GTK: implemented --detach|-d option for detaching from controlling terminalmaster-fmsbw-ci

This is useful to launch from a terminal without "blocking" this terminal.
There are tools like nohup and daemonize (BSD) to do the same, but having it
builtin is shorter to write.

1 files changed, 28 insertions, 1 deletions

diff --git a/src/interface-gtk/interface.c b/src/interface-gtk/interface.c
index a86e3fd..32370d9 100644
--- a/src/interface-gtk/interface.c
+++ b/src/interface-gtk/interface.c
@@ -19,6 +19,7 @@
 #include "config.h"
 #endif
 
+#include <stdlib.h>
 #include <string.h>
 #include <signal.h>
 
@@ -27,6 +28,7 @@
 #include <glib/gstdio.h>
 
 #ifdef G_OS_UNIX
+#include <unistd.h>
 #include <glib-unix.h>
 #endif
 
@@ -105,7 +107,7 @@ static struct {
 	/* current document's name or empty string for "(Unnamed)" buffer */
 	teco_string_t info_current;
 
-	gboolean no_csd;
+	gboolean no_csd, detach;
 	gint xembed_id;
 
 	GtkWidget *info_bar_widget;
@@ -132,6 +134,26 @@ static struct {
 void
 teco_interface_init(void)
 {
+#ifdef G_OS_UNIX
+	if (teco_interface.detach) {
+		/*
+		 * NOTE: There is also daemon() on BSD/Linux,
+		 * but the following should be more portable.
+		 */
+		pid_t pid = fork();
+		g_assert(pid >= 0);
+		if (pid != 0)
+			/* parent process */
+			exit(EXIT_SUCCESS);
+
+		setsid();
+
+		g_freopen("/dev/null", "r", stdin);
+		g_freopen("/dev/null", "a+", stdout);
+		g_freopen("/dev/null", "a+", stderr);
+	}
+#endif
+
 	/*
 	 * gtk_init() is not necessary when using gtk_get_option_group(),
 	 * but this will open the default display.
@@ -341,6 +363,11 @@ teco_interface_get_options(void)
 		 G_OPTION_ARG_INT, &teco_interface.xembed_id,
 		 "Embed into an existing X11 Window.", "ID"},
 #endif
+#ifdef G_OS_UNIX
+		{"detach", 'd', G_OPTION_FLAG_IN_MAIN,
+		 G_OPTION_ARG_NONE, &teco_interface.detach,
+		 "Detach from controlling terminal (daemonize).", NULL},
+#endif
 		{NULL}
 	};