core: add binary weechat-headless to run WeeChat without interface (closes #1120)

The optional command line option "--daemon" runs WeeChat like a daemon
(fork, new process group, file descriptors closed).

1 files changed, 125 insertions, 0 deletions

diff --git a/src/gui/curses/headless/main.c b/src/gui/curses/headless/main.c
new file mode 100644
index 000000000..481177020
--- /dev/null
+++ b/src/gui/curses/headless/main.c
@@ -0,0 +1,125 @@
+/*
+ * main.c - entry point for headless mode (no GUI)
+ *
+ * Copyright (C) 2003-2018 Sébastien Helleu <flashcode@flashtux.org>
+ *
+ * This file is part of WeeChat, the extensible chat client.
+ *
+ * WeeChat is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * WeeChat 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 WeeChat.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../../../core/weechat.h"
+#include "../../gui-main.h"
+#include "../gui-curses.h"
+
+
+/*
+ * Daemonizes the process.
+ */
+
+void
+daemonize ()
+{
+    pid_t pid;
+    int fd, i;
+
+    printf (_("Running WeeChat in background..."));
+    printf (" ");
+
+    pid = fork();
+
+    if (pid < 0)
+    {
+        printf (_("fork error"));
+        printf ("\n");
+        exit (EXIT_FAILURE);
+    }
+
+    if (pid > 0)
+    {
+        /* parent process */
+        printf (_("OK"));
+        printf ("\n");
+        exit (EXIT_SUCCESS);
+    }
+
+    /* child process */
+
+    /* obtain a new process group */
+    setsid ();
+
+    /* close all file descriptors */
+    for (i = getdtablesize(); i >= 0; --i)
+    {
+        close (i);
+    }
+    fd = open ("/dev/null", O_RDWR);
+    dup (fd);
+    dup (fd);
+}
+
+/*
+ * Entry point for WeeChat in headless mode (no GUI).
+ */
+
+int
+main (int argc, char *argv[])
+{
+    int i, daemon;
+
+    weechat_init_gettext ();
+
+    /*
+     * Enable a special "headless" mode, where some things are slightly
+     * different, for example:
+     * - no read of stdin (keyboard/mouse)
+     * - don't catch any terminal related signal
+     */
+    weechat_headless = 1;
+
+    /*
+     * If "--daemon" is received in command line arguments,
+     * daemonize the process.
+     */
+    daemon = 0;
+    for (i = 1; i < argc; i++)
+    {
+        if (strcmp (argv[i], "--daemon") == 0)
+        {
+            daemon = 1;
+            break;
+        }
+    }
+    if (daemon)
+        daemonize ();
+
+    /* init, main loop and end */
+    weechat_init (argc, argv, &gui_main_init);
+    gui_main_loop ();
+    weechat_end (&gui_main_end);
+
+    return EXIT_SUCCESS;
+}