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From 067fbebee46a376c639c9369dcaf80004047414d Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 3 Aug 2015 19:04:08 +0200
Subject: [PATCH] terminal-util: when resetting terminals, don't wait for
carrier
In case of non-CLOCAL lines (i.e. those with carrier detect configured)
we shouldnt wait for a carrier if all we try to do is reset the TTY.
Hence, whenever we open such a TTY pass O_NONBLOCK.
Note that we continue to open ttys we intend to write to without
O_ONBLOCK, we only add it in cases we invoke ioctl()s or other terminal
operations without reading or writing to the device.
Fixes #835.
Cherry-picked from: 0a8b555ceb07ce916b9bd48782d1eb69a12f0f2e
Resolves: #1266745
---
src/shared/util.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/src/shared/util.c b/src/shared/util.c
index 778c2b0e04..50925888df 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -1713,7 +1713,7 @@ bool fstype_is_network(const char *fstype) {
int chvt(int vt) {
_cleanup_close_ int fd;
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return -errno;
@@ -1953,7 +1953,11 @@ finish:
int reset_terminal(const char *name) {
_cleanup_close_ int fd = -1;
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ /* We open the terminal with O_NONBLOCK here, to ensure we
+ * don't block on carrier if this is a terminal with carrier
+ * configured. */
+
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;
@@ -2204,7 +2208,7 @@ int release_terminal(void) {
struct sigaction sa_old;
int r = 0;
- fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
+ fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return -errno;
@@ -4405,7 +4409,7 @@ int terminal_vhangup_fd(int fd) {
int terminal_vhangup(const char *name) {
_cleanup_close_ int fd;
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;
@@ -4452,7 +4456,7 @@ int vt_disallocate(const char *name) {
return -EINVAL;
/* Try to deallocate */
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+ fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0)
return fd;