| # socklen.m4 serial 10 |
| dnl Copyright (C) 2005-2007, 2009-2016 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Albert Chin, Windows fixes from Simon Josefsson. |
| |
| dnl Check for socklen_t: historically on BSD it is an int, and in |
| dnl POSIX 1g it is a type of its own, but some platforms use different |
| dnl types for the argument to getsockopt, getpeername, etc.: |
| dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS. |
| dnl So we have to test to find something that will work. |
| |
| AC_DEFUN([gl_TYPE_SOCKLEN_T], |
| [AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])dnl |
| AC_CHECK_TYPE([socklen_t], , |
| [AC_MSG_CHECKING([for socklen_t equivalent]) |
| AC_CACHE_VAL([gl_cv_socklen_t_equiv], |
| [# Systems have either "struct sockaddr *" or |
| # "void *" as the second argument to getpeername |
| gl_cv_socklen_t_equiv= |
| for arg2 in "struct sockaddr" void; do |
| for t in int size_t "unsigned int" "long int" "unsigned long int"; do |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM( |
| [[#include <sys/types.h> |
| #include <sys/socket.h> |
| |
| int getpeername (int, $arg2 *, $t *);]], |
| [[$t len; |
| getpeername (0, 0, &len);]])], |
| [gl_cv_socklen_t_equiv="$t"]) |
| test "$gl_cv_socklen_t_equiv" != "" && break |
| done |
| test "$gl_cv_socklen_t_equiv" != "" && break |
| done |
| ]) |
| if test "$gl_cv_socklen_t_equiv" = ""; then |
| AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) |
| fi |
| AC_MSG_RESULT([$gl_cv_socklen_t_equiv]) |
| AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv], |
| [type to use in place of socklen_t if not defined])], |
| [gl_SOCKET_HEADERS])]) |
| |
| dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find |
| dnl it there too. But on Cygwin, wc2tcpip.h must not be included. Users |
| dnl of this module should use the same include pattern as gl_SOCKET_HEADERS. |
| dnl When you change this macro, keep also in sync: |
| dnl - gl_CHECK_SOCKET_HEADERS, |
| dnl - the Include section of modules/socklen. |
| AC_DEFUN([gl_SOCKET_HEADERS], |
| [ |
| /* <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> |
| #if HAVE_SYS_SOCKET_H |
| # include <sys/socket.h> |
| #elif HAVE_WS2TCPIP_H |
| # include <ws2tcpip.h> |
| #endif |
| ]) |
| |
| dnl Tests for the existence of the header for socket facilities. |
| dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H. |
| dnl This macro must match gl_SOCKET_HEADERS. |
| AC_DEFUN([gl_CHECK_SOCKET_HEADERS], |
| [AC_CHECK_HEADERS_ONCE([sys/socket.h]) |
| if test $ac_cv_header_sys_socket_h = no; then |
| dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make |
| dnl the check for those headers unconditional; yet cygwin reports |
| dnl that the headers are present but cannot be compiled (since on |
| dnl cygwin, all socket information should come from sys/socket.h). |
| AC_CHECK_HEADERS([ws2tcpip.h]) |
| fi |
| ]) |