From 7ce209b9d4f6053b7e6d07dec66e382bc3614c35 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 15 Jan 2012 22:58:06 +0100 Subject: shell_builtin_read: set cc[VMIN] to 1; lineedit: don't clear c_cc[VINTR] First change fixes "read -n NUM". Apparently poll() won't report data availability if cc[VMIN] > 1 until there are at least cc[VMIN] bytes. function old new delta read_line_input 3885 3877 -8 shell_builtin_read 1097 1087 -10 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-18) Total: -18 bytes Signed-off-by: Denys Vlasenko --- shell/shell_common.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'shell/shell_common.c') diff --git a/shell/shell_common.c b/shell/shell_common.c index bbc22ed34..51c92d60e 100644 --- a/shell/shell_common.c +++ b/shell/shell_common.c @@ -138,7 +138,13 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val), old_tty = tty; if (nchars) { tty.c_lflag &= ~ICANON; - tty.c_cc[VMIN] = nchars < 256 ? nchars : 255; + // Setting it to more than 1 breaks poll(): + // it blocks even if there's data. !?? + //tty.c_cc[VMIN] = nchars < 256 ? nchars : 255; + /* reads would block only if < 1 char is available */ + tty.c_cc[VMIN] = 1; + /* no timeout (reads block forever) */ + tty.c_cc[VTIME] = 0; } if (read_flags & BUILTIN_READ_SILENT) { tty.c_lflag &= ~(ECHO | ECHOK | ECHONL); -- cgit v1.2.3