*: refactor all the things

Long overdue house cleaning.

The addition of compositing/monitoring overlays in vwm3 pushed vwm well past
what is a reasonable size for a simple thousand line file.  This is a first
step towards restoring sanity in the code, but no behavioral differences are
intended, this is mostly just shuffling around and organizing code.

I expect some performance regressions initially, follow-on commits will make
more improvements to that end as the dust settles.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/launch.c b/src/launch.c
new file mode 100644
index 0000000..123e850
--- /dev/null
+++ b/src/launch.c
@@ -0,0 +1,45 @@
+/*
+ *                                  \/\/\
+ *
+ *  Copyright (C) 2012-2016  Vito Caputo - <vcaputo@gnugeneration.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+	/* launching of external processes / X clients */
+
+#include <stdlib.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "launch.h"
+#include "vwm.h"
+
+#define LAUNCHED_RELATIVE_PRIORITY	10	/* the wm priority plus this is used as the priority of launched processes */
+
+/* launch a child command specified in argv, mode decides if we wait for the child to exit before returning. */
+void vwm_launch(vwm_t *vwm, char **argv, vwm_launch_mode_t mode)
+{
+	/* XXX: in BG mode I double fork and let init inherit the orphan so I don't have to collect the return status */
+	if (mode == VWM_LAUNCH_MODE_FG || !fork()) {
+		if (!fork()) {
+			/* child */
+			setpriority(PRIO_PROCESS, getpid(), vwm->priority + LAUNCHED_RELATIVE_PRIORITY);
+			execvp(argv[0], argv);
+		}
+		if (mode == VWM_LAUNCH_MODE_BG) exit(0);
+	}
+	wait(NULL); /* TODO: could wait for the specific pid, particularly in FG mode ... */
+}