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qga: Support enum names in guest-file-seek

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Magic constants are a pain to use, especially when we run the
risk that our choice of '1' for QGA_SEEK_CUR might differ from
the host or guest's choice of SEEK_CUR.  Better is to use an
enum value, via a qapi alternate type for back-compatibility.

With this,
 {"command":"guest-file-seek", "arguments":{"handle":1,
  "offset":0, "whence":"cur"}}
becomes a synonym for the older
 {"command":"guest-file-seek", "arguments":{"handle":1,
  "offset":0, "whence":1}}

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Eric Blake 2016-02-09 14:27:16 -07:00 • committed by Michael Roth
parent 774ae4254d
commit 0b4b49387c
6 changed files with 70 additions and 40 deletions
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9
qga/guest-agent-core.h
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@ -12,16 +12,10 @@
*/
#include "qapi/qmp/dispatch.h"
#include "qemu-common.h"
#include "qga-qmp-commands.h"
#define QGA_READ_COUNT_DEFAULT 4096
/* Mapping of whence codes used by guest-file-seek. */
enum {
QGA_SEEK_SET = 0,
QGA_SEEK_CUR = 1,
QGA_SEEK_END = 2,
};
typedef struct GAState GAState;
typedef struct GACommandState GACommandState;
extern GAState *ga_state;
@ -44,6 +38,7 @@ void ga_set_frozen(GAState *s);
void ga_unset_frozen(GAState *s);
const char *ga_fsfreeze_hook(GAState *s);
int64_t ga_get_fd_handle(GAState *s, Error **errp);
int ga_parse_whence(GuestFileWhence *whence, Error **errp);
#ifndef _WIN32
void reopen_fd_to_null(int fd);