End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
FileTest#blockdev?
File.blockdev?(file_name) → true or false
file.c
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static VALUE
rb_file_blockdev_p(VALUE obj, VALUE fname)
{
#ifndef S_ISBLK
# ifdef S_IFBLK
# define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
# else
# define S_ISBLK(m) (0) /* anytime false */
# endif
#endif
#ifdef S_ISBLK
struct stat st;
if (rb_stat(fname, &st) < 0) return Qfalse;
if (S_ISBLK(st.st_mode)) return Qtrue;
#endif
return Qfalse;
}
Returns true if the named file is a block device.
file_name can be an IO object.