diff options
| -rw-r--r-- | io.c | 23 |
1 files changed, 21 insertions, 2 deletions
@@ -908,12 +908,31 @@ io_getc(OpenFile *fptr) * ios.eof => true or false * ios.eof? => true or false * - * Returns true if <em>ios</em> is at end of file. The stream must be - * opened for reading or an <code>IOError</code> will be raised. + * Returns true if <em>ios</em> is at end of file that means + * there are no more data to read. + * The stream must be opened for reading or an <code>IOError</code> will be + * raised. * * f = File.new("testfile") * dummy = f.readlines * f.eof #=> true + * + * If <em>ios</em> is a stream such as pipe or socket, <code>IO#eof?</code> + * blocks until the other end sends some data or closes it. + * + * r, w = IO.pipe + * Thread.new { sleep 1; w.close } + * r.eof? #=> true after 1 second blocking + * + * r, w = IO.pipe + * Thread.new { sleep 1; w.puts "a" } + * r.eof? #=> false after 1 second blocking + * + * r, w = IO.pipe + * r.eof? # blocks forever + * + * Note that <code>IO#eof?</code> reads data to a input buffer. + * So <code>IO#sysread</code> doesn't work with <code>IO#eof?</code>. */ VALUE |