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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v5 2/2] xl: Add escape character argument to xl console
From: Peter Hoyes <Peter.Hoyes@xxxxxxx>
Add -e argument to xl console and pass to new escape_character argument
of libxl_console_exec.
Introduce a new API version to support this new argument and advertise
the new functionality in libxl.h
In libxl_console_exec, there are currently two call sites to execl,
which uses varargs, in order to support optionally passing
'start-notify-fd' to the console client. In order to support passing
the 'escape' argument optionally too, refactor to instead have a single
call site to execv, which has the same behavior but takes an array of
arguments.
If -e is not specified, --escape is not passed to the console client and
the existing value (^]) is used as a default.
Update the xl docs.
Signed-off-by: Peter Hoyes <Peter.Hoyes@xxxxxxx>
---
Changes in v5:
- Add this changelog
- Fix comment style in libxl_console_exec
Changes in v4:
- Document xl console -e argument in xl.1.pod.in
- Add changes for libxl API version compatibility
Changes in v3:
- Re-add the Reviewed-By tag accidentally removed in v2
Changes in v2:
- Drop the tags intended only for internal use at Arm
docs/man/xl.1.pod.in | 8 ++++++-
tools/include/libxl.h | 39 +++++++++++++++++++++++++++++---
tools/libs/light/libxl_console.c | 30 +++++++++++++++++-------
tools/xl/xl_cmdtable.c | 3 ++-
tools/xl/xl_console.c | 10 +++++---
tools/xl/xl_vmcontrol.c | 2 +-
6 files changed, 75 insertions(+), 17 deletions(-)
diff --git a/docs/man/xl.1.pod.in b/docs/man/xl.1.pod.in
index 101e14241d..9ba22a8fa2 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -222,7 +222,8 @@ Attach to the console of a domain specified by
I<domain-id>. If you've set up
your domains to have a traditional login console this will look much like a
normal text login screen.
-Use the key combination Ctrl+] to detach from the domain console.
+Use the escape character key combination (default Ctrl+]) to detach from the
+domain console.
B<OPTIONS>
@@ -239,6 +240,11 @@ emulated serial for HVM guests and PV console for PV
guests.
Connect to console number I<NUM>. Console numbers start from 0.
+=item I<-e escapechar>
+
+Customize the escape sequence used to detach from the domain console to
+I<escapechar>. If not specified, the value "^]" is used.
+
=back
=item B<destroy> [I<OPTIONS>] I<domain-id>
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index cac641a7eb..21e43cc839 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -81,6 +81,15 @@
*/
#define LIBXL_HAVE_CONSOLE_NOTIFY_FD 1
+/* LIBXL_HAVE_CONSOLE_ESCAPE_CHARACTER
+ *
+ * If this is defined, libxl_console_exec and
+ * libxl_primary_console_exe take an escape_character parameter. That
+ * parameter will be used to modify the escape sequence used to exit the
+ * console.
+ */
+#define LIBXL_HAVE_CONSOLE_ESCAPE_CHARACTER 1
+
/* LIBXL_HAVE_CONST_COPY_AND_LENGTH_FUNCTIONS
*
* If this is defined, the copy functions have constified src parameter and the
@@ -790,7 +799,8 @@ typedef struct libxl__ctx libxl_ctx;
#if LIBXL_API_VERSION != 0x040200 && LIBXL_API_VERSION != 0x040300 && \
LIBXL_API_VERSION != 0x040400 && LIBXL_API_VERSION != 0x040500 && \
LIBXL_API_VERSION != 0x040700 && LIBXL_API_VERSION != 0x040800 && \
- LIBXL_API_VERSION != 0x041300 && LIBXL_API_VERSION != 0x041400
+ LIBXL_API_VERSION != 0x041300 && LIBXL_API_VERSION != 0x041400 && \
+ LIBXL_API_VERSION != 0x041800
#error Unknown LIBXL_API_VERSION
#endif
#endif
@@ -1958,7 +1968,8 @@ int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid,
int autopass);
* the caller that it has connected to the guest console.
*/
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
- libxl_console_type type, int notify_fd);
+ libxl_console_type type, int notify_fd,
+ char* escape_character);
/* libxl_primary_console_exec finds the domid and console number
* corresponding to the primary console of the given vm, then calls
* libxl_console_exec with the right arguments (domid might be different
@@ -1968,9 +1979,12 @@ int libxl_console_exec(libxl_ctx *ctx, uint32_t domid,
int cons_num,
* guests using pygrub.
* If notify_fd is not -1, xenconsole will write 0x00 to it to nofity
* the caller that it has connected to the guest console.
+ * If escape_character is not NULL, the provided value is used to exit
+ * the guest console.
*/
int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm,
- int notify_fd);
+ int notify_fd,
+ char* escape_character);
#if defined(LIBXL_API_VERSION) && LIBXL_API_VERSION < 0x040800
@@ -1989,6 +2003,25 @@ static inline int
libxl_primary_console_exec_0x040700(libxl_ctx *ctx,
}
#define libxl_primary_console_exec libxl_primary_console_exec_0x040700
+#elif defined(LIBXL_API_VERSION) && LIBXL_API_VERSION < 0x041800
+
+static inline int libxl_console_exec_0x041800(libxl_ctx *ctx, uint32_t domid,
+ int cons_num,
+ libxl_console_type type,
+ int notify_fd)
+{
+ return libxl_console_exec(ctx, domid, cons_num, type, notify_fd, NULL);
+}
+#define libxl_console_exec libxl_console_exec_0x041800
+
+static inline int libxl_primary_console_exec_0x041800(libxl_ctx *ctx,
+ uint32_t domid_vm,
+ int notify_fd)
+{
+ return libxl_primary_console_exec(ctx, domid_vm, notify_fd, NULL);
+}
+#define libxl_primary_console_exec libxl_primary_console_exec_0x041800
+
#endif
/* libxl_console_get_tty retrieves the specified domain's console tty path
diff --git a/tools/libs/light/libxl_console.c b/tools/libs/light/libxl_console.c
index f497be141b..cd7412a327 100644
--- a/tools/libs/light/libxl_console.c
+++ b/tools/libs/light/libxl_console.c
@@ -52,7 +52,8 @@ out:
}
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
- libxl_console_type type, int notify_fd)
+ libxl_console_type type, int notify_fd,
+ char* escape_character)
{
GC_INIT(ctx);
char *p = GCSPRINTF("%s/xenconsole", libxl__private_bindir_path());
@@ -75,15 +76,26 @@ int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int
cons_num,
goto out;
}
+ char *args[] = {
+ p, domid_s, "--num", cons_num_s, "--type", cons_type_s,
+ NULL, NULL, NULL, NULL, /* start-notify-fd, escape */
+ NULL, /* list terminator - do not use */
+ };
+ char **args_extra = args + 6;
+
if (notify_fd != -1) {
notify_fd_s = GCSPRINTF("%d", notify_fd);
- execl(p, p, domid_s, "--num", cons_num_s, "--type", cons_type_s,
- "--start-notify-fd", notify_fd_s, (void *)NULL);
- } else {
- execl(p, p, domid_s, "--num", cons_num_s, "--type", cons_type_s,
- (void *)NULL);
+ *args_extra++ = "--start-notify-fd";
+ *args_extra++ = notify_fd_s;
}
+ if (escape_character) {
+ *args_extra++ = "--escape";
+ *args_extra++ = escape_character;
+ }
+
+ execv(p, args);
+
out:
GC_FREE;
return ERROR_FAIL;
@@ -156,7 +168,8 @@ out:
return rc;
}
-int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm, int
notify_fd)
+int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm, int
notify_fd,
+ char* escape_character)
{
uint32_t domid;
int cons_num;
@@ -165,7 +178,8 @@ int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t
domid_vm, int notify_fd)
rc = libxl__primary_console_find(ctx, domid_vm, &domid, &cons_num, &type);
if ( rc ) return rc;
- return libxl_console_exec(ctx, domid, cons_num, type, notify_fd);
+ return libxl_console_exec(ctx, domid, cons_num, type, notify_fd,
+ escape_character);
}
int libxl_primary_console_get_tty(libxl_ctx *ctx, uint32_t domid_vm,
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index ccf4d83584..67604e9536 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -141,7 +141,8 @@ const struct cmd_spec cmd_table[] = {
"Attach to domain's console",
"[options] <Domain>\n"
"-t <type> console type, pv , serial or vuart\n"
- "-n <number> console number"
+ "-n <number> console number\n"
+ "-e <escape> escape character"
},
{ "vncviewer",
&main_vncviewer, 0, 0,
diff --git a/tools/xl/xl_console.c b/tools/xl/xl_console.c
index b27f9e0136..5633c6f6f7 100644
--- a/tools/xl/xl_console.c
+++ b/tools/xl/xl_console.c
@@ -28,8 +28,9 @@ int main_console(int argc, char **argv)
int opt = 0, num = 0;
libxl_console_type type = 0;
const char *console_names = "pv, serial, vuart";
+ char* escape_character = NULL;
- SWITCH_FOREACH_OPT(opt, "n:t:", NULL, "console", 1) {
+ SWITCH_FOREACH_OPT(opt, "n:t:e:", NULL, "console", 1) {
case 't':
if (!strcmp(optarg, "pv"))
type = LIBXL_CONSOLE_TYPE_PV;
@@ -45,13 +46,16 @@ int main_console(int argc, char **argv)
case 'n':
num = atoi(optarg);
break;
+ case 'e':
+ escape_character = optarg;
+ break;
}
domid = find_domain(argv[optind]);
if (!type)
- libxl_primary_console_exec(ctx, domid, -1);
+ libxl_primary_console_exec(ctx, domid, -1, escape_character);
else
- libxl_console_exec(ctx, domid, num, type, -1);
+ libxl_console_exec(ctx, domid, num, type, -1, escape_character);
fprintf(stderr, "Unable to attach console\n");
return EXIT_FAILURE;
}
diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index 5518c78dc6..03971927e9 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -643,7 +643,7 @@ static void autoconnect_console(libxl_ctx *ctx_ignored,
postfork();
sleep(1);
- libxl_primary_console_exec(ctx, bldomid, notify_fd);
+ libxl_primary_console_exec(ctx, bldomid, notify_fd, NULL);
/* Do not return. xl continued in child process */
perror("xl: unable to exec console client");
_exit(1);
--
2.34.1
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