1 files changed, 110 insertions, 0 deletions
diff --git a/busybox/coreutils/watch.c b/busybox/coreutils/watch.c
new file mode 100644
index 0000000..f9f4018
--- /dev/null
+++ b/busybox/coreutils/watch.c
@@ -0,0 +1,110 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini watch implementation for busybox
+ *
+ * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
+ *
+ * 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
+ * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/* BB_AUDIT SUSv3 N/A */
+/* BB_AUDIT GNU defects -- only option -n is supported. */
+
+/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
+ *
+ * Removed dependency on date_main(), added proper error checking, and
+ * reduced size.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <time.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include "busybox.h"
+
+extern int watch_main(int argc, char **argv)
+{
+	const int header_len = 40;
+	time_t t;
+	pid_t pid;
+	unsigned period = 2;
+	int old_stdout;
+	int len, len2;
+	char **watched_argv;
+	char header[header_len + 1];
+
+	if (argc < 2) {
+		bb_show_usage();
+	}
+
+	/* don't use getopt, because it permutes the arguments */
+	++argv;
+	if ((argc > 3) && !strcmp(*argv, "-n")
+	) {
+		period = bb_xgetularg10_bnd(argv[1], 1, UINT_MAX);
+		argv += 2;
+	}
+	watched_argv = argv;
+
+	/* create header */
+
+	len = snprintf(header, header_len, "Every %ds:", period);
+	/* Don't bother checking for len < 0, as it should never happen.
+	 * But, just to be prepared... */
+	assert(len >= 0);
+	do {
+		len2 = strlen(*argv);
+		if (len + len2 >= header_len-1) {
+			break;
+		}
+		header[len] = ' ';
+		memcpy(header+len+1, *argv, len2);
+		len += len2+1;
+	} while (*++argv);
+
+	header[len] = 0;
+
+	/* thanks to lye, who showed me how to redirect stdin/stdout */
+	old_stdout = dup(1);
+
+	while (1) {
+		time(&t);
+		/* Use dprintf to avoid fflush()ing stdout. */
+		if (dprintf(1, "\033[H\033[J%-*s%s\n", header_len, header, ctime(&t)) < 0) {
+			bb_perror_msg_and_die("printf");
+		}
+
+		pid = vfork();	/* vfork, because of ucLinux */
+		if (pid > 0) {
+			//parent
+			wait(0);
+			sleep(period);
+		} else if (0 == pid) {
+			//child
+			close(1);
+			dup(old_stdout);
+			if (execvp(*watched_argv, watched_argv)) {
+				bb_error_msg_and_die("Couldn't run command\n");
+			}
+		} else {
+			bb_error_msg_and_die("Couldn't vfork\n");
+		}
+	}
+}