[cmdline] Add "sync" command

Add "sync" command (loosely based on the Unix "sync"), which will wait
for any pending operations to complete.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/config/config.c

@@ -241,6 +241,9 @@ REQUIRE_OBJECT ( reboot_cmd );
 #ifdef CPUID_CMD
 REQUIRE_OBJECT ( cpuid_cmd );
 #endif
+#ifdef SYNC_CMD
+REQUIRE_OBJECT ( sync_cmd );
+#endif
 
 /*
  * Drag in miscellaneous objects

src/config/general.h

@@ -117,6 +117,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define SANBOOT_CMD		/* SAN boot commands */
 #define MENU_CMD		/* Menu commands */
 #define LOGIN_CMD		/* Login command */
+#define SYNC_CMD		/* Sync command */
 //#define TIME_CMD		/* Time commands */
 //#define DIGEST_CMD		/* Image crypto digest commands */
 //#define LOTEST_CMD		/* Loopback testing commands */

src/hci/commands/sync_cmd.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program 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 2 of the
+ * License, or any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <string.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <ipxe/command.h>
+#include <ipxe/parseopt.h>
+#include <ipxe/timer.h>
+#include <ipxe/pending.h>
+
+/** @file
+ *
+ * "sync" command
+ *
+ */
+
+/** "sync" options */
+struct sync_options {
+	/** Timeout */
+	unsigned int timeout;
+};
+
+/** "sync" option list */
+static struct option_descriptor sync_opts[] = {
+	OPTION_DESC ( "timeout", 't', required_argument,
+		      struct sync_options, timeout, parse_integer ),
+};
+
+/** "sync" command descriptor */
+static struct command_descriptor sync_cmd =
+	COMMAND_DESC ( struct sync_options, sync_opts, 0, 0,
+		       "[--timeout <timeout>]" );
+
+/**
+ * "sync" command
+ *
+ * @v argc		Argument count
+ * @v argv		Argument list
+ * @ret rc		Return status code
+ */
+static int sync_exec ( int argc, char **argv ) {
+	struct sync_options opts;
+	unsigned long timeout;
+	int rc;
+
+	/* Parse options */
+	if ( ( rc = parse_options ( argc, argv, &sync_cmd, &opts ) ) != 0 )
+		return rc;
+
+	/* Wait for pending operations to complete */
+	timeout = ( ( opts.timeout * TICKS_PER_SEC ) / 1000 );
+	if ( ( rc = pending_wait ( timeout ) ) != 0 ) {
+		printf ( "Operations did not complete: %s\n", strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/** Sync commands */
+struct command sync_command __command = {
+	.name = "sync",
+	.exec = sync_exec,
+};