git: c4be32aabf91 - releng/15.1 - tail(1): Fix -r (reverse) to work on pseudo filesystems

The branch releng/15.1 has been updated by cperciva:

URL: https://cgit.FreeBSD.org/src/commit/?id=c4be32aabf91ec74d95296a3455bb7ed05b50ff5

commit c4be32aabf91ec74d95296a3455bb7ed05b50ff5
Author:     Aaron LI <aly@aaronly.me>
AuthorDate: 2026-03-17 04:53:49 +0000
Commit:     Colin Percival <cperciva@FreeBSD.org>
CommitDate: 2026-05-06 16:30:14 +0000

    tail(1): Fix -r (reverse) to work on pseudo filesystems
    
    Pseudo filesystems (e.g., procfs) advertise a zero file size.
    Fix reverse() to handle such a case similarly as forward() so
    that '-r' works on pseudo filesystems.
    
    Approved by:    re (cperciva)
    Signed-off-by:  Aaron LI <aly@aaronly.me>
    Reviewed by:    pouria, Ricardo Branco <rbranco@suse.de>, des
    Fixes:          1fb3caee7 ("tail: Do not trust st_size if it equals zero.")
    Pull-Request:   https://github.com/freebsd/freebsd-src/pull/2080
    
    (cherry picked from commit 4feeca3193c316c18472cd40f215446fda3bd739)
    (cherry picked from commit 771a65210018c68198ea413df10225e87a0ea909)
---
 usr.bin/tail/reverse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usr.bin/tail/reverse.c b/usr.bin/tail/reverse.c
index 1fa8784dec6d..690101c0b803 100644
--- a/usr.bin/tail/reverse.c
+++ b/usr.bin/tail/reverse.c
@@ -78,7 +78,7 @@ reverse(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp)
 	if (style != REVERSE && off == 0)
 		return;
 
-	if (S_ISREG(sbp->st_mode))
+	if (S_ISREG(sbp->st_mode) && sbp->st_size > 0)
 		r_reg(fp, fn, style, off, sbp);
 	else
 		switch(style) {