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From da3039bc7ec4fda6719be3bdd10f4b0fdaceb17a Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Fri, 16 Jan 2015 17:35:35 +0100
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Subject: [PATCH 03/16] socket shutdown
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Message-id: <1421429737-23581-2-git-send-email-dgilbert@redhat.com>
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Patchwork-id: 63332
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O-Subject: [RHEL-7.2 qemu-kvm PATCH 1/3] socket shutdown
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Bugzilla: 1086168
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Amit Shah <amit.shah@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Add QEMUFile interface to allow a socket to be 'shut down' - i.e. any
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reads/writes will fail (and any blocking read/write will be woken).
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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Reviewed-by: Amit Shah <amit.shah@redhat.com>
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Signed-off-by: Amit Shah <amit.shah@redhat.com>
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(cherry picked from commit e1a8c9b67fc97d293211773edcae9e8e2f3367ab)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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	include/migration/qemu-file.h
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	migration/qemu-file-unix.c
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	migration/qemu-file.c
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   Because we split qemu-file.c out of savevm and moved it
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---
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 include/migration/qemu-file.h | 10 ++++++++++
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 include/qemu/sockets.h        |  7 +++++++
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 savevm.c                      | 33 +++++++++++++++++++++++++++++----
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 3 files changed, 46 insertions(+), 4 deletions(-)
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diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
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index 0f757fb..032de47 100644
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--- a/include/migration/qemu-file.h
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+++ b/include/migration/qemu-file.h
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@@ -82,6 +82,14 @@ typedef size_t (QEMURamSaveFunc)(QEMUFile *f, void *opaque,
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                                size_t size,
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                                int *bytes_sent);
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+/*
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+ * Stop any read or write (depending on flags) on the underlying
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+ * transport on the QEMUFile.
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+ * Existing blocking reads/writes must be woken
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+ * Returns 0 on success, -err on error
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+ */
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+typedef int (QEMUFileShutdownFunc)(void *opaque, bool rd, bool wr);
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+
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 typedef struct QEMUFileOps {
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     QEMUFilePutBufferFunc *put_buffer;
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     QEMUFileGetBufferFunc *get_buffer;
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@@ -92,6 +100,7 @@ typedef struct QEMUFileOps {
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     QEMURamHookFunc *after_ram_iterate;
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     QEMURamHookFunc *hook_ram_load;
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     QEMURamSaveFunc *save_page;
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+    QEMUFileShutdownFunc *shut_down;
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 } QEMUFileOps;
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 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
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@@ -141,6 +150,7 @@ void qemu_file_reset_rate_limit(QEMUFile *f);
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 void qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate);
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 int64_t qemu_file_get_rate_limit(QEMUFile *f);
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 int qemu_file_get_error(QEMUFile *f);
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+int qemu_file_shutdown(QEMUFile *f);
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 void qemu_fflush(QEMUFile *f);
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 static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
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diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
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index c5174d7..729ff52 100644
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--- a/include/qemu/sockets.h
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+++ b/include/qemu/sockets.h
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@@ -42,6 +42,13 @@ void qemu_set_nonblock(int fd);
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 int send_all(int fd, const void *buf, int len1);
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 int recv_all(int fd, void *buf, int len1, bool single_read);
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+#ifdef WIN32
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+/* Windows has different names for the same constants with the same values */
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+#define SHUT_RD   0
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+#define SHUT_WR   1
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+#define SHUT_RDWR 2
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+#endif
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+
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 /* callback function for nonblocking connect
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  * valid fd on success, negative error code on failure
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  */
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diff --git a/savevm.c b/savevm.c
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index 963dc7d..731d5c0 100644
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--- a/savevm.c
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+++ b/savevm.c
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@@ -204,6 +204,17 @@ static int socket_close(void *opaque)
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     return 0;
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 }
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+static int socket_shutdown(void *opaque, bool rd, bool wr)
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+{
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+    QEMUFileSocket *s = opaque;
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+
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+    if (shutdown(s->fd, rd ? (wr ? SHUT_RDWR : SHUT_RD) : SHUT_WR)) {
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+        return -errno;
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+    } else {
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+        return 0;
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+    }
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+}
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+
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 static int stdio_get_fd(void *opaque)
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 {
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     QEMUFileStdio *s = opaque;
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@@ -448,17 +459,31 @@ QEMUFile *qemu_fdopen(int fd, const char *mode)
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 }
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 static const QEMUFileOps socket_read_ops = {
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-    .get_fd =     socket_get_fd,
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+    .get_fd     = socket_get_fd,
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     .get_buffer = socket_get_buffer,
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-    .close =      socket_close
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+    .close      = socket_close,
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+    .shut_down  = socket_shutdown
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 };
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 static const QEMUFileOps socket_write_ops = {
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-    .get_fd =     socket_get_fd,
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+    .get_fd        = socket_get_fd,
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     .writev_buffer = socket_writev_buffer,
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-    .close =      socket_close
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+    .close         = socket_close,
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+    .shut_down     = socket_shutdown
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 };
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+/*
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+ * Stop a file from being read/written - not all backing files can do this
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+ * typically only sockets can.
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+ */
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+int qemu_file_shutdown(QEMUFile *f)
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+{
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+    if (!f->ops->shut_down) {
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+        return -ENOSYS;
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+    }
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+    return f->ops->shut_down(f->opaque, true, true);
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+}
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+
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 bool qemu_file_mode_is_not_valid(const char *mode)
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 {
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     if (mode == NULL ||
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-- 
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1.8.3.1
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