Signed-off-by: Lei Li <li...@linux.vnet.ibm.com>
---
qemu-char.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-config.c | 3 +
qemu-options.hx | 10 ++++
3 files changed, 144 insertions(+), 0 deletions(-)
diff --git a/qemu-char.c b/qemu-char.c
index 242b799..3e45ce6 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -99,6 +99,7 @@
#include "ui/qemu-spice.h"
#define READ_BUF_LEN 4096
+#define CBUFF_SIZE 65536
/***********************************************************/
/* character device */
@@ -2599,6 +2600,130 @@ size_t qemu_chr_mem_osize(const CharDriverState *chr)
return d->outbuf_size;
}
+/*********************************************************/
+/*CircularMemory chardev*/
+
+typedef struct {
+ size_t size;
+ size_t head;
+ size_t count;
+ uint8_t *cbuf;
+} CirMemCharDriver;
+
+static bool cirmem_chr_is_empty(const CharDriverState *chr)
+{
+ const CirMemCharDriver *d = chr->opaque;
+
+ return d->count == 0;
+}
+
+static bool cirmem_chr_is_full(const CharDriverState *chr)
+{
+ const CirMemCharDriver *d = chr->opaque;
+
+ return d->count == d->size;
+}
+
+static size_t qemu_chr_cirmem_count(const CharDriverState *chr)
+{
+ const CirMemCharDriver *d = chr->opaque;
+
+ return d->count;
+}
+
+static int cirmem_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
+{
+ CirMemCharDriver *d = chr->opaque;
+ int i;
+ int tail;
+
+ if (!buf || (len < 0)) {
+ return -1;
+ }
+
+ for (i = 0; i < len; i++ ) {
+ /* Avoid writing the IAC information to the queue. */
+ if ((unsigned char)buf[i] == IAC) {
+ continue;
+ }
+
+ tail = (d->head + d->count) % d->size;
+ d->cbuf[tail] = buf[i];
+ if (d->count == d->size) {
+ d->head = (d->head + 1) % d->size;
+ } else {
+ ++d->count;
+ }
+ }
+
+ return 0;
+}
+
+static int cirmem_chr_read(CharDriverState *chr, uint8_t *buf, int len)
+{
+ CirMemCharDriver *d = chr->opaque;
+ int i;
+
+ if (cirmem_chr_is_empty(chr) || len < 0) {
+ return -1;
+ }
+
+ for (i = 0; i < len; i++) {
+ buf[i] = d->cbuf[d->head];
+ d->head = (d->head + 1) % d->size;
+ d->count--;
+
+ if (cirmem_chr_is_empty(chr)) {
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void cirmem_chr_close(struct CharDriverState *chr)
+{
+ CirMemCharDriver *d = chr->opaque;
+
+ g_free(d->cbuf);
+ g_free(d);
+ chr->opaque = NULL;
+}
+
+static CharDriverState *qemu_chr_open_cirmemchr(QemuOpts *opts)
+{
+ CharDriverState *chr;
+ CirMemCharDriver *d;
+
+ chr = g_malloc0(sizeof(CharDriverState));
+ d = g_malloc(sizeof(*d));
+
+ d->size = qemu_opt_get_number(opts, "maxcapacity", 0);
+ if (d->size == 0) {
+ d->size = CBUFF_SIZE;
+ }
+
+ /* The size must be power of 2 */
+ if (d->size & (d->size - 1)) {
+ goto fail;
+ }
+
+ d->head = 0;
+ d->count = 0;
+ d->cbuf = g_malloc0(d->size);
+
+ chr->opaque = d;
+ chr->chr_write = cirmem_chr_write;
+ chr->chr_close = cirmem_chr_close;
+
+ return chr;
+
+fail:
+ g_free(d);
+ g_free(chr);
+ return NULL;
+}
+
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
{
char host[65], port[33], width[8], height[8];
@@ -2663,6 +2788,11 @@ QemuOpts *qemu_chr_parse_compat(const char *label, const
char *filename)
qemu_opt_set(opts, "path", p);
return opts;
}
+ if (strstart(filename, "memory", &p)) {
+ qemu_opt_set(opts, "backend", "memory");
+ qemu_opt_set(opts, "maxcapacity", p);
+ return opts;
+ }
if (strstart(filename, "tcp:", &p) ||
strstart(filename, "telnet:", &p)) {
if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) {
@@ -2736,6 +2866,7 @@ static const struct {
{ .name = "udp", .open = qemu_chr_open_udp },
{ .name = "msmouse", .open = qemu_chr_open_msmouse },
{ .name = "vc", .open = text_console_init },
+ { .name = "memory", .open = qemu_chr_open_cirmemchr },
#ifdef _WIN32
{ .name = "file", .open = qemu_chr_open_win_file_out },
{ .name = "pipe", .open = qemu_chr_open_win_pipe },
diff --git a/qemu-config.c b/qemu-config.c
index 10d1ba4..ddc2a2a 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -217,6 +217,9 @@ static QemuOptsList qemu_chardev_opts = {
},{
.name = "debug",
.type = QEMU_OPT_NUMBER,
+ },{
+ .name = "maxcapacity",
+ .type = QEMU_OPT_NUMBER,
},
{ /* end of list */ }
},
diff --git a/qemu-options.hx b/qemu-options.hx
index de43b1b..fb1bae4 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1728,6 +1728,7 @@ DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
"-chardev msmouse,id=id[,mux=on|off]\n"
"-chardev
vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n"
" [,mux=on|off]\n"
+ "-chardev memory,id=id,maxcapacity=maxcapacity\n"
"-chardev file,id=id,path=path[,mux=on|off]\n"
"-chardev pipe,id=id,path=path[,mux=on|off]\n"
#ifdef _WIN32
@@ -1766,6 +1767,7 @@ Backend is one of:
@option{udp},
@option{msmouse},
@option{vc},
+@option{memory},
@option{file},
@option{pipe},
@option{console},
@@ -1872,6 +1874,14 @@ the console, in pixels.
@option{cols} and @option{rows} specify that the console be sized to fit a text
console with the given dimensions.
+@item -chardev memory ,id=@var{id} ,maxcapacity=@var{maxcapacity}
+
+Create a circular buffer with fixed size indicated by optionally
@option{maxcapacity}
+which will be default 64K if it is not given.
+
+@option{maxcapacity} specifies the max capacity of the size of circular buffer
+to create. Should be power of 2.
+
@item -chardev file ,id=@var{id} ,path=@var{path}
Log all traffic received from the guest to a file.
--
1.7.7.6
