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restore: reserve the service descriptor for a control tty

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I'm really lucky.

prepare_ctl_tty:
	e->fd           = get_service_fd(CTL_TTY_OFF); // -1 as fd is not set

send_fd_to_self:
if (dup2(fd, dfd) != dfd) { // tries to install sfd, but -1 == -1

tty_restore_ctl_terminal:
	if (!is_service_fd(fd, CTL_TTY_OFF))
		return fd == get_service_fd(type); // -1 = -1

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2013-03-18 23:04:09 +04:00
committed by Pavel Emelyanov
parent a9ac1b29b4
commit bce89dba4b
3 changed files with 12 additions and 1 deletions
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10
util.c
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@@ -296,6 +296,16 @@ static int __get_service_fd(enum sfd_type type, int service_fd_id)
static DECLARE_BITMAP(sfd_map, SERVICE_FD_MAX);
int reserve_service_fd(enum sfd_type type)
{
int sfd = __get_service_fd(type, service_fd_id);
BUG_ON((int)type <= SERVICE_FD_MIN || (int)type >= SERVICE_FD_MAX);
set_bit(type, sfd_map);
return sfd;
}
int install_service_fd(enum sfd_type type, int fd)
{
int sfd = __get_service_fd(type, service_fd_id);