--- libptytty/ptytty.m4	2006/01/22 00:58:18	1.2
+++ libptytty/ptytty.m4	2007/05/07 13:46:06	1.9
@@ -17,6 +17,10 @@
   getpt \
   posix_openpt \
   isastream \
+  setuid \
+  seteuid \
+  setreuid \
+  setresuid \
 )
 
 have_clone=no
@@ -76,6 +80,38 @@
 
 AC_DEFUN([UTMP_CHECK],
 [
+support_utmp=yes
+support_wtmp=yes
+support_lastlog=yes
+
+AC_ARG_ENABLE(utmp,
+  [  --enable-utmp           enable utmp (utmpx) support],
+  [if test x$enableval = xyes -o x$enableval = xno; then
+    support_utmp=$enableval
+  fi])
+
+AC_ARG_ENABLE(wtmp,
+  [  --enable-wtmp           enable wtmp (wtmpx) support (requires --enable-utmp)],
+  [if test x$enableval = xyes -o x$enableval = xno; then
+    support_wtmp=$enableval
+  fi])
+
+AC_ARG_ENABLE(lastlog,
+  [  --enable-lastlog        enable lastlog support (requires --enable-utmp)],
+  [if test x$enableval = xyes -o x$enableval = xno; then
+    support_lastlog=$enableval
+  fi])
+
+if test x$support_utmp = xyes; then
+  AC_DEFINE(UTMP_SUPPORT, 1, Define if you want to have utmp/utmpx support)
+fi
+if test x$support_wtmp = xyes; then
+  AC_DEFINE(WTMP_SUPPORT, 1, Define if you want to have wtmp support when utmp/utmpx is enabled)
+fi
+if test x$support_lastlog = xyes; then
+  AC_DEFINE(LASTLOG_SUPPORT, 1, Define if you want to have lastlog support when utmp/utmpx is enabled)
+fi
+
 AC_CHECK_FUNCS( \
 	ttyslot \
 	updwtmp \
@@ -178,6 +214,7 @@
 dnl# find utmp
 AC_CACHE_CHECK(where utmp is located, path_utmp,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <utmp.h>
 #include <errno.h>
@@ -214,6 +251,7 @@
 dnl# a day newer, then dump the utmpx.  People leave lots of junk around.
 AC_CACHE_CHECK(where utmpx is located, path_utmpx,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <utmpx.h>
 #include <errno.h>
@@ -259,6 +297,7 @@
 dnl# find wtmp
 AC_CACHE_CHECK(where wtmp is located, path_wtmp,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #ifdef HAVE_UTMP_H
 #include <utmp.h>
@@ -295,6 +334,7 @@
 dnl# find wtmpx
 AC_CACHE_CHECK(where wtmpx is located, path_wtmpx,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #ifdef HAVE_UTMPX_H
 #include <utmpx.h>
 #endif
@@ -330,6 +370,7 @@
 dnl# find lastlog
 AC_CACHE_CHECK(where lastlog is located, path_lastlog,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #ifdef HAVE_UTMPX_H
 #include <utmpx.h>
@@ -373,6 +414,7 @@
 dnl# find lastlogx
 AC_CACHE_CHECK(where lastlogx is located, path_lastlogx,
 [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
+#include <stdlib.h>
 #ifdef HAVE_UTMPX_H
 #include <utmpx.h>
 #endif
@@ -408,7 +450,7 @@
 [
 AC_CACHE_CHECK(for unix-compliant filehandle passing ability, can_pass_fds,
 [AC_TRY_LINK([
-#include <cstddef> // broken bsds (is that redundant) need this
+#include <cstddef> // broken bsds (is that redundant?) need this
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
@@ -443,3 +485,33 @@
    AC_MSG_ERROR([libptytty requires unix-compliant filehandle passing ability])
 fi
 ])
+
+AC_DEFUN([TTY_GROUP_CHECK],
+[
+AC_CACHE_CHECK([for tty group], tty_group,
+[AC_TRY_RUN([
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <grp.h>
+
+main()
+{
+  struct stat st;
+  struct group *gr;
+  char *tty;
+  gr = getgrnam("tty");
+  tty = ttyname(0);
+  if (gr != 0
+      && tty != 0
+      && (stat(tty, &st)) == 0
+      && st.st_gid == gr->gr_gid)
+    return 0;
+  else
+    return 1;
+}],
+[tty_group=yes],[tty_group=no],[tty_group=no])])
+if test x$tty_group = xyes; then
+  AC_DEFINE(TTY_GID_SUPPORT, 1, "")
+fi])
+