Minor cleanup. Moved code around a bit, to functions, away from main().

This commit is in preparation for importing the Westermo code changes.
Slowly refactoring the finit core into a more modularized unit to be a
bit more maintainable.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

initctl.c

@@ -0,0 +1,92 @@
+/*
+Improved fast init
+
+Copyright (c) 2008 Claudio Matsuoka
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#ifdef LISTEN_INITCTL
+#include <features.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/select.h>         /* According to POSIX.1-2001 */
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "finit.h"
+
+#define INIT_MAGIC		0x03091969
+#define INIT_CMD_RUNLVL		1
+
+struct init_request {
+	int	magic;		/* Magic number			*/
+	int	cmd;		/* What kind of request		*/
+	int	runlevel;	/* Runlevel to change to	*/
+	int	sleeptime;	/* Time between TERM and KILL	*/
+	char	data[368];
+};
+
+/* Standard reboot/shutdown utilities talk to init using /dev/initctl.
+ * We should check if the fifo was recreated and reopen it.
+ */
+void listen_initctl(void)
+{
+	if (!fork()) {
+		int ctl;
+		fd_set fds;
+		struct init_request request;
+
+		mkfifo("/dev/initctl", 0600);
+		ctl = open("/dev/initctl", O_RDONLY);
+
+		while (1) {
+			FD_ZERO(&fds);
+			FD_SET(ctl, &fds);
+			if (select(ctl + 1, &fds, NULL, NULL, NULL) <= 0)
+				continue;
+
+			read(ctl, &request, sizeof(request));
+
+			if (request.magic != INIT_MAGIC)
+				continue;
+
+			if (request.cmd == INIT_CMD_RUNLVL) {
+				switch (request.runlevel) {
+				case '0':
+					shutdown_handler(SIGUSR2);
+					break;
+				case '6':
+					shutdown_handler(SIGUSR1);
+				}
+			}
+		}
+	}
+}
+
+#endif  /* LISTEN_INITCTL */
+
+/**
+ * Local Variables:
+ *  version-control: t
+ *  c-file-style: "linux"
+ * End:
+ */