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authorPeter Hurley <peter@hurleysoftware.com>2014-10-17 00:54:22 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-06 05:53:54 +0300
commit352f86187e1d3e9e27d3be237103dc83a48f882c (patch)
treef5520a81db4238fdc4852f4b411ca78431d1118a /include/uapi/linux/tty_flags.h
parent904326ecac022ebaeb39cdfb206fd3b6551cdfca (diff)
downloadlinux-352f86187e1d3e9e27d3be237103dc83a48f882c.tar.xz
tty: Document defunct ASYNC_* bits in uapi header
Note the serial_struct flags for which the kernel ignores and performs no action. The flags cannot be removed since they form part of the userspace interface via the TIOCSSERIAL/TIOCGSERIAL ioctls. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/uapi/linux/tty_flags.h')
-rw-r--r--include/uapi/linux/tty_flags.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/include/uapi/linux/tty_flags.h b/include/uapi/linux/tty_flags.h
index 7b516f7ee7e6..4e021e31c219 100644
--- a/include/uapi/linux/tty_flags.h
+++ b/include/uapi/linux/tty_flags.h
@@ -8,6 +8,7 @@
* Define ASYNCB_* for convenient use with {test,set,clear}_bit.
*
* Bits [0..ASYNCB_LAST_USER] are userspace defined/visible/changeable
+ * [x] in the bit comments indicates the flag is defunct and no longer used.
*/
#define ASYNCB_HUP_NOTIFY 0 /* Notify getty on hangups and closes
* on the callout port */
@@ -19,15 +20,15 @@
#define ASYNCB_SKIP_TEST 6 /* Skip UART test during autoconfiguration */
#define ASYNCB_AUTO_IRQ 7 /* Do automatic IRQ during
* autoconfiguration */
-#define ASYNCB_SESSION_LOCKOUT 8 /* Lock out cua opens based on session */
-#define ASYNCB_PGRP_LOCKOUT 9 /* Lock out cua opens based on pgrp */
-#define ASYNCB_CALLOUT_NOHUP 10 /* Don't do hangups for cua device */
+#define ASYNCB_SESSION_LOCKOUT 8 /* [x] Lock out cua opens based on session */
+#define ASYNCB_PGRP_LOCKOUT 9 /* [x] Lock out cua opens based on pgrp */
+#define ASYNCB_CALLOUT_NOHUP 10 /* [x] Don't do hangups for cua device */
#define ASYNCB_HARDPPS_CD 11 /* Call hardpps when CD goes high */
#define ASYNCB_SPD_SHI 12 /* Use 230400 instead of 38400 bps */
#define ASYNCB_LOW_LATENCY 13 /* Request low latency behaviour */
#define ASYNCB_BUGGY_UART 14 /* This is a buggy UART, skip some safety
* checks. Note: can be dangerous! */
-#define ASYNCB_AUTOPROBE 15 /* Port was autoprobed by PCI or PNP code */
+#define ASYNCB_AUTOPROBE 15 /* [x] Port was autoprobed by PCI/PNP code */
#define ASYNCB_MAGIC_MULTIPLIER 16 /* Use special CLK or divisor */
#define ASYNCB_LAST_USER 16