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tty: Set dependencies between masters, slaves and ctty

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Firstly masters, then slaves and lastly ctty.

v4: New

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Kirill Tkhai
2017-01-18 14:58:30 +03:00
committed by Pavel Emelyanov
parent a14eedc22d
commit 3432e9891c
1 changed files with 37 additions and 1 deletions
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38
criu/tty.c
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@@ -1097,6 +1097,38 @@ static int open_ext_tty(struct tty_info *info)
return fd;
}
static bool tty_deps_restored(struct tty_info *info)
{
struct list_head *list = &rsti(current)->used;
struct fdinfo_list_entry *fle;
struct tty_info *tmp;
if (info->driver->type == TTY_TYPE__CTTY) {
list_for_each_entry(fle, list, used_list) {
if (fle->desc->ops->type != FD_TYPES__TTY || fle->desc == &info->d)
continue;
/* ctty needs all others are restored */
if (fle->stage != FLE_RESTORED)
return false;
}
} else if (!tty_is_master(info)) {
list_for_each_entry(fle, list, used_list) {
if (fle->desc->ops->type != FD_TYPES__TTY || fle->desc == &info->d)
continue;
tmp = container_of(fle->desc, struct tty_info, d);
/* slaves wait for masters except ctty */
if (tmp->driver->type == TTY_TYPE__CTTY ||
!tty_is_master(tmp))
continue;
if (fle->stage != FLE_RESTORED)
return false;
}
}
return true;
}
static int tty_open(struct file_desc *d, int *new_fd)
{
struct tty_info *info = container_of(d, struct tty_info, d);
@@ -1106,7 +1138,11 @@ static int tty_open(struct file_desc *d, int *new_fd)
if (!info->create)
return receive_tty(info, new_fd);
else if (is_pty(info->driver) && !tty_is_master(info))
if (!tty_deps_restored(info))
return 1;
if (is_pty(info->driver) && !tty_is_master(info))
ret = pty_open_unpaired_slave(d, info);
else
ret = info->driver->open(info);