|
 |
1abbee |
From 067fbebee46a376c639c9369dcaf80004047414d Mon Sep 17 00:00:00 2001
|
|
|
1abbee |
From: Lennart Poettering <lennart@poettering.net>
|
|
|
1abbee |
Date: Mon, 3 Aug 2015 19:04:08 +0200
|
|
|
1abbee |
Subject: [PATCH] terminal-util: when resetting terminals, don't wait for
|
|
|
1abbee |
carrier
|
|
|
1abbee |
|
|
|
1abbee |
In case of non-CLOCAL lines (i.e. those with carrier detect configured)
|
|
|
1abbee |
we shouldnt wait for a carrier if all we try to do is reset the TTY.
|
|
|
1abbee |
Hence, whenever we open such a TTY pass O_NONBLOCK.
|
|
|
1abbee |
|
|
|
1abbee |
Note that we continue to open ttys we intend to write to without
|
|
|
1abbee |
O_ONBLOCK, we only add it in cases we invoke ioctl()s or other terminal
|
|
|
1abbee |
operations without reading or writing to the device.
|
|
|
1abbee |
|
|
|
1abbee |
Fixes #835.
|
|
|
1abbee |
|
|
|
1abbee |
Cherry-picked from: 0a8b555ceb07ce916b9bd48782d1eb69a12f0f2e
|
|
|
1abbee |
Resolves: #1266745
|
|
|
1abbee |
---
|
|
|
1abbee |
src/shared/util.c | 14 +++++++++-----
|
|
|
1abbee |
1 file changed, 9 insertions(+), 5 deletions(-)
|
|
|
1abbee |
|
|
|
1abbee |
diff --git a/src/shared/util.c b/src/shared/util.c
|
|
|
181b3f |
index 778c2b0e0..50925888d 100644
|
|
|
1abbee |
--- a/src/shared/util.c
|
|
|
1abbee |
+++ b/src/shared/util.c
|
|
|
1abbee |
@@ -1713,7 +1713,7 @@ bool fstype_is_network(const char *fstype) {
|
|
|
1abbee |
int chvt(int vt) {
|
|
|
1abbee |
_cleanup_close_ int fd;
|
|
|
1abbee |
|
|
|
1abbee |
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
|
1abbee |
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
|
1abbee |
if (fd < 0)
|
|
|
1abbee |
return -errno;
|
|
|
1abbee |
|
|
|
1abbee |
@@ -1953,7 +1953,11 @@ finish:
|
|
|
1abbee |
int reset_terminal(const char *name) {
|
|
|
1abbee |
_cleanup_close_ int fd = -1;
|
|
|
1abbee |
|
|
|
1abbee |
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
|
1abbee |
+ /* We open the terminal with O_NONBLOCK here, to ensure we
|
|
|
1abbee |
+ * don't block on carrier if this is a terminal with carrier
|
|
|
1abbee |
+ * configured. */
|
|
|
1abbee |
+
|
|
|
1abbee |
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
|
1abbee |
if (fd < 0)
|
|
|
1abbee |
return fd;
|
|
|
1abbee |
|
|
|
1abbee |
@@ -2204,7 +2208,7 @@ int release_terminal(void) {
|
|
|
1abbee |
struct sigaction sa_old;
|
|
|
1abbee |
int r = 0;
|
|
|
1abbee |
|
|
|
1abbee |
- fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
|
|
|
1abbee |
+ fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
|
1abbee |
if (fd < 0)
|
|
|
1abbee |
return -errno;
|
|
|
1abbee |
|
|
|
1abbee |
@@ -4405,7 +4409,7 @@ int terminal_vhangup_fd(int fd) {
|
|
|
1abbee |
int terminal_vhangup(const char *name) {
|
|
|
1abbee |
_cleanup_close_ int fd;
|
|
|
1abbee |
|
|
|
1abbee |
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
|
1abbee |
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
|
1abbee |
if (fd < 0)
|
|
|
1abbee |
return fd;
|
|
|
1abbee |
|
|
|
1abbee |
@@ -4452,7 +4456,7 @@ int vt_disallocate(const char *name) {
|
|
|
1abbee |
return -EINVAL;
|
|
|
1abbee |
|
|
|
1abbee |
/* Try to deallocate */
|
|
|
1abbee |
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
|
|
|
1abbee |
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
|
|
|
1abbee |
if (fd < 0)
|
|
|
1abbee |
return fd;
|
|
|
1abbee |
|