Make sure that st_blksize is greater than 0

2 files changed, 4 insertions, 1 deletions

diff --git a/inotail.c b/inotail.c
index 441db98..53101a8 100644
--- a/inotail.c
+++ b/inotail.c
@@ -565,7 +565,8 @@ static int tail_file(struct file_struct *f, unsigned long n_units, mode_t mode,
 	}
 
 	f->size = finfo.st_size;
-	f->blksize = finfo.st_blksize;	/* TODO: Can this value be 0? */
+	if (likely(finfo.st_blksize > 0))
+		f->blksize = finfo.st_blksize;
 
 	if (mode == M_LINES)
 		offset = lines_to_offset(f, n_units);
diff --git a/inotail.h b/inotail.h
index c733943..d483e02 100644
--- a/inotail.h
+++ b/inotail.h
@@ -38,8 +38,10 @@ struct file_struct {
 #define is_digit(c) ((c) >= '0' && (c) <= '9')
 
 #ifdef __GNUC__
+# define likely(x) __builtin_expect(!!(x), 1)
 # define unlikely(x) __builtin_expect(!!(x), 0)
 #else
+# define likely(x) (x)
 # define unlikely(x) (x)
 #endif /* __GNUC__ */