1# sys_socket_h.m4 serial 25
2dnl Copyright (C) 2005-2020 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([gl_HEADER_SYS_SOCKET],
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  AC_CACHE_CHECK([whether <sys/socket.h> is self-contained],
26    [gl_cv_header_sys_socket_h_selfcontained],
27    [
28      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]], [[]])],
29        [gl_cv_header_sys_socket_h_selfcontained=yes],
30        [gl_cv_header_sys_socket_h_selfcontained=no])
31    ])
32  if test $gl_cv_header_sys_socket_h_selfcontained = yes; then
33    dnl If the shutdown function exists, <sys/socket.h> should define
34    dnl SHUT_RD, SHUT_WR, SHUT_RDWR.
35    AC_CHECK_FUNCS([shutdown])
36    if test $ac_cv_func_shutdown = yes; then
37      AC_CACHE_CHECK([whether <sys/socket.h> defines the SHUT_* macros],
38        [gl_cv_header_sys_socket_h_shut],
39        [
40          AC_COMPILE_IFELSE(
41            [AC_LANG_PROGRAM([[#include <sys/socket.h>]],
42               [[int a[] = { SHUT_RD, SHUT_WR, SHUT_RDWR };]])],
43            [gl_cv_header_sys_socket_h_shut=yes],
44            [gl_cv_header_sys_socket_h_shut=no])
45        ])
46      if test $gl_cv_header_sys_socket_h_shut = no; then
47        SYS_SOCKET_H='sys/socket.h'
48      fi
49    fi
50  fi
51  # We need to check for ws2tcpip.h now.
52  gl_PREREQ_SYS_H_SOCKET
53  AC_CHECK_TYPES([struct sockaddr_storage, sa_family_t],,,[
54  /* sys/types.h is not needed according to POSIX, but the
55     sys/socket.h in i386-unknown-freebsd4.10 and
56     powerpc-apple-darwin5.5 required it. */
57#include <sys/types.h>
58#ifdef HAVE_SYS_SOCKET_H
59#include <sys/socket.h>
60#endif
61#ifdef HAVE_WS2TCPIP_H
62#include <ws2tcpip.h>
63#endif
64])
65  if test $ac_cv_type_struct_sockaddr_storage = no; then
66    HAVE_STRUCT_SOCKADDR_STORAGE=0
67  fi
68  if test $ac_cv_type_sa_family_t = no; then
69    HAVE_SA_FAMILY_T=0
70  fi
71  if test $ac_cv_type_struct_sockaddr_storage != no; then
72    AC_CHECK_MEMBERS([struct sockaddr_storage.ss_family],
73      [],
74      [HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=0],
75      [#include <sys/types.h>
76       #ifdef HAVE_SYS_SOCKET_H
77       #include <sys/socket.h>
78       #endif
79       #ifdef HAVE_WS2TCPIP_H
80       #include <ws2tcpip.h>
81       #endif
82      ])
83  fi
84  if test $HAVE_STRUCT_SOCKADDR_STORAGE = 0 || test $HAVE_SA_FAMILY_T = 0 \
85     || test $HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY = 0; then
86    SYS_SOCKET_H='sys/socket.h'
87  fi
88  gl_PREREQ_SYS_H_WINSOCK2
89
90  dnl Check for declarations of anything we want to poison if the
91  dnl corresponding gnulib module is not in use.
92  gl_WARN_ON_USE_PREPARE([[
93/* Some systems require prerequisite headers.  */
94#include <sys/types.h>
95#include <sys/socket.h>
96    ]], [socket connect accept bind getpeername getsockname getsockopt
97    listen recv send recvfrom sendto setsockopt shutdown accept4])
98
99  AC_REQUIRE([AC_C_RESTRICT])
100])
101
102AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],
103[
104  dnl Check prerequisites of the <sys/socket.h> replacement.
105  AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
106  gl_CHECK_NEXT_HEADERS([sys/socket.h])
107  if test $ac_cv_header_sys_socket_h = yes; then
108    HAVE_SYS_SOCKET_H=1
109  else
110    HAVE_SYS_SOCKET_H=0
111  fi
112  AC_SUBST([HAVE_SYS_SOCKET_H])
113  gl_PREREQ_SYS_H_WS2TCPIP
114])
115
116# Common prerequisites of the <sys/socket.h> replacement and of the
117# <sys/select.h> replacement.
118# Sets and substitutes HAVE_WINSOCK2_H.
119AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2],
120[
121  m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
122  m4_ifdef([gl_SYS_IOCTL_H_DEFAULTS], [AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])])
123  AC_CHECK_HEADERS_ONCE([sys/socket.h])
124  if test $ac_cv_header_sys_socket_h != yes; then
125    dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
126    dnl the check for those headers unconditional; yet cygwin reports
127    dnl that the headers are present but cannot be compiled (since on
128    dnl cygwin, all socket information should come from sys/socket.h).
129    AC_CHECK_HEADERS([winsock2.h])
130  fi
131  if test "$ac_cv_header_winsock2_h" = yes; then
132    HAVE_WINSOCK2_H=1
133    UNISTD_H_HAVE_WINSOCK2_H=1
134    SYS_IOCTL_H_HAVE_WINSOCK2_H=1
135  else
136    HAVE_WINSOCK2_H=0
137  fi
138  AC_SUBST([HAVE_WINSOCK2_H])
139])
140
141# Common prerequisites of the <sys/socket.h> replacement and of the
142# <arpa/inet.h> replacement.
143# Sets and substitutes HAVE_WS2TCPIP_H.
144AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],
145[
146  AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
147  if test $ac_cv_header_sys_socket_h = yes; then
148    HAVE_WS2TCPIP_H=0
149  else
150    if test $ac_cv_header_ws2tcpip_h = yes; then
151      HAVE_WS2TCPIP_H=1
152    else
153      HAVE_WS2TCPIP_H=0
154    fi
155  fi
156  AC_SUBST([HAVE_WS2TCPIP_H])
157])
158
159AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],
160[
161  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
162  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
163  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
164  dnl Define it also as a C macro, for the benefit of the unit tests.
165  gl_MODULE_INDICATOR_FOR_TESTS([$1])
166])
167
168AC_DEFUN([gl_SYS_SOCKET_H_DEFAULTS],
169[
170  GNULIB_SOCKET=0;      AC_SUBST([GNULIB_SOCKET])
171  GNULIB_CONNECT=0;     AC_SUBST([GNULIB_CONNECT])
172  GNULIB_ACCEPT=0;      AC_SUBST([GNULIB_ACCEPT])
173  GNULIB_BIND=0;        AC_SUBST([GNULIB_BIND])
174  GNULIB_GETPEERNAME=0; AC_SUBST([GNULIB_GETPEERNAME])
175  GNULIB_GETSOCKNAME=0; AC_SUBST([GNULIB_GETSOCKNAME])
176  GNULIB_GETSOCKOPT=0;  AC_SUBST([GNULIB_GETSOCKOPT])
177  GNULIB_LISTEN=0;      AC_SUBST([GNULIB_LISTEN])
178  GNULIB_RECV=0;        AC_SUBST([GNULIB_RECV])
179  GNULIB_SEND=0;        AC_SUBST([GNULIB_SEND])
180  GNULIB_RECVFROM=0;    AC_SUBST([GNULIB_RECVFROM])
181  GNULIB_SENDTO=0;      AC_SUBST([GNULIB_SENDTO])
182  GNULIB_SETSOCKOPT=0;  AC_SUBST([GNULIB_SETSOCKOPT])
183  GNULIB_SHUTDOWN=0;    AC_SUBST([GNULIB_SHUTDOWN])
184  GNULIB_ACCEPT4=0;     AC_SUBST([GNULIB_ACCEPT4])
185  HAVE_STRUCT_SOCKADDR_STORAGE=1; AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE])
186  HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY=1;
187                        AC_SUBST([HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY])
188  HAVE_SA_FAMILY_T=1;   AC_SUBST([HAVE_SA_FAMILY_T])
189  HAVE_ACCEPT4=1;       AC_SUBST([HAVE_ACCEPT4])
190])
191