Re^4: Newline vs Return

That's not quite true. Only STDOUT is line-buffered by default. In fact, only STDOUT is ever line-buffered(*). I verified this with the following snippet:

perl -e "open(FH, q{>test}); print FH (qq{a\n}); sleep(5); print FH (q
+q{a\n});"
[download]

The lines only appeared after the 5 seconds were over.

(*) Maybe XS or PerlIO can change this? Of course, tie could.

Comment on Re^4: Newline vs Return Select or Download Code

Replies are listed 'Best First'.
Re^5: Newline vs Return by sgifford (Prior) on Oct 07, 2005 at 21:27 UTC
Actually, any filehandle connected to a TTY is line buffered; this is stdio's default. If you connect STDOUT to something other than a TTY, it will be block buffered like any other filehandle. For example (on Unix, not sure what a TTY on Windows is): `perl -e "open(FH, q{>/dev/tty}); print FH (qq{a\n}); sleep(5); print F +H (qq{a\n});"` [download] In older versions of Perl you could get line buffering with IO::Handle's `setvbuf` method, but it looks like that's no longer supported. See the stdio function `isatty` and perl's `-t` test for more information about how a TTY is detected.	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^5: Newline vs Return
by sgifford (Prior) on Oct 07, 2005 at 21:27 UTC

perl -e "open(FH, q{>/dev/tty}); print FH (qq{a\n}); sleep(5); print F
+H (qq{a\n});"
[download]

In older versions of Perl you could get line buffering with IO::Handle's setvbuf method, but it looks like that's no longer supported.

See the stdio function isatty and perl's -t test for more information about how a TTY is detected.

[reply]
[d/l]
[select]