1dnl -- The following is base of curl's acinclude.m4 -- 2dnl Check for socklen_t: historically on BSD it is an int, and in 3dnl POSIX 1g it is a type of its own, but some platforms use different 4dnl types for the argument to getsockopt, getpeername, etc. So we 5dnl have to test to find something that will work. 6AC_DEFUN([AX_TYPE_SOCKLEN_T], [ 7 AC_CHECK_TYPE( 8 [socklen_t], 9 , 10 [ 11 AS_VAR_PUSHDEF([VAR],[ax_cv_socklen_t_equiv])dnl 12 AC_CACHE_CHECK( 13 [for socklen_t equivalent], 14 [VAR], 15 [ 16 #AS_CASE is not supported on <autoconf-2.60 17 case "${host}" in 18 *-mingw*) VAR=int ;; 19 *) 20 # Systems have either "struct sockaddr *" or 21 # "void *" as the second argument to getpeername 22 for arg2 in "struct sockaddr" void; do 23 for t in int size_t unsigned long "unsigned long"; do 24 AC_COMPILE_IFELSE( 25 [AC_LANG_PROGRAM( 26 [[ 27#include <sys/types.h> 28#include <sys/socket.h> 29int getpeername (int, $arg2 *, $t *); 30 ]], 31 [[ 32$t len; 33getpeername(0,0,&len); 34 ]] 35 )], 36 [VAR="$t"; break] 37 ) 38 done 39 test -n "$VAR" && break 40 done 41 ;; 42 esac 43 ] 44 AS_VAR_IF( 45 [VAR], 46 [], 47 [AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])], 48 [AC_DEFINE_UNQUOTED( 49 [socklen_t], 50 [$VAR], 51 [type to use in place of socklen_t if not defined] 52 )] 53 ) 54 ) 55 ], 56 [[ 57#include <sys/types.h> 58#ifdef WIN32 59#include <ws2tcpip.h> 60#else 61#include <sys/socket.h> 62#endif 63 ]] 64 ) 65]) 66