From 19c6e483982456b9cf78c87b9cf3c90e98d63024 Mon Sep 17 00:00:00 2001
From: Masatake YAMATO <yamato@redhat.com>
Date: Sun, 23 Apr 2023 14:48:46 +0800
Subject: [PATCH] backport fix Fo option

-Fo option is for printing file offset. For regular files,
the option didn't work.
Here is a command session demonstrating the fix:

    # ./lsof -Fo -o0| grep ^o | sort | uniq -c
    90586 o0t0
       87 o0t101
       84 o0t103
    ...

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Reference:https://github.com/lsof-org/lsof/commit/6435e7667cbf5b1a616606aa019892df43f3ade1
Conflict:NA
---
 main.c                          |  4 ++++
 tests/case-20-offset-field.bash | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 tests/case-20-offset-field.bash

diff --git a/main.c b/main.c
index 169e334..9e3bbd8 100644
--- a/main.c
+++ b/main.c
@@ -554,6 +554,10 @@ main(argc, argv)
 
 			    if (i == LSOF_FIX_TERM)
 				Terminator = '\0';
+
+			    if (i == LSOF_FIX_OFFSET)
+				Foffset = 1;
+
 			    break;
 			}
 		    }
diff --git a/tests/case-20-offset-field.bash b/tests/case-20-offset-field.bash
new file mode 100644
index 0000000..a5dc369
--- /dev/null
+++ b/tests/case-20-offset-field.bash
@@ -0,0 +1,24 @@
+name=$(basename $0 .bash)
+lsof=$1
+report=$2
+base=$(pwd)
+
+t=/tmp/lsof-test-reg-file-$$
+p=/tmp/lsof-test-reg-fifo-$$
+
+mkfifo $p
+{
+	printf "%d" 1
+	read < $p &
+} | cat > $t &
+
+r=1
+if [ "$($lsof -Fo $t | grep '^o')" = o0t1 ]; then
+	echo > $p
+	r=0
+fi
+
+rm /tmp/lsof-test-reg-file-$$
+rm /tmp/lsof-test-reg-fifo-$$
+
+exit $r
-- 
2.27.0