1 dnl $Id: aclocal.m4,v 1.6 2005/09/19 16:33:39 tim Exp $
3 dnl OpenSSH-specific autoconf macros
7 dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol)
8 dnl Does AC_EGREP_HEADER on 'header' for the string 'field'
9 dnl If found, set 'symbol' to be defined. Cache the result.
10 dnl TODO: This is not foolproof, better to compile and read from there
11 AC_DEFUN(OSSH_CHECK_HEADER_FOR_FIELD, [
12 # look for field '$1' in header '$2'
13 dnl This strips characters illegal to m4 from the header filename
14 ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'`
16 ossh_varname="ossh_cv_$ossh_safe""_has_"$1
17 AC_MSG_CHECKING(for $1 field in $2)
18 AC_CACHE_VAL($ossh_varname, [
19 AC_EGREP_HEADER($1, $2, [ dnl
20 eval "$ossh_varname=yes" dnl
22 eval "$ossh_varname=no" dnl
25 ossh_result=`eval 'echo $'"$ossh_varname"`
26 if test -n "`echo $ossh_varname`"; then
27 AC_MSG_RESULT($ossh_result)
28 if test "x$ossh_result" = "xyes"; then
29 AC_DEFINE($3, 1, [Define if you have $1 in $2])
36 dnl OSSH_PATH_ENTROPY_PROG(variablename, command):
37 dnl Tidiness function, sets 'undef' if not found, and does the AC_SUBST
38 AC_DEFUN(OSSH_PATH_ENTROPY_PROG, [
40 if test -z "[$]$1" ; then
46 dnl Check for socklen_t: historically on BSD it is an int, and in
47 dnl POSIX 1g it is a type of its own, but some platforms use different
48 dnl types for the argument to getsockopt, getpeername, etc. So we
49 dnl have to test to find something that will work.
50 AC_DEFUN([TYPE_SOCKLEN_T],
52 AC_CHECK_TYPE([socklen_t], ,[
53 AC_MSG_CHECKING([for socklen_t equivalent])
54 AC_CACHE_VAL([curl_cv_socklen_t_equiv],
56 # Systems have either "struct sockaddr *" or
57 # "void *" as the second argument to getpeername
58 curl_cv_socklen_t_equiv=
59 for arg2 in "struct sockaddr" void; do
60 for t in int size_t unsigned long "unsigned long"; do
62 #include <sys/types.h>
63 #include <sys/socket.h>
65 int getpeername (int, $arg2 *, $t *);
68 getpeername(0,0,&len);
70 curl_cv_socklen_t_equiv="$t"
76 if test "x$curl_cv_socklen_t_equiv" = x; then
77 AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
80 AC_MSG_RESULT($curl_cv_socklen_t_equiv)
81 AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
82 [type to use in place of socklen_t if not defined])],
83 [#include <sys/types.h>
84 #include <sys/socket.h>])