From 8d12cabf09996eef9adcc121ea3cbec70d48b3b4 Mon Sep 17 00:00:00 2001
From: Ian Molton <ian.molton@collabora.co.uk>
Date: Tue, 1 Dec 2009 11:18:41 +0000
Subject: [PATCH 2/4] socket: Add a reconnect option.
Add a reconnect option that allows sockets to reconnect (after a
specified delay) to the specified server. This makes the virtio-rng driver
useful in production environments where the EGD server may need to be restarted.
Signed-off-by: Ian Molton <ian.molton@collabora.co.uk>
---
qemu-char.c | 159 +++++++++++++++++++++++++++++++++++++++++++--------------
qemu-char.h | 2 +
qemu-config.c | 3 +
vl.c | 4 ++
4 files changed, 129 insertions(+), 39 deletions(-)
@@ -1870,8 +1870,12 @@ typedef struct {
int max_size;
int do_telnetopt;
int do_nodelay;
+ int reconnect;
int is_unix;
int msgfd;
+ QemuOpts *opts;
+ CharDriverState *chr;
+ int (*setup)(QemuOpts *opts);
} TCPCharDriver;
static void tcp_chr_accept(void *opaque);
@@ -2011,6 +2015,8 @@ static ssize_t tcp_chr_recv(CharDriverState *chr, char *buf, size_t len)
}
#endif
+static void qemu_chr_sched_reconnect(TCPCharDriver *s);
+
static void tcp_chr_read(void *opaque)
{
CharDriverState *chr = opaque;
@@ -2030,10 +2036,16 @@ static void tcp_chr_read(void *opaque)
if (s->listen_fd >= 0) {
qemu_set_fd_handler(s->listen_fd, tcp_chr_accept, NULL, chr);
}
- qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
+ if (!s->reconnect) {
+ qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
+ }
closesocket(s->fd);
s->fd = -1;
- qemu_chr_event(chr, CHR_EVENT_CLOSED);
+ if (s->reconnect) {
+ qemu_chr_sched_reconnect(s);
+ } else {
+ qemu_chr_event(chr, CHR_EVENT_CLOSED);
+ }
} else if (size > 0) {
if (s->do_telnetopt)
tcp_chr_process_IAC_bytes(chr, s, buf, &size);
@@ -2133,11 +2145,92 @@ static void tcp_chr_close(CharDriverState *chr)
qemu_chr_event(chr, CHR_EVENT_CLOSED);
}
+static int qemu_chr_connect_socket(TCPCharDriver *s)
+{
+ QemuOpts *opts = s->opts;
+ int is_listen;
+ int fd;
+ int is_waitconnect;
+ int do_nodelay;
+
+ is_waitconnect = qemu_opt_get_bool(opts, "wait", 1);
+ is_listen = qemu_opt_get_bool(opts, "server", 0);
+ do_nodelay = !qemu_opt_get_bool(opts, "delay", 1);
+
+
+ fd = s->setup(s->opts);
+ if (fd < 0)
+ return 0;
+
+ if (!is_waitconnect)
+ socket_set_nonblock(fd);
+
+ if (is_listen) {
+ s->listen_fd = fd;
+ qemu_set_fd_handler(s->listen_fd, tcp_chr_accept, NULL, s->chr);
+ if (is_waitconnect) {
+ printf("QEMU waiting for connection on: %s\n",
+ s->chr->filename);
+ tcp_chr_accept(s->chr);
+ socket_set_nonblock(s->listen_fd);
+ }
+ } else {
+ s->fd = fd;
+ socket_set_nodelay(fd);
+ tcp_chr_connect(s->chr);
+ }
+
+ return 1;
+}
+
+static QLIST_HEAD(reconnect_list_head, reconnect_list_entry) rcl_head;
+
+typedef struct reconnect_list_entry {
+ TCPCharDriver *s;
+ uint64_t when;
+ QLIST_ENTRY(reconnect_list_entry) entries;
+} reconnect_list_entry;
+
+static void qemu_chr_sched_reconnect(TCPCharDriver *s)
+{
+ reconnect_list_entry *new = qemu_malloc(sizeof(*new));
+ struct timeval tv;
+
+ qemu_gettimeofday(&tv);
+ new->s = s;
+ new->when = (s->reconnect + tv.tv_sec) * 1000000 + tv.tv_usec;
+ QLIST_INSERT_HEAD(&rcl_head, new, entries);
+}
+
+void qemu_chr_reconnect(void)
+{
+ struct timeval tv;
+ uint64_t now;
+ reconnect_list_entry *np;
+
+ if (!rcl_head.lh_first)
+ return;
+
+ gettimeofday(&tv, NULL);
+ now = tv.tv_sec * 1000000 + tv.tv_usec;
+
+ for (np = rcl_head.lh_first; np != NULL; np = np->entries.le_next) {
+ if (np->when <= now) {
+ if (qemu_chr_connect_socket(np->s)) {
+ qemu_chr_event(np->s->chr, CHR_EVENT_RECONNECTED);
+ QLIST_REMOVE(np, entries);
+ }
+ else {
+ np->when += np->s->reconnect * 1000000;
+ }
+ }
+ }
+}
+
static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
{
CharDriverState *chr = NULL;
TCPCharDriver *s = NULL;
- int fd = -1;
int is_listen;
int is_waitconnect;
int do_nodelay;
@@ -2145,34 +2238,40 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
int is_telnet;
is_listen = qemu_opt_get_bool(opts, "server", 0);
+ is_unix = qemu_opt_get(opts, "path") != NULL;
+
is_waitconnect = qemu_opt_get_bool(opts, "wait", 1);
is_telnet = qemu_opt_get_bool(opts, "telnet", 0);
do_nodelay = !qemu_opt_get_bool(opts, "delay", 1);
- is_unix = qemu_opt_get(opts, "path") != NULL;
- if (!is_listen)
+
+ if (!is_listen) {
is_waitconnect = 0;
+ } else {
+ if (is_telnet)
+ s->do_telnetopt = 1;
+ }
+
- chr = qemu_mallocz(sizeof(CharDriverState));
s = qemu_mallocz(sizeof(TCPCharDriver));
+ chr = qemu_mallocz(sizeof(CharDriverState));
+ s->opts = opts;
+
+ if (!is_listen && !is_telnet)
+ s->reconnect = qemu_opt_get_number(opts, "reconnect", 0);
if (is_unix) {
if (is_listen) {
- fd = unix_listen_opts(opts);
+ s->setup = unix_listen_opts;
} else {
- fd = unix_connect_opts(opts);
+ s->setup = unix_connect_opts;
}
} else {
if (is_listen) {
- fd = inet_listen_opts(opts, 0);
+ s->setup = inet_listen_opts;
} else {
- fd = inet_connect_opts(opts);
+ s->setup = inet_connect_opts;
}
}
- if (fd < 0)
- goto fail;
-
- if (!is_waitconnect)
- socket_set_nonblock(fd);
s->connected = 0;
s->fd = -1;
@@ -2186,19 +2285,6 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
chr->chr_close = tcp_chr_close;
chr->get_msgfd = tcp_get_msgfd;
- if (is_listen) {
- s->listen_fd = fd;
- qemu_set_fd_handler(s->listen_fd, tcp_chr_accept, NULL, chr);
- if (is_telnet)
- s->do_telnetopt = 1;
-
- } else {
- s->connected = 1;
- s->fd = fd;
- socket_set_nodelay(fd);
- tcp_chr_connect(chr);
- }
-
/* for "info chardev" monitor command */
chr->filename = qemu_malloc(256);
if (is_unix) {
@@ -2215,19 +2301,14 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
qemu_opt_get_bool(opts, "server", 0) ? ",server" : "");
}
- if (is_listen && is_waitconnect) {
- printf("QEMU waiting for connection on: %s\n",
- chr->filename);
- tcp_chr_accept(chr);
- socket_set_nonblock(s->listen_fd);
- }
- return chr;
+ s->chr = chr;
+
+ if(qemu_chr_connect_socket(s))
+ return chr;
- fail:
- if (fd >= 0)
- closesocket(fd);
- qemu_free(s);
qemu_free(chr);
+ qemu_free(s);
+
return NULL;
}
@@ -14,6 +14,7 @@
#define CHR_EVENT_MUX_IN 3 /* mux-focus was set to this terminal */
#define CHR_EVENT_MUX_OUT 4 /* mux-focus will move on */
#define CHR_EVENT_CLOSED 5 /* connection closed */
+#define CHR_EVENT_RECONNECTED 6 /* reconnect event */
#define CHR_IOCTL_SERIAL_SET_PARAMS 1
@@ -73,6 +74,7 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts,
void (*init)(struct CharDriverState *s));
CharDriverState *qemu_chr_open(const char *label, const char *filename, void (*init)(struct CharDriverState *s));
void qemu_chr_close(CharDriverState *chr);
+void qemu_chr_reconnect(void);
void qemu_chr_printf(CharDriverState *s, const char *fmt, ...);
int qemu_chr_write(CharDriverState *s, const uint8_t *buf, int len);
void qemu_chr_send_event(CharDriverState *s, int event);
@@ -140,6 +140,9 @@ QemuOptsList qemu_chardev_opts = {
},{
.name = "signal",
.type = QEMU_OPT_BOOL,
+ },{
+ .name = "reconnect",
+ .type = QEMU_OPT_NUMBER,
},
{ /* end if list */ }
},
@@ -3795,6 +3795,10 @@ void main_loop_wait(int timeout)
host_main_loop_wait(&timeout);
+ /* Reconnect any disconnected sockets, if necessary */
+
+ qemu_chr_reconnect();
+
/* poll any events */
/* XXX: separate device handlers from system ones */
nfds = -1;
--
1.6.5