1# socklen.m4 serial 4 2dnl Copyright (C) 2005, 2006 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 Albert Chin, Windows fixes from Simon Josefsson. 8 9dnl Check for socklen_t: historically on BSD it is an int, and in 10dnl POSIX 1g it is a type of its own, but some platforms use different 11dnl types for the argument to getsockopt, getpeername, etc. So we 12dnl have to test to find something that will work. 13 14dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find 15dnl it there first. That file is included by gnulib's socket_.h, which 16dnl all users of this module should include. Cygwin must not include 17dnl ws2tcpip.h. 18AC_DEFUN([gl_TYPE_SOCKLEN_T], 19 [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl 20 AC_CHECK_TYPE([socklen_t], , 21 [AC_MSG_CHECKING([for socklen_t equivalent]) 22 AC_CACHE_VAL([gl_cv_gl_cv_socklen_t_equiv], 23 [# Systems have either "struct sockaddr *" or 24 # "void *" as the second argument to getpeername 25 gl_cv_socklen_t_equiv= 26 for arg2 in "struct sockaddr" void; do 27 for t in int size_t "unsigned int" "long int" "unsigned long int"; do 28 AC_TRY_COMPILE( 29 [#include <sys/types.h> 30 #include <sys/socket.h> 31 32 int getpeername (int, $arg2 *, $t *);], 33 [$t len; 34 getpeername (0, 0, &len);], 35 [gl_cv_socklen_t_equiv="$t"]) 36 test "$gl_cv_socklen_t_equiv" != "" && break 37 done 38 test "$gl_cv_socklen_t_equiv" != "" && break 39 done 40 ]) 41 if test "$gl_cv_socklen_t_equiv" = ""; then 42 AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) 43 fi 44 AC_MSG_RESULT([$gl_cv_socklen_t_equiv]) 45 AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv], 46 [type to use in place of socklen_t if not defined])], 47 [#include <sys/types.h> 48 #if HAVE_SYS_SOCKET_H 49 # include <sys/socket.h> 50 #elif HAVE_WS2TCPIP_H 51 # include <ws2tcpip.h> 52 #endif])]) 53