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Add wrapper for setting blocking status on a QEMUFile 

Add a wrapper to change the blocking status on a QEMUFile
rather than having to use qemu_set_block(qemu_get_fd(f));
it seems best to avoid exposing the fd since not all QEMUFile's
really have one.  With this wrapper we could move the implementation
down to be different on different transports.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2015-11-05 18:10:36 +00:00 committed by Juan Quintela
parent 9504fb510c
commit a800cd5c38
2 changed files with 16 additions and 0 deletions
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1
include/migration/qemu-file.h
View File

@ -197,6 +197,7 @@ int qemu_file_get_error(QEMUFile *f);
void qemu_file_set_error(QEMUFile *f, int ret); void qemu_file_set_error(QEMUFile *f, int ret);
int qemu_file_shutdown(QEMUFile *f); int qemu_file_shutdown(QEMUFile *f);
void qemu_fflush(QEMUFile *f); void qemu_fflush(QEMUFile *f);
void qemu_file_set_blocking(QEMUFile *f, bool block);
static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv) static inline void qemu_put_be64s(QEMUFile *f, const uint64_t *pv)
{ {

15
migration/qemu-file.c
View File

@ -648,3 +648,18 @@ size_t qemu_get_counted_string(QEMUFile *f, char buf[256])
return res == len ? res : 0; return res == len ? res : 0;
} }
/*
* Set the blocking state of the QEMUFile.
* Note: On some transports the OS only keeps a single blocking state for
* both directions, and thus changing the blocking on the main
* QEMUFile can also affect the return path.
*/
void qemu_file_set_blocking(QEMUFile *f, bool block)
{
if (block) {
qemu_set_block(qemu_get_fd(f));
} else {
qemu_set_nonblock(qemu_get_fd(f));
}
}