Merge remote-tracking branch 'remotes/berrange/tags/io-channel-3-for-upstream' into staging

Merge io-channels-3 partial branch

# gpg: Signature made Tue 20 Oct 2015 16:36:10 BST using RSA key ID 15104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>"

* remotes/berrange/tags/io-channel-3-for-upstream:
  util: pull Buffer code out of VNC module
  coroutine: move into libqemuutil.a library
  osdep: add qemu_fork() wrapper for safely handling signals
  ui: convert VNC startup code to use SocketAddress
  sockets: allow port to be NULL when listening on IP address
  sockets: move qapi_copy_SocketAddress into qemu-sockets.c
  sockets: add helpers for creating SocketAddress from a socket

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

7 files changed, 171 insertions, 3 deletions

diff --git a/include/block/block.h b/include/block/block.h
index 6d70eb4..84f05ad 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -4,7 +4,7 @@
 #include "block/aio.h"
 #include "qemu-common.h"
 #include "qemu/option.h"
-#include "block/coroutine.h"
+#include "qemu/coroutine.h"
 #include "block/accounting.h"
 #include "qapi/qmp/qobject.h"
 #include "qapi-types.h"
diff --git a/include/block/block_int.h b/include/block/block_int.h
index c0e6513..a480f94 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -28,7 +28,7 @@
 #include "block/block.h"
 #include "qemu/option.h"
 #include "qemu/queue.h"
-#include "block/coroutine.h"
+#include "qemu/coroutine.h"
 #include "qemu/timer.h"
 #include "qapi-types.h"
 #include "qemu/hbitmap.h"
diff --git a/include/qemu/buffer.h b/include/qemu/buffer.h
new file mode 100644
index 0000000..b380cec
--- /dev/null
+++ b/include/qemu/buffer.h
@@ -0,0 +1,118 @@
+/*
+ * QEMU generic buffers
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef QEMU_BUFFER_H__
+#define QEMU_BUFFER_H__
+
+#include "qemu-common.h"
+
+typedef struct Buffer Buffer;
+
+/**
+ * Buffer:
+ *
+ * The Buffer object provides a simple dynamically resizing
+ * array, with separate tracking of capacity and usage. This
+ * is typically useful when buffering I/O or processing data.
+ */
+
+struct Buffer {
+    size_t capacity;
+    size_t offset;
+    uint8_t *buffer;
+};
+
+/**
+ * buffer_reserve:
+ * @buffer: the buffer object
+ * @len: the minimum required free space
+ *
+ * Ensure that the buffer has space allocated for at least
+ * @len bytes. If the current buffer is too small, it will
+ * be reallocated, possibly to a larger size than requested.
+ */
+void buffer_reserve(Buffer *buffer, size_t len);
+
+/**
+ * buffer_reset:
+ * @buffer: the buffer object
+ *
+ * Reset the length of the stored data to zero, but do
+ * not free / reallocate the memory buffer
+ */
+void buffer_reset(Buffer *buffer);
+
+/**
+ * buffer_free:
+ * @buffer: the buffer object
+ *
+ * Reset the length of the stored data to zero and also
+ * free the internal memory buffer
+ */
+void buffer_free(Buffer *buffer);
+
+/**
+ * buffer_append:
+ * @buffer: the buffer object
+ * @data: the data block to append
+ * @len: the length of @data in bytes
+ *
+ * Append the contents of @data to the end of the buffer.
+ * The caller must ensure that the buffer has sufficient
+ * free space for @len bytes, typically by calling the
+ * buffer_reserve() method prior to appending.
+ */
+void buffer_append(Buffer *buffer, const void *data, size_t len);
+
+/**
+ * buffer_advance:
+ * @buffer: the buffer object
+ * @len: the number of bytes to skip
+ *
+ * Remove @len bytes of data from the head of the buffer.
+ * The internal buffer will not be reallocated, so will
+ * have at least @len bytes of free space after this
+ * call completes
+ */
+void buffer_advance(Buffer *buffer, size_t len);
+
+/**
+ * buffer_end:
+ * @buffer: the buffer object
+ *
+ * Get a pointer to the tail end of the internal buffer
+ * The returned pointer is only valid until the next
+ * call to buffer_reserve().
+ *
+ * Returns: the tail of the buffer
+ */
+uint8_t *buffer_end(Buffer *buffer);
+
+/**
+ * buffer_empty:
+ * @buffer: the buffer object
+ *
+ * Determine if the buffer contains any current data
+ *
+ * Returns: true if the buffer holds data, false otherwise
+ */
+gboolean buffer_empty(Buffer *buffer);
+
+#endif /* QEMU_BUFFER_H__ */
diff --git a/include/block/coroutine.h b/include/qemu/coroutine.h
index 20c027a..20c027a 100644
--- a/include/block/coroutine.h
+++ b/include/qemu/coroutine.h
diff --git a/include/block/coroutine_int.h b/include/qemu/coroutine_int.h
index 9aa1aae..42d6838 100644
--- a/include/block/coroutine_int.h
+++ b/include/qemu/coroutine_int.h
@@ -26,7 +26,7 @@
 #define QEMU_COROUTINE_INT_H
 
 #include "qemu/queue.h"
-#include "block/coroutine.h"
+#include "qemu/coroutine.h"
 
 typedef enum {
     COROUTINE_YIELD = 1,
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index ef21efb..b568424 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -69,6 +69,8 @@
 #include "sysemu/os-posix.h"
 #endif
 
+#include "qapi/error.h"
+
 #if defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10
 /* [u]int_fast*_t not in <sys/int_types.h> */
 typedef unsigned char           uint_fast8_t;
@@ -286,4 +288,18 @@ void os_mem_prealloc(int fd, char *area, size_t sz);
 
 int qemu_read_password(char *buf, int buf_size);
 
+/**
+ * qemu_fork:
+ *
+ * A version of fork that avoids signal handler race
+ * conditions that can lead to child process getting
+ * signals that are otherwise only expected by the
+ * parent. It also resets all signal handlers to the
+ * default settings.
+ *
+ * Returns 0 to child process, pid number to parent
+ * or -1 on failure.
+ */
+pid_t qemu_fork(Error **errp);
+
 #endif
diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index c174b5c..5a183c5 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -88,4 +88,38 @@ int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp);
 int parse_host_port(struct sockaddr_in *saddr, const char *str);
 int socket_init(void);
 
+/**
+ * socket_local_address:
+ * @fd: the socket file handle
+ * @errp: pointer to uninitialized error object
+ *
+ * Get the string representation of the local socket
+ * address. A pointer to the allocated address information
+ * struct will be returned, which the caller is required to
+ * release with a call qapi_free_SocketAddress when no
+ * longer required.
+ *
+ * Returns: the socket address struct, or NULL on error
+ */
+SocketAddress *socket_local_address(int fd, Error **errp);
+
+/**
+ * socket_remote_address:
+ * @fd: the socket file handle
+ * @errp: pointer to uninitialized error object
+ *
+ * Get the string representation of the remote socket
+ * address. A pointer to the allocated address information
+ * struct will be returned, which the caller is required to
+ * release with a call qapi_free_SocketAddress when no
+ * longer required.
+ *
+ * Returns: the socket address struct, or NULL on error
+ */
+SocketAddress *socket_remote_address(int fd, Error **errp);
+
+
+void qapi_copy_SocketAddress(SocketAddress **p_dest,
+                             SocketAddress *src);
+
 #endif /* QEMU_SOCKET_H */