+ AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([AC_C_INLINE])
+
+ 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_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])