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authorPeter Hurley <peter@hurleysoftware.com>2013-06-15 18:21:17 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-24 04:08:40 +0400
commit40d5e0905a03601d40cd4e46b8690093c2355d03 (patch)
tree6562e24794811eb13d986e4ea90a55c82cbdae26 /include/linux/tty.h
parent9dfd16ddea9bdbc8343340e543732db0a467ae32 (diff)
downloadlinux-40d5e0905a03601d40cd4e46b8690093c2355d03.tar.xz
n_tty: Fix EOF push handling
In canonical mode, an EOF which is not the first character of the line causes read() to complete and return the number of characters read so far (commonly referred to as EOF push). However, if the previous read() returned because the user buffer was full _and_ the next character is an EOF not at the beginning of the line, read() must not return 0, thus mistakenly indicating the end-of-file condition. The TTY_PUSH flag is used to indicate an EOF was received which is not at the beginning of the line. Because the EOF push condition is evaluated by a thread other than the read(), multiple EOF pushes can cause a premature end-of-file to be indicated. Instead, discover the 'EOF push as first read character' condition from the read() thread itself, and restart the i/o loop if detected. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty.h')
-rw-r--r--include/linux/tty.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 5fd5d6f1ebc4..554b732d8b55 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -304,7 +304,6 @@ struct tty_file_private {
#define TTY_EXCLUSIVE 3 /* Exclusive open mode */
#define TTY_DEBUG 4 /* Debugging */
#define TTY_DO_WRITE_WAKEUP 5 /* Call write_wakeup after queuing new */
-#define TTY_PUSH 6 /* n_tty private */
#define TTY_CLOSING 7 /* ->close() in progress */
#define TTY_LDISC_OPEN 11 /* Line discipline is open */
#define TTY_PTY_LOCK 16 /* pty private */