONCE([gl_SYS_SOCKET_H],
12 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
13 AC_REQUIRE([AC_CANONICAL_HOST])
15 dnl On OSF/1, the functions recv(), send(), recvfrom(), sendto() have
16 dnl old-style declarations (with return type 'int' instead of 'ssize_t')
17 dnl unless _POSIX_PII_SOCKET is defined.
20 AC_DEFINE([_POSIX_PII_SOCKET], [1],
21 [Define to 1 in order to get the POSIX compatible declarations
22 of socket functions.])
26 GL_GENERATE_SYS_SOCKET_H=false
27 AC_CACHE_CHECK([whether <sys/socket.h> is self-contained],
28 [gl_cv_header_sys_socket_h_selfcontained],
30 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]], [[]])],
31 [gl_cv_header_sys_socket_h_selfcontained=yes],
32 [gl_cv_header_sys_socket_h_selfcontained=no])
34 if test $gl_cv_header_sys_socket_h_selfcontained = yes; then
35 dnl If the shutdown function exists, <sys/socket.h> should define
36 dnl SHUT_RD, SHUT_WR, SHUT_RDWR.
37 AC_CHECK_FUNCS([shutdown])
38 if test $ac_cv_func_shutdown = yes; then
39 AC_CACHE_CHECK([whether <sys/socket.h> defines the SHUT_* macros],
40 [gl_cv_header_sys_socket_h_shut],
43 [AC_LANG_PROGRAM([[#include <sys/socket.h>]],
44 [[int a[] = { SHUT_RD, SHUT_WR, SHUT_RDWR };]])],
45 [gl_cv_header_sys_socket_h_shut=yes],
46 [gl_cv_header_sys_socket_h_shut=no])
48 if test $gl_cv_header_sys_socket_h_shut = no; then
49 GL_GENERATE_SYS_SOCKET_H=true
53 # We need to check for ws2tcpip.h now.
54 gl_PREREQ_SYS_H_SOCKET
55 AC_CHECK_TYPES([struct sockaddr_storage, sa_family_t],,,[
56 /* sys/types.h is not needed according to POSIX, but the
57 sys/socket.h in i386-unknown-freebsd4.10 and
58 powerpc-apple-darwin5.5 required it. */
59 #include <sys/types.h>
60 #ifdef HAVE_SYS_SOCKET_H
61 #include <sys/socket.h>
63 #ifdef HAVE_WS2TCPIP_H
67 if test $ac_cv_type_struct_sockaddr_storage = no; then
68 HAVE_STRUCT_SOCKADDR_STORAGE=0
70 if test $ac_cv_type_sa_family_t = no; then
73 if test $ac_cv_type_struct_sockaddr_storage != no; then
74 AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family],
76 [HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=0],
77 [#include <sys/types.h>
78 #ifdef HAVE_SYS_SOCKET_H
79 #include <sys/socket.h>
81 #ifdef HAVE_WS2TCPIP_H
86 if test $HAVE_STRUCT_SOCKADDR_STORAGE = 0 || test $HAVE_SA_FAMILY_T = 0 \
87 || test $HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY = 0; then
88 GL_GENERATE_SYS_SOCKET_H=true
90 gl_PREREQ_SYS_H_WINSOCK2
92 dnl Check for declarations of anything we want to poison if the
93 dnl corresponding gnulib module is not in use.
94 gl_WARN_ON_USE_PREPARE([[
95 /* Some systems require prerequisite headers. */
96 #include <sys/types.h>
97 #include <sys/socket.h>
98 ]], [socket connect accept bind getpeername getsockname getsockopt
99 listen recv send recvfrom sendto setsockopt shutdown accept4])
101 AC_REQUIRE([AC_C_RESTRICT])
104 AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],
106 dnl Check prerequisites of the <sys/socket.h> replacement.
107 AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
108 gl_CHECK_NEXT_HEADERS([sys/socket.h])
109 if test $ac_cv_header_sys_socket_h = yes; then
114 AC_SUBST([HAVE_SYS_SOCKET_H])
115 gl_PREREQ_SYS_H_WS2TCPIP
118 # Common prerequisites of the <sys/socket.h> replacement and of the
119 # <sys/select.h> replacement.
120 # Sets and substitutes HAVE_WINSOCK2_H.
121 AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2],
123 m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
124 m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])])
125 AC_CHECK_HEADERS_ONCE([sys/socket.h])
126 if test $ac_cv_header_sys_socket_h != yes; then
127 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
128 dnl the check for those headers unconditional; yet cygwin reports
129 dnl that the headers are present but cannot be compiled (since on
130 dnl cygwin, all socket information should come from sys/socket.h).
131 AC_CHECK_HEADERS([winsock2.h])
133 if test "$ac_cv_header_winsock2_h" = yes; then
135 UNISTD_H_HAVE_WINSOCK2_H=1
136 SYS_IOCTL_H_HAVE_WINSOCK2_H=1
140 AC_SUBST([HAVE_WINSOCK2_H])
143 # Common prerequisites of the <sys/socket.h> replacement and of the
144 # <arpa/inet.h> replacement.
145 # Sets and substitutes HAVE_WS2TCPIP_H.
146 AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],
148 AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
149 if test $ac_cv_header_sys_socket_h = yes; then
152 if test $ac_cv_header_ws2tcpip_h = yes; then
158 AC_SUBST([HAVE_WS2TCPIP_H])
161 # gl_SYS_SOCKET_MODULE_INDICATOR([modulename])
162 # sets the shell variable that indicates the presence of the given module
163 # to a C preprocessor expression that will evaluate to 1.
164 # This macro invocation must not occur in macros that are AC_REQUIREd.
165 AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],
167 dnl Ensure to expand the default settings once only.
168 gl_SYS_SOCKET_H_REQUIRE_DEFAULTS
169 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
170 dnl Define it also as a C macro, for the benefit of the unit tests.
171 gl_MODULE_INDICATOR_FOR_TESTS([$1])
174 # Initializes the default values for AC_SUBSTed shell variables.
175 # This macro must not be AC_REQUIREd. It must only be invoked, and only
176 # outside of macros or in macros that are not AC_REQUIREd.
177 AC_DEFUN([gl_SYS_SOCKET_H_REQUIRE_DEFAULTS],
179 m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS], [
180 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SOCKET])
181 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_CONNECT])
182 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT])
183 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_BIND])
184 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETPEERNAME])
185 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKNAME])
186 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETSOCKOPT])
187 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_LISTEN])
188 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECV])
189 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SEND])
190 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RECVFROM])
191 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SENDTO])
192 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SETSOCKOPT])
193 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SHUTDOWN])
194 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_ACCEPT4])
196 m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_SOCKET_H_MODULE_INDICATOR_DEFAULTS])
197 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
200 AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS],
202 HAVE_STRUCT_SOCKADDR_STORAGE=1; AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE])
203 HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=1;
204 AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY])
205 HAVE_SA_FAMILY_T=1; AC_SUBST([HAVE_SA_FAMILY_T])
206 HAVE_ACCEPT4=1; AC_SUBST([HAVE_ACCEPT4])