[CRIU] [PATCH] tty: add vt support
Ruslan Kuprieiev
kupruser at gmail.com
Thu Dec 4 15:44:22 PST 2014
/dev/ttyN are the virtual terminals which are provided
by the system with major 4 and minor 0..63.
You can run some program on ttyN by pressing alt+ctrl+FN
and running it manualy or by using open(openvt nowadays).
Signed-off-by: Ruslan Kuprieiev <kupruser at gmail.com>
---
include/tty.h | 9 ++++++++
protobuf/tty.proto | 1 +
tty.c | 62 ++++++++++++++++++++++++++++++++++++++++++++----------
3 files changed, 61 insertions(+), 11 deletions(-)
diff --git a/include/tty.h b/include/tty.h
index a3026f6..5019dcf 100644
--- a/include/tty.h
+++ b/include/tty.h
@@ -13,6 +13,7 @@ enum {
TTY_TYPE_PTM = 1,
TTY_TYPE_PTS = 2,
TTY_TYPE_CONSOLE = 3,
+ TTY_TYPE_VT = 4,
TTY_TYPE_MAX
};
@@ -34,6 +35,14 @@ static inline int tty_type(int major, int minor)
else if (minor == 1)
return TTY_TYPE_CONSOLE;
break;
+ case TTY_MAJOR:
+ if (minor < 64)
+ /*
+ * Beyond 63 are the serial devices.
+ * Not sure how to handle them, so lets
+ * leave them till someone requests.
+ */
+ return TTY_TYPE_VT;
case UNIX98_PTY_MASTER_MAJOR ... (UNIX98_PTY_MASTER_MAJOR + UNIX98_PTY_MAJOR_COUNT - 1):
return TTY_TYPE_PTM;
case UNIX98_PTY_SLAVE_MAJOR:
diff --git a/protobuf/tty.proto b/protobuf/tty.proto
index 18470a9..0e67e85 100644
--- a/protobuf/tty.proto
+++ b/protobuf/tty.proto
@@ -27,6 +27,7 @@ enum TtyType {
UNKNOWN = 0;
PTY = 1;
CONSOLE = 2;
+ VT = 3;
}
message tty_info_entry {
diff --git a/tty.c b/tty.c
index b076f06..5886dff 100644
--- a/tty.c
+++ b/tty.c
@@ -118,6 +118,7 @@ static LIST_HEAD(all_ttys);
#define MAX_TTYS 1024
#define MAX_PTY_INDEX 1000
#define CONSOLE_INDEX 1002
+#define VT_INDEX 1004
static DECLARE_BITMAP(tty_bitmap, (MAX_TTYS << 1));
static DECLARE_BITMAP(tty_active_pairs, (MAX_TTYS << 1));
@@ -235,11 +236,17 @@ static int parse_tty_index(u32 id, int lfd, const struct fd_parms *p, int type)
case TTY_TYPE_CONSOLE:
index = CONSOLE_INDEX;
break;
+
+ case TTY_TYPE_VT: {
+ index = VT_INDEX;
+ break;
+ }
default:
BUG();
}
if (type != TTY_TYPE_CONSOLE &&
+ type != TTY_TYPE_VT &&
index > MAX_PTY_INDEX) {
pr_err("Index %d on tty %x is too big\n", index, id);
return -1;
@@ -508,6 +515,13 @@ static int tty_restore_ctl_terminal(struct file_desc *d, int fd)
pr_perror("Can't open %s", path_from_reg(info->reg_d));
goto err;
}
+ } else if (info->type == TTY_TYPE_VT) {
+ slave = open_pty_reg(info->reg_d, O_RDONLY);
+ index = VT_INDEX;
+ if (slave < 0) {
+ pr_perror("Can't open %s", path_from_reg(info->reg_d));
+ goto err;
+ }
} else
BUG();
@@ -534,13 +548,21 @@ static char *tty_name(int type)
return "pts";
case TTY_TYPE_CONSOLE:
return "console";
+ case TTY_TYPE_VT:
+ return "tty";
}
return "unknown";
}
static bool tty_is_master(struct tty_info *info)
{
- return info->type == TTY_TYPE_PTM || info->type == TTY_TYPE_CONSOLE;
+ if (info->type == TTY_TYPE_PTM || info->type == TTY_TYPE_CONSOLE)
+ return true;
+
+ if (info->type == TTY_TYPE_VT && !opts.shell_job)
+ return true;
+
+ return false;
}
static bool tty_is_hung(struct tty_info *info)
@@ -558,9 +580,21 @@ static bool tty_has_active_pair(struct tty_info *info)
static void tty_show_pty_info(char *prefix, struct tty_info *info)
{
+ int index;
+
+ switch (info->type) {
+ case TTY_TYPE_CONSOLE:
+ index = CONSOLE_INDEX;
+ break;
+ case TTY_TYPE_VT:
+ index = VT_INDEX;
+ break;
+ default:
+ index = info->tie->pty->index;
+ }
+
pr_info("%s type %s id %#x index %d (master %d sid %d pgrp %d inherit %d)\n",
- prefix, tty_name(info->type), info->tfe->id,
- info->type == TTY_TYPE_CONSOLE ? CONSOLE_INDEX : info->tie->pty->index,
+ prefix, tty_name(info->type), info->tfe->id, index,
tty_is_master(info), info->tie->sid, info->tie->pgrp, info->inherit);
}
@@ -788,14 +822,15 @@ err:
return -1;
}
-static int open_console(struct tty_info *info)
+static int open_simple_tty(struct tty_info *info)
{
int fd = -1;
fd = open_pty_reg(info->reg_d, info->tfe->flags);
if (fd < 0) {
- pr_perror("Can't open console %x",
- info->tfe->id);
+ pr_perror("Can't open %s %x",
+ info->type == TTY_TYPE_CONSOLE ? "console" : "virtual terminal",
+ info->tfe->id);
return -1;
}
@@ -820,8 +855,8 @@ static int tty_open(struct file_desc *d)
if (!tty_is_master(info))
return pty_open_unpaired_slave(d, info);
- if (info->type == TTY_TYPE_CONSOLE)
- return open_console(info);
+ if (info->type == TTY_TYPE_CONSOLE || info->type == TTY_TYPE_VT)
+ return open_simple_tty(info);
return pty_open_ptmx(info);
}
@@ -1002,12 +1037,12 @@ int tty_setup_slavery(void)
list_for_each_entry(info, &all_ttys, list) {
if (tty_find_restoring_task(info))
return -1;
- if (info->type == TTY_TYPE_CONSOLE)
+ if (info->type == TTY_TYPE_CONSOLE || info->type == TTY_TYPE_VT)
continue;
peer = info;
list_for_each_entry_safe_continue(peer, m, &all_ttys, list) {
- if (peer->type == TTY_TYPE_CONSOLE)
+ if (peer->type == TTY_TYPE_CONSOLE || info->type == TTY_TYPE_VT)
continue;
if (peer->tie->pty->index != info->tie->pty->index)
continue;
@@ -1057,7 +1092,8 @@ static int verify_info(struct tty_info *info)
{
if (info->type != TTY_TYPE_PTM &&
info->type != TTY_TYPE_PTS &&
- info->type != TTY_TYPE_CONSOLE) {
+ info->type != TTY_TYPE_CONSOLE &&
+ info->type != TTY_TYPE_VT) {
pr_err("Unknown type %d master peer %x\n",
info->type, info->tfe->id);
return -1;
@@ -1115,6 +1151,7 @@ static int collect_one_tty_info_entry(void *obj, ProtobufCMessage *msg)
}
break;
case TTY_TYPE__CONSOLE:
+ case TTY_TYPE__VT:
if (info->tie->pty) {
pr_err("PTY data found (id %x), corrupted image?\n",
info->tie->id);
@@ -1312,6 +1349,9 @@ static int dump_tty_info(int lfd, u32 id, const struct fd_parms *p, int type, in
case TTY_TYPE_CONSOLE:
info.type = TTY_TYPE__CONSOLE;
break;
+ case TTY_TYPE_VT:
+ info.type = TTY_TYPE__VT;
+ break;
default:
BUG();
}
--
1.9.3
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