utmp: add suppport for FreeBSD

FreeBSD does not have utempter helper but instead have a ulog-helper
which provides the same set of functionnality, but the call and
arguments are slightly different.

doc/foot.ini.5.scd

@@ -344,8 +344,10 @@ empty string to be set, but it must be quoted: *KEY=""*)
 	some cases, the number of physical _cores_ is better.
 
 *utempter*
-	Path to utempter helper binary. Set to *none* to disable utmp
+	Path to _@utempter_name@_ helper binary. Set to *none* to disable utmp
 	records. Default: _@utempter@_.
+	Foot will execute the binary with _@utempter_add@_ when starting
+	and with _@utempter_del@_ when exiting.
 
 # SECTION: environment
 

doc/meson.build

@@ -4,6 +4,7 @@ scdoc_prog = find_program(scdoc.get_variable('scdoc'), native: true)
 
 if utempter_path == ''
   default_utempter_value = 'not set'
+  utempter_name = 'none'
 else
   default_utempter_value = utempter_path
 endif
@@ -12,6 +13,9 @@ conf_data = configuration_data(
   {
     'default_terminfo': get_option('default-terminfo'),
     'utempter': default_utempter_value,
+    'utempter_name': utempter_name,
+    'utempter_add': utempter_add,
+    'utempter_del': utempter_del,
   }
 )
 

meson.build

@@ -18,28 +18,40 @@ endif
 
 utempter_path = get_option('default-utempter-path')
 if utempter_path == ''
-  utempter = find_program(
+  host_system = host_machine.system()
-    'utempter',
+  if host_system == 'linux'
-    required: false,
+    utempter_path = join_paths(get_option('libdir'),'/utempter/utempter')
-    dirs: [join_paths(get_option('prefix'), get_option('libdir'), 'utempter'),
+    utempter_add = 'add'
-           join_paths(get_option('prefix'), get_option('libexecdir'), 'utempter'),
+    utempter_name = 'utempter'
-           '/usr/lib/utempter',
+    utempter_del_arguments = true
-           '/usr/libexec/utempter',
+    utempter_del = 'del'
-           '/lib/utempter']
+  elif host_system == 'freebsd'
-  )
+    utempter_path = '/usr/libexec/ulog-helper'
-  if utempter.found()
+    utempter_name = 'ulog-helper'
-    utempter_path = utempter.full_path()
+    utempter_add = 'login'
+    utempter_del_arguments = false
+    utempter_del = 'logout'
   else
     utempter_path = ''
+    utempter_add = ''
+    utempter_del = ''
+    utempter_del_arguments = false
   endif
 elif utempter_path == 'none'
   utempter_path = ''
+  utempter_add = ''
+  utempter_del = ''
+  utempter_del_arguments = false
 endif
 
 add_project_arguments(
   ['-D_GNU_SOURCE=200809L',
    '-DFOOT_DEFAULT_TERM="@0@"'.format(get_option('default-terminfo')),
+   '-DFOOT_UTEMPTER_ADD="@0@"'.format(utempter_add),
+   '-DFOOT_UTEMPTER_DEL="@0@"'.format(utempter_del),
    '-DFOOT_DEFAULT_UTEMPTER_PATH="@0@"'.format(utempter_path)] +
+  (utempter_del_arguments
+    ? [ '-DFOOT_UTEMPTER_DEL_ARGUMENTS' ] : []) +
   (is_debug_build
     ? ['-D_DEBUG']
    : [cc.get_supported_arguments('-fno-asynchronous-unwind-tables')]) +

terminal.c

@@ -212,19 +212,24 @@ add_utmp_record(const struct config *conf, struct reaper *reaper, int ptmx)
     if (conf->utempter_path == NULL)
         return true;
 
-    char *const argv[] = {conf->utempter_path, "add", getenv("WAYLAND_DISPLAY"), NULL};
+    char *const argv[] = {conf->utempter_path, FOOT_UTEMPTER_ADD, getenv("WAYLAND_DISPLAY"), NULL};
     return spawn(reaper, NULL, argv, ptmx, ptmx, -1, NULL);
+
 }
 
 static bool
 del_utmp_record(const struct config *conf, struct reaper *reaper, int ptmx)
 {
+    char *arg1 = NULL;
     if (ptmx < 0)
         return true;
     if (conf->utempter_path == NULL)
         return true;
+#ifdef FOOT_UTEMPTER_DEL_ARGUMENTS
+    arg1 = getenv("WAYLAD_DISPLAY");
+#endif
 
-    char *const argv[] = {conf->utempter_path, "del", getenv("WAYLAND_DISPLAY"), NULL};
+    char *const argv[] = {conf->utempter_path, FOOT_UTEMPTER_DEL, arg1, NULL};
     return spawn(reaper, NULL, argv, ptmx, ptmx, -1, NULL);
 }