From d1588599c02456200eae5f7fcf7f9d309f7bac8e Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Thu, 30 Apr 2009 01:24:53 +0000
Subject: [PATCH] Report the next directory being scanned when a ^T is pressed
 (or any SIGINFO).  Provides some progress report for the impatient.  This
 won't report that we're blocking in our walk due to disk/network problems,
 however.  There's no really good way to report that condition that I'm aware
 of...

---
 usr.bin/du/du.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/usr.bin/du/du.c b/usr.bin/du/du.c
index f5e7f055b3e4..63677f5f94ce 100644
--- a/usr.bin/du/du.c
+++ b/usr.bin/du/du.c
@@ -77,10 +77,12 @@ static void	prthumanval(int64_t);
 static void	ignoreadd(const char *);
 static void	ignoreclean(void);
 static int	ignorep(FTSENT *);
+static void	siginfo(int __unused);
 
 static int	nodumpflag = 0;
 static int	Aflag;
 static long	blocksize, cblocksize;
+static volatile sig_atomic_t info;
 
 int
 main(int argc, char *argv[])
@@ -248,6 +250,8 @@ main(int argc, char *argv[])
 
 	rval = 0;
 
+	(void)signal(SIGINFO, siginfo);
+
 	if ((fts = fts_open(argv, ftsoptions, NULL)) == NULL)
 		err(1, "fts_open");
 
@@ -278,6 +282,10 @@ main(int argc, char *argv[])
 					    p->fts_path);
 				}
 			}
+			if (info) {
+				info = 0;
+				(void)printf("\t%s\n", p->fts_path);
+			}
 			break;
 		case FTS_DC:			/* Ignore. */
 			break;
@@ -531,3 +539,10 @@ ignorep(FTSENT *ent)
 			return 1;
 	return 0;
 }
+
+static void
+siginfo(int sig __unused)
+{
+
+	info = 1;
+}