Live migration for Win32 (Hervé Poussineau)

This patch fixes migration so that it works on Win32.  This requires using
socket specific calls since sockets cannot be treated like file descriptors
on win32.
Signed-off-by: NHervé Poussineau <hpoussin@reactos.org>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5525 c046a42c-6fe2-441c-8c8c-71466251a162

hw/hw.h

@@ -34,7 +34,7 @@ QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
                          QEMUFileCloseFunc *close,
                          QEMUFileRateLimit *rate_limit);
 QEMUFile *qemu_fopen(const char *filename, const char *mode);
-QEMUFile *qemu_fopen_fd(int fd);
+QEMUFile *qemu_fopen_socket(int fd);
 void qemu_fflush(QEMUFile *f);
 int qemu_fclose(QEMUFile *f);
 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);

migration-tcp.c

@@ -85,10 +85,10 @@ static ssize_t fd_put_buffer(void *opaque, const void *data, size_t size)
 
     do {
         ret = send(s->fd, data, size, 0);
-    } while (ret == -1 && errno == EINTR);
+    } while (ret == -1 && (socket_error() == EINTR || socket_error() == EWOULDBLOCK));
 
     if (ret == -1)
-        ret = -errno;
+        ret = -socket_error();
 
     if (ret == -EAGAIN)
         qemu_set_fd_handler2(s->fd, NULL, NULL, fd_put_notify, s);
@@ -123,7 +123,7 @@ static void fd_wait_for_unfreeze(void *opaque)
         FD_SET(s->fd, &wfds);
 
         ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
-    } while (ret == -1 && errno == EINTR);
+    } while (ret == -1 && socket_error() == EINTR);
 }
 
 static void fd_put_ready(void *opaque)
@@ -178,7 +178,7 @@ static void tcp_wait_for_connect(void *opaque)
     dprintf("connect completed\n");
     do {
         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
-    } while (ret == -1 && errno == EINTR);
+    } while (ret == -1 && socket_error() == EINTR);
 
     if (ret < 0) {
 	tcp_error(s);
@@ -273,13 +273,13 @@ MigrationState *tcp_start_outgoing_migration(const char *host_port,
     do {
         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
         if (ret == -1)
-            ret = -errno;
+            ret = -socket_error();
 
-        if (ret == -EINPROGRESS)
+        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
     } while (ret == -EINTR);
 
-    if (ret < 0 && ret != -EINPROGRESS) {
+    if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
         dprintf("connect failed\n");
         close(s->fd);
         qemu_free(s);
@@ -300,7 +300,7 @@ static void tcp_accept_incoming_migration(void *opaque)
 
     do {
         c = accept(s, (struct sockaddr *)&addr, &addrlen);
-    } while (c == -1 && errno == EINTR);
+    } while (c == -1 && socket_error() == EINTR);
 
     dprintf("accepted migration\n");
 
@@ -309,7 +309,7 @@ static void tcp_accept_incoming_migration(void *opaque)
         return;
     }
 
-    f = qemu_fopen_fd(c);
+    f = qemu_fopen_socket(c);
     if (f == NULL) {
         fprintf(stderr, "could not qemu_fopen socket\n");
         goto out;
@@ -349,7 +349,7 @@ int tcp_start_incoming_migration(const char *host_port)
 
     s = socket(PF_INET, SOCK_STREAM, 0);
     if (s == -1)
-        return -errno;
+        return -socket_error();
 
     val = 1;
     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
@@ -367,5 +367,5 @@ int tcp_start_incoming_migration(const char *host_port)
 
 err:
     close(s);
-    return -errno;
+    return -socket_error();
 }

vl.c

@@ -6252,43 +6252,43 @@ struct QEMUFile {
     int has_error;
 };
 
-typedef struct QEMUFileFD
+typedef struct QEMUFileSocket
 {
     int fd;
     QEMUFile *file;
-} QEMUFileFD;
+} QEMUFileSocket;
 
-static int fd_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
+static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 {
-    QEMUFileFD *s = opaque;
+    QEMUFileSocket *s = opaque;
     ssize_t len;
 
     do {
-        len = read(s->fd, buf, size);
-    } while (len == -1 && errno == EINTR);
+        len = recv(s->fd, buf, size, 0);
+    } while (len == -1 && socket_error() == EINTR);
 
     if (len == -1)
-        len = -errno;
+        len = -socket_error();
 
     return len;
 }
 
-static int fd_close(void *opaque)
+static int socket_close(void *opaque)
 {
-    QEMUFileFD *s = opaque;
+    QEMUFileSocket *s = opaque;
     qemu_free(s);
     return 0;
 }
 
-QEMUFile *qemu_fopen_fd(int fd)
+QEMUFile *qemu_fopen_socket(int fd)
 {
-    QEMUFileFD *s = qemu_mallocz(sizeof(QEMUFileFD));
+    QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 
     if (s == NULL)
         return NULL;
 
     s->fd = fd;
-    s->file = qemu_fopen_ops(s, NULL, fd_get_buffer, fd_close, NULL);
+    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL);
     return s->file;
 }