build-sys: check for POSIX utmpx usage

We simply check for utmpxname and updwtmpx functions to disable
all programs which are not POSIX utmpx compatible, even though
last(1) and utmpdump(1) does not use them, see below.

utmpx.h is used in:
  login agetty write lslogins last runuser su utmpdump wall

Non-Posix utmpx usage:
   utmpxname        -> login agetty write lslogins
   updwtmpx         -> login agetty                     runuser su
   _PATH_.TMP       -> login agetty write lslogins last runuser su
   utmpx.ut_addr_v6 -> login                       last            utmpdump

POSIX utmpx usage:
   wall

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

diff --git a/configure.ac b/configure.ac
index bfcd218a73e4122d1023e379c8f7e084ba93becf..afb255e93ad223d490229fd4cddadda3475c001f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -424,6 +424,7 @@ AC_CHECK_FUNCS([futimens], [have_futimens=yes])
 AC_CHECK_FUNCS([inotify_init1], [have_inotify_init1=yes])
 AC_CHECK_FUNCS([open_memstream], [have_open_memstream=yes],[have_open_memstream=no])
 AC_CHECK_FUNCS([reboot], [have_reboot=yes],[have_reboot=no])
+AC_CHECK_FUNCS([updwtmpx updwtmpx], [have_gnu_utmpx=yes], [have_gnu_utmpx=no])
 
 AM_CONDITIONAL([HAVE_OPENAT], [test "x$have_openat" = xyes])
 
@@ -1244,6 +1245,7 @@ AC_ARG_ENABLE([agetty],
 )
 UL_BUILD_INIT([agetty])
 UL_REQUIRES_HAVE([agetty], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([agetty], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_AGETTY], [test "x$build_agetty" = xyes])
 AS_IF([test "x$have_futimens" = xyes -a "x$have_inotify_init1" = xyes ], [
   AC_DEFINE([AGETTY_RELOAD], [1], [Enable agetty --reload feature])
@@ -1365,6 +1367,7 @@ UL_BUILD_INIT([lslogins])
 UL_REQUIRES_BUILD([lslogins], [libsmartcols])
 UL_REQUIRES_HAVE([lslogins], [shadow_h], [shadow.h header])
 UL_REQUIRES_HAVE([lslogins], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([lslogins], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_LSLOGINS], [test "x$build_lslogins" = xyes])
 
 
@@ -1615,6 +1618,7 @@ AC_ARG_ENABLE([last],
 )
 UL_BUILD_INIT([last])
 UL_REQUIRES_HAVE([last], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([last], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_LAST], [test "x$build_last" = xyes])
 
 
@@ -1624,6 +1628,7 @@ AC_ARG_ENABLE([utmpdump],
 )
 UL_BUILD_INIT([utmpdump])
 UL_REQUIRES_HAVE([utmpdump], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([utmpdump], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_UTMPDUMP], [test "x$build_utmpdump" = xyes])
 
 
@@ -1743,6 +1748,7 @@ UL_BUILD_INIT([login])
 UL_REQUIRES_HAVE([login], [security_pam_appl_h], [PAM header file])
 UL_REQUIRES_HAVE([login], [security_pam_misc_h, security_openpam_h], [PAM conversation functions])
 UL_REQUIRES_HAVE([login], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([login], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_LOGIN], [test "x$build_login" = xyes])
 
 AC_ARG_ENABLE([login-chown-vcs],
@@ -1788,6 +1794,7 @@ AC_ARG_ENABLE([su],
 UL_BUILD_INIT([su])
 UL_REQUIRES_HAVE([su], [security_pam_appl_h], [PAM header file])
 UL_REQUIRES_HAVE([su], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([su], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_SU], [test "x$build_su" = xyes])
 
 
@@ -1798,6 +1805,7 @@ AC_ARG_ENABLE([runuser],
 UL_BUILD_INIT([runuser])
 UL_REQUIRES_HAVE([runuser], [security_pam_appl_h], [PAM header file])
 UL_REQUIRES_HAVE([runuser], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([runuser], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_RUNUSER], [test "x$build_runuser" = xyes])
 
 
@@ -1911,6 +1919,7 @@ AC_ARG_ENABLE([write],
 )
 UL_BUILD_INIT([write])
 UL_REQUIRES_HAVE([write], [utmpx_h], [utmpx.h header])
+UL_REQUIRES_HAVE([write], [gnu_utmpx], [GNU utmpx fucntions])
 AM_CONDITIONAL([BUILD_WRITE], [test "x$build_write" = xyes])