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migration: introduce set_blocking function in QEMUFileOps

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Remove the assumption that every QEMUFile implementation has
a file descriptor available by introducing a new function
in QEMUFileOps to change the blocking state of a QEMUFile.

If not set, it will fallback to the original code using
the get_fd method.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <1461751518-12128-7-git-send-email-berrange@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-04-27 11:04:56 +01:00 • committed by Amit Shah
parent 0436e09f96
commit 06ad513532
3 changed files with 13 additions and 6 deletions
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5
include/migration/qemu-file.h
View file

@ -54,6 +54,10 @@ typedef int (QEMUFileCloseFunc)(void *opaque);
*/
typedef int (QEMUFileGetFD)(void *opaque);
/* Called to change the blocking mode of the file
*/
typedef int (QEMUFileSetBlocking)(void *opaque, bool enabled);
/*
* This function writes an iovec to file. The handler must write all
* of the data or return a negative errno value.
@ -107,6 +111,7 @@ typedef struct QEMUFileOps {
QEMUFileGetBufferFunc *get_buffer;
QEMUFileCloseFunc *close;
QEMUFileGetFD *get_fd;
QEMUFileSetBlocking *set_blocking;
QEMUFileWritevBufferFunc *writev_buffer;
QEMURetPathFunc *get_return_path;
QEMUFileShutdownFunc *shut_down;