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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] Extending XL console command to take -e option that allows user to change escape character. Previously, Escape character was hardcoded as 0x1d i.e '^]'. Now, User has can provide escape character of his/her choice. It can be specified as any char starting with ^. For example, xl console -e ^a testDomain
---
tools/console/client/main.c | 26 ++++++++++++++++++++++++--
tools/libxl/libxl.c | 15 ++++++++++-----
tools/libxl/libxl.h | 23 ++++++++++++++++++++---
tools/libxl/xl_cmdimpl.c | 30 ++++++++++++++++++++++++------
tools/libxl/xl_cmdtable.c | 5 +++--
5 files changed, 81 insertions(+), 18 deletions(-)
diff --git a/tools/console/client/main.c b/tools/console/client/main.c
index d006fdc..e175bbe 100644
--- a/tools/console/client/main.c
+++ b/tools/console/client/main.c
@@ -35,6 +35,7 @@
#include <sys/select.h>
#include <err.h>
#include <string.h>
+#include <ctype.h>
#ifdef __sun__
#include <sys/stropts.h>
#endif
@@ -45,10 +46,12 @@
#define ESCAPE_CHARACTER 0x1d
+
+
static volatile sig_atomic_t received_signal = 0;
static char lockfile[sizeof (XEN_LOCK_DIR "/xenconsole.") + 8] = { 0 };
static int lockfd = -1;
-
+static char escapechar = ESCAPE_CHARACTER;
static void sighandler(int signum)
{
received_signal = 1;
@@ -214,7 +217,7 @@ static int console_loop(int fd, struct xs_handle *xs, char
*pty_path,
char msg[60];
len = read(STDIN_FILENO, msg, sizeof(msg));
- if (len == 1 && msg[0] == ESCAPE_CHARACTER) {
+ if (len == 1 && msg[0] == escapechar) {
return 0;
}
@@ -318,6 +321,19 @@ static void console_unlock(void)
}
}
+
+char getControlChar(char c) {
+ return (c ^ 0x40);
+}
+
+char getEscapeChar(const char *s)
+{
+ if (*s == '^')
+ return getControlChar(s[1]);
+
+ return *s;
+}
+
int main(int argc, char **argv)
{
struct termios attr;
@@ -329,6 +345,7 @@ int main(int argc, char **argv)
struct option lopt[] = {
{ "type", 1, 0, 't' },
{ "num", 1, 0, 'n' },
+ { "e", 1, 0, 'n' },
{ "help", 0, 0, 'h' },
{ 0 },
@@ -363,6 +380,11 @@ int main(int argc, char **argv)
exit(EINVAL);
}
break;
+ case 'e' :
+ escapechar = getEscapeChar(optarg);
+ break;
+
+
default:
fprintf(stderr, "Invalid argument\n");
fprintf(stderr, "Try `%s --help' for more
information.\n",
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 4cdc169..2b9ae22 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1715,14 +1715,16 @@ static void domain_destroy_domid_cb(libxl__egc *egc,
}
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
- libxl_console_type type)
+ libxl_console_type type, char escapechar)
{
+
+
GC_INIT(ctx);
char *p = GCSPRINTF("%s/xenconsole", libxl__private_bindir_path());
char *domid_s = GCSPRINTF("%d", domid);
char *cons_num_s = GCSPRINTF("%d", cons_num);
char *cons_type_s;
-
+ char *cons_escape_char = GCSPRINTF("%c", escapechar);
switch (type) {
case LIBXL_CONSOLE_TYPE_PV:
cons_type_s = "pv";
@@ -1734,7 +1736,10 @@ int libxl_console_exec(libxl_ctx *ctx, uint32_t domid,
int cons_num,
goto out;
}
- execl(p, p, domid_s, "--num", cons_num_s, "--type", cons_type_s, (void
*)NULL);
+ if(cons_escape_char == 0)
+ execl(p, p, domid_s, "--num", cons_num_s, "--type", cons_type_s,(void
*)NULL);
+ else
+ execl(p, p, domid_s, "--num", cons_num_s, "--type", cons_type_s,
"--e", cons_escape_char, (void *)NULL);
out:
GC_FREE;
@@ -1823,7 +1828,7 @@ out:
return rc;
}
-int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm)
+int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm, char
escapechar)
{
uint32_t domid;
int cons_num;
@@ -1832,7 +1837,7 @@ int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t
domid_vm)
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);
+ return libxl_console_exec(ctx, domid, cons_num, type, escapechar);
}
int libxl_primary_console_get_tty(libxl_ctx *ctx, uint32_t domid_vm,
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index f9e3ef5..4ac8cfd 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -218,6 +218,12 @@
#define LIBXL_HAVE_SOFT_RESET 1
/*
+ if user does not specify any escape character sequence then
+ Default escape character will be ^]
+ */
+
+#define CTRL_CLOSE_BRACKET '\e'
+/*
* libxl ABI compatibility
*
* The only guarantee which libxl makes regarding ABI compatibility
@@ -1317,15 +1323,26 @@ int libxl_wait_for_free_memory(libxl_ctx *ctx, uint32_t
domid, uint32_t memory_k
int libxl_wait_for_memory_target(libxl_ctx *ctx, uint32_t domid, int
wait_secs);
int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid, int autopass);
-int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
libxl_console_type type);
+
+
+/*
+ * Escapechar can be specified , If specified given escape char will
+ * be used for terminating logging. Otherwise default Ctrl-] will be used,
+ */
+int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
libxl_console_type type, char escapechar);
/* 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
* if the guest is using stubdoms).
* This function can be called after creating the device model, in
* case of HVM guests, and before libxl_run_bootloader in case of PV
- * guests using pygrub. */
-int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm);
+ * guests using pygrub.
+ *
+ * Escapechar can be specified , If specified given escape char will
+ * be used for terminating logging. Otherwise default Ctrl-] will be used,
+ */
+
+int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm, char
escapechar);
/* libxl_console_get_tty retrieves the specified domain's console tty path
* and stores it in path. Caller is responsible for freeing the memory.
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 990d3c9..da290b6 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1,3 +1,4 @@
+
/*
* Copyright (C) 2009 Citrix Ltd.
* Author Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
@@ -41,7 +42,9 @@
#include "libxl_json.h"
#include "libxlutil.h"
#include "xl.h"
-
+#define ESCAPE_CHARACTER 0x1d
+char getControlChar(char c);
+char getEscapeChar(const char *s);
/* For calls which return an errno on failure */
#define CHK_ERRNOVAL( call ) ({ \
int chk_errnoval = (call); \
@@ -2623,7 +2626,7 @@ static void autoconnect_console(libxl_ctx *ctx_ignored,
postfork();
sleep(1);
- libxl_primary_console_exec(ctx, bldomid);
+ libxl_primary_console_exec(ctx, bldomid, ESCAPE_CHARACTER);
/* Do not return. xl continued in child process */
perror("xl: unable to exec console client");
_exit(1);
@@ -3411,14 +3414,24 @@ int main_cd_insert(int argc, char **argv)
cd_insert(domid, virtdev, file);
return 0;
}
+char getControlChar(char c) {
+ return c ^ 0x40;
+}
+char getEscapeChar(const char *s)
+{
+ if (*s == '^')
+ return getControlChar(s[1]);
+ return *s;
+}
int main_console(int argc, char **argv)
{
uint32_t domid;
int opt = 0, num = 0;
+ char escapechar = ESCAPE_CHARACTER;
libxl_console_type type = 0;
- 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;
@@ -3432,13 +3445,18 @@ int main_console(int argc, char **argv)
case 'n':
num = atoi(optarg);
break;
+ case 'e':
+ escapechar = getEscapeChar(optarg);
+ break;
}
domid = find_domain(argv[optind]);
if (!type)
- libxl_primary_console_exec(ctx, domid);
- else
- libxl_console_exec(ctx, domid, num, type);
+ libxl_primary_console_exec(ctx, domid, escapechar);
+ else
+ libxl_console_exec(ctx, domid, num, type, escapechar);
+
+
fprintf(stderr, "Unable to attach console\n");
return 1;
}
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index fdc1ac6..794c7c1 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -133,8 +133,9 @@ struct cmd_spec cmd_table[] = {
&main_console, 0, 0,
"Attach to domain's console",
"[options] <Domain>\n"
- "-t <type> console type, pv or serial\n"
- "-n <number> console number"
+ "-t <type> console type, pv or serial\n"
+ "-n <number> console number\n"
+ "-e <escapechar> escape character"
},
{ "vncviewer",
&main_vncviewer, 0, 0,
--
1.9.1
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