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-rw-r--r--migration-tcp.c37
-rw-r--r--qemu-char.c2
-rw-r--r--qemu-sockets.c129
-rw-r--r--qemu_socket.h16
4 files changed, 126 insertions, 58 deletions
diff --git a/migration-tcp.c b/migration-tcp.c
index 7f6ad98727..a15c2b87a1 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -53,54 +53,35 @@ static int tcp_close(MigrationState *s)
return r;
}
-static void tcp_wait_for_connect(void *opaque)
+static void tcp_wait_for_connect(int fd, void *opaque)
{
MigrationState *s = opaque;
- int val, ret;
- socklen_t valsize = sizeof(val);
- DPRINTF("connect completed\n");
- do {
- ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
- } while (ret == -1 && (socket_error()) == EINTR);
-
- if (ret < 0) {
+ if (fd < 0) {
+ DPRINTF("migrate connect error\n");
+ s->fd = -1;
migrate_fd_error(s);
- return;
- }
-
- qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
-
- if (val == 0)
+ } else {
+ DPRINTF("migrate connect success\n");
+ s->fd = fd;
migrate_fd_connect(s);
- else {
- DPRINTF("error connecting %d\n", val);
- migrate_fd_error(s);
}
}
int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
Error **errp)
{
- bool in_progress;
-
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
- s->fd = inet_nonblocking_connect(host_port, &in_progress, errp);
+ s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s,
+ errp);
if (error_is_set(errp)) {
migrate_fd_error(s);
return -1;
}
- if (in_progress) {
- DPRINTF("connect in progress\n");
- qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
- } else {
- migrate_fd_connect(s);
- }
-
return 0;
}
diff --git a/qemu-char.c b/qemu-char.c
index 13b87b53c1..b082bae11b 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2456,7 +2456,7 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
if (is_listen) {
fd = inet_listen_opts(opts, 0, NULL);
} else {
- fd = inet_connect_opts(opts, true, NULL, NULL);
+ fd = inet_connect_opts(opts, NULL, NULL, NULL);
}
}
if (fd < 0) {
diff --git a/qemu-sockets.c b/qemu-sockets.c
index 0883a66eb2..1f14e8bc63 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -24,6 +24,7 @@
#include "qemu_socket.h"
#include "qemu-common.h" /* for qemu_isdigit */
+#include "main-loop.h"
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
@@ -214,14 +215,66 @@ listen:
((rc) == -EINPROGRESS)
#endif
-static int inet_connect_addr(struct addrinfo *addr, bool block,
- bool *in_progress)
+/* Struct to store connect state for non blocking connect */
+typedef struct ConnectState {
+ int fd;
+ struct addrinfo *addr_list;
+ struct addrinfo *current_addr;
+ NonBlockingConnectHandler *callback;
+ void *opaque;
+} ConnectState;
+
+static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
+ ConnectState *connect_state);
+
+static void wait_for_connect(void *opaque)
{
- int sock, rc;
+ ConnectState *s = opaque;
+ int val = 0, rc = 0;
+ socklen_t valsize = sizeof(val);
+ bool in_progress;
+
+ qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+
+ do {
+ rc = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
+ } while (rc == -1 && socket_error() == EINTR);
+
+ /* update rc to contain error */
+ if (!rc && val) {
+ rc = -1;
+ }
+
+ /* connect error */
+ if (rc < 0) {
+ closesocket(s->fd);
+ s->fd = rc;
+ }
+
+ /* try to connect to the next address on the list */
+ while (s->current_addr->ai_next != NULL && s->fd < 0) {
+ s->current_addr = s->current_addr->ai_next;
+ s->fd = inet_connect_addr(s->current_addr, &in_progress, s);
+ /* connect in progress */
+ if (in_progress) {
+ return;
+ }
+ }
- if (in_progress) {
- *in_progress = false;
+ freeaddrinfo(s->addr_list);
+ if (s->callback) {
+ s->callback(s->fd, s->opaque);
}
+ g_free(s);
+ return;
+}
+
+static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
+ ConnectState *connect_state)
+{
+ int sock, rc;
+
+ *in_progress = false;
sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
if (sock < 0) {
@@ -230,7 +283,7 @@ static int inet_connect_addr(struct addrinfo *addr, bool block,
return -1;
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
- if (!block) {
+ if (connect_state != NULL) {
socket_set_nonblock(sock);
}
/* connect to peer */
@@ -241,10 +294,11 @@ static int inet_connect_addr(struct addrinfo *addr, bool block,
}
} while (rc == -EINTR);
- if (!block && QEMU_SOCKET_RC_INPROGRESS(rc)) {
- if (in_progress) {
- *in_progress = true;
- }
+ if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
+ connect_state->fd = sock;
+ qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
+ connect_state);
+ *in_progress = true;
} else if (rc < 0) {
closesocket(sock);
return -1;
@@ -260,6 +314,7 @@ static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
const char *port;
memset(&ai, 0, sizeof(ai));
+
ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
@@ -296,36 +351,55 @@ static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
*
* @opts: QEMU options, recognized parameters strings "host" and "port",
* bools "ipv4" and "ipv6".
- * @block: set true for blocking socket
- * @in_progress: set to true in case of ongoing connect
* @errp: set on error
+ * @callback: callback function for non-blocking connect
+ * @opaque: opaque for callback function
*
* Returns: -1 on error, file descriptor on success.
+ *
+ * If @callback is non-null, the connect is non-blocking. If this
+ * function succeeds, callback will be called when the connection
+ * completes, with the file descriptor on success, or -1 on error.
*/
-int inet_connect_opts(QemuOpts *opts, bool block, bool *in_progress,
- Error **errp)
+int inet_connect_opts(QemuOpts *opts, Error **errp,
+ NonBlockingConnectHandler *callback, void *opaque)
{
struct addrinfo *res, *e;
int sock = -1;
+ bool in_progress;
+ ConnectState *connect_state = NULL;
res = inet_parse_connect_opts(opts, errp);
if (!res) {
return -1;
}
- if (in_progress) {
- *in_progress = false;
+ if (callback != NULL) {
+ connect_state = g_malloc0(sizeof(*connect_state));
+ connect_state->addr_list = res;
+ connect_state->callback = callback;
+ connect_state->opaque = opaque;
}
for (e = res; e != NULL; e = e->ai_next) {
- sock = inet_connect_addr(e, block, in_progress);
- if (sock >= 0) {
+ if (connect_state != NULL) {
+ connect_state->current_addr = e;
+ }
+ sock = inet_connect_addr(e, &in_progress, connect_state);
+ if (in_progress) {
+ return sock;
+ } else if (sock >= 0) {
+ /* non blocking socket immediate success, call callback */
+ if (callback != NULL) {
+ callback(sock, opaque);
+ }
break;
}
}
if (sock < 0) {
error_set(errp, QERR_SOCKET_CONNECT_FAILED);
}
+ g_free(connect_state);
freeaddrinfo(res);
return sock;
}
@@ -538,7 +612,7 @@ int inet_connect(const char *str, Error **errp)
opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
if (inet_parse(opts, str) == 0) {
- sock = inet_connect_opts(opts, true, NULL, errp);
+ sock = inet_connect_opts(opts, errp, NULL, NULL);
} else {
error_set(errp, QERR_SOCKET_CREATE_FAILED);
}
@@ -548,22 +622,29 @@ int inet_connect(const char *str, Error **errp)
/**
* Create a non-blocking socket and connect it to an address.
+ * Calls the callback function with fd in case of success or -1 in case of
+ * error.
*
* @str: address string
- * @in_progress: set to true in case of ongoing connect
+ * @callback: callback function that is called when connect completes,
+ * cannot be NULL.
+ * @opaque: opaque for callback function
* @errp: set in case of an error
*
- * Returns: -1 on error, file descriptor on success.
+ * Returns: -1 on immediate error, file descriptor on success.
**/
-int inet_nonblocking_connect(const char *str, bool *in_progress,
- Error **errp)
+int inet_nonblocking_connect(const char *str,
+ NonBlockingConnectHandler *callback,
+ void *opaque, Error **errp)
{
QemuOpts *opts;
int sock = -1;
+ g_assert(callback != NULL);
+
opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
if (inet_parse(opts, str) == 0) {
- sock = inet_connect_opts(opts, false, in_progress, errp);
+ sock = inet_connect_opts(opts, errp, callback, opaque);
} else {
error_set(errp, QERR_SOCKET_CREATE_FAILED);
}
diff --git a/qemu_socket.h b/qemu_socket.h
index 80696aa6d8..3e8aee9cad 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -38,15 +38,21 @@ void socket_set_block(int fd);
void socket_set_nonblock(int fd);
int send_all(int fd, const void *buf, int len1);
-/* New, ipv6-ready socket helper functions, see qemu-sockets.c */
+/* callback function for nonblocking connect
+ * valid fd on success, negative error code on failure
+ */
+typedef void NonBlockingConnectHandler(int fd, void *opaque);
+
int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp);
int inet_listen(const char *str, char *ostr, int olen,
int socktype, int port_offset, Error **errp);
-int inet_connect_opts(QemuOpts *opts, bool block, bool *in_progress,
- Error **errp);
+int inet_connect_opts(QemuOpts *opts, Error **errp,
+ NonBlockingConnectHandler *callback, void *opaque);
int inet_connect(const char *str, Error **errp);
-int inet_nonblocking_connect(const char *str, bool *in_progress,
- Error **errp);
+int inet_nonblocking_connect(const char *str,
+ NonBlockingConnectHandler *callback,
+ void *opaque, Error **errp);
+
int inet_dgram_opts(QemuOpts *opts);
const char *inet_strfamily(int family);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 18:36:10 +0000