Method: File.truncate

Defined in:

file.c

.truncate(file_name, integer) ⇒ 0

Truncates the file file_name to be at most integer bytes long. Not available on all platforms.

f = File.new("out", "w")
f.write("1234567890")     #=> 10
f.close                   #=> nil
File.truncate("out", 5)   #=> 0
File.size("out")          #=> 5

Returns:

• (0)

# File 'file.c', line 5018

static VALUE
rb_file_s_truncate(VALUE klass, VALUE path, VALUE len)
{
    struct truncate_arg ta;
    int r;

    ta.pos = NUM2POS(len);
    FilePathValue(path);
    path = rb_str_encode_ospath(path);
    ta.path = StringValueCStr(path);

    r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_truncate, &ta,
						RUBY_UBF_IO, NULL);
    if (r < 0)
	rb_sys_fail_path(path);
    return INT2FIX(0);
#undef NUM2POS
}