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# socklen.m4 serial 2
dnl Copyright (C) 2005 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.
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. So we
dnl have to test to find something that will work.
AC_DEFUN([gl_TYPE_SOCKLEN_T],
[AC_CHECK_TYPE([socklen_t], ,
[AC_MSG_CHECKING([for socklen_t equivalent])
AC_CACHE_VAL([gl_cv_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_TRY_COMPILE(
[#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])],
[#include <sys/types.h>
#include <sys/socket.h>])])
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