提交 2011fe56 编写于 作者: A Anthony Liguori

char: document the functions that will be the public interface

Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
上级 903396ad
......@@ -76,33 +76,156 @@ struct CharDriverState {
QTAILQ_ENTRY(CharDriverState) next;
};
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
/**
* @qemu_chr_new_from_opts:
*
* Create a new character backend from a QemuOpts list.
*
* @opts see qemu-config.c for a list of valid options
* @init not sure..
*
* Returns: a new character backend
*/
CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
void (*init)(struct CharDriverState *s));
CharDriverState *qemu_chr_new(const char *label, const char *filename, void (*init)(struct CharDriverState *s));
/**
* @qemu_chr_new:
*
* Create a new character backend from a URI.
*
* @label the name of the backend
* @filename the URI
* @init not sure..
*
* Returns: a new character backend
*/
CharDriverState *qemu_chr_new(const char *label, const char *filename,
void (*init)(struct CharDriverState *s));
/**
* @qemu_chr_delete:
*
* Destroy a character backend.
*/
void qemu_chr_delete(CharDriverState *chr);
/**
* @qemu_chr_fe_set_echo:
*
* Ask the backend to override its normal echo setting. This only really
* applies to the stdio backend and is used by the QMP server such that you
* can see what you type if you try to type QMP commands.
*
* @echo true to enable echo, false to disable echo
*/
void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);
/**
* @qemu_chr_fe_open:
*
* Open a character backend. This function call is an indication that the
* front end is ready to begin doing I/O.
*/
void qemu_chr_fe_open(struct CharDriverState *chr);
/**
* @qemu_chr_fe_close:
*
* Close a character backend. This function call indicates that the front end
* no longer is able to process I/O. To process I/O again, the front end will
* call @qemu_chr_fe_open.
*/
void qemu_chr_fe_close(struct CharDriverState *chr);
void qemu_chr_delete(CharDriverState *chr);
/**
* @qemu_chr_fe_printf:
*
* Write to a character backend using a printf style interface.
*
* @fmt see #printf
*/
void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
GCC_FMT_ATTR(2, 3);
/**
* @qemu_chr_fe_write:
*
* Write data to a character backend from the front end. This function will
* send data from the front end to the back end.
*
* @buf the data
* @len the number of bytes to send
*
* Returns: the number of bytes consumed
*/
int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
/**
* @qemu_chr_fe_ioctl:
*
* Issue a device specific ioctl to a backend.
*
* @cmd see CHR_IOCTL_*
* @arg the data associated with @cmd
*
* Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
* return value depends on the semantics of @cmd
*/
int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
/**
* @qemu_chr_fe_get_msgfd:
*
* For backends capable of fd passing, return the latest file descriptor passed
* by a client.
*
* Returns: -1 if fd passing isn't supported or there is no pending file
* descriptor. If a file descriptor is returned, subsequent calls to
* this function will return -1 until a client sends a new file
* descriptor.
*/
int qemu_chr_fe_get_msgfd(CharDriverState *s);
/**
* @qemu_chr_be_can_write:
*
* Determine how much data the front end can currently accept. This function
* returns the number of bytes the front end can accept. If it returns 0, the
* front end cannot receive data at the moment. The function must be polled
* to determine when data can be received.
*
* Returns: the number of bytes the front end can receive via @qemu_chr_be_write
*/
int qemu_chr_be_can_write(CharDriverState *s);
/**
* @qemu_chr_be_write:
*
* Write data from the back end to the front end. Before issuing this call,
* the caller should call @qemu_chr_be_can_write to determine how much data
* the front end can currently accept.
*
* @buf a buffer to receive data from the front end
* @len the number of bytes to receive from the front end
*/
void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
void qemu_chr_add_handlers(CharDriverState *s,
IOCanReadHandler *fd_can_read,
IOReadHandler *fd_read,
IOEventHandler *fd_event,
void *opaque);
int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
void qemu_chr_generic_open(CharDriverState *s);
int qemu_chr_be_can_write(CharDriverState *s);
void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
int qemu_chr_fe_get_msgfd(CharDriverState *s);
void qemu_chr_accept_input(CharDriverState *s);
int qemu_chr_add_client(CharDriverState *s, int fd);
void qemu_chr_info_print(Monitor *mon, const QObject *ret_data);
void qemu_chr_info(Monitor *mon, QObject **ret_data);
CharDriverState *qemu_chr_find(const char *name);
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
/* add an eventfd to the qemu devices that are polled */
CharDriverState *qemu_chr_open_eventfd(int eventfd);
......
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