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authorDenys Vlasenko2012-01-15 22:58:06 +0100
committerDenys Vlasenko2012-01-15 22:58:06 +0100
commit7ce209b9d4f6053b7e6d07dec66e382bc3614c35 (patch)
tree5e4aaaf494f771b61707bc12df849c01ad9e37c0 /shell
parentd29ae7e071a11c51436922654c2de73a8ac36333 (diff)
downloadbusybox-7ce209b9d4f6053b7e6d07dec66e382bc3614c35.zip
busybox-7ce209b9d4f6053b7e6d07dec66e382bc3614c35.tar.gz
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 <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
-rw-r--r--shell/shell_common.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/shell/shell_common.c b/shell/shell_common.c
index bbc22ed..51c92d6 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);