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migrate.c: migrate_fd_put_buffer: Do not busyloop: stop writing if EWOULDBLOCK

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The migration code is non-blocking, designed for live migration.

Practically migrate_fd_put_buffer busy-loops trying to write, as
on many machines EWOULDBLOCK==EAGAIN (look in include/asm-generic/errno.h).

Signed-off-by: Uri Lublin <uril@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Uri Lublin 2009-05-19 14:08:53 +03:00 committed by Anthony Liguori
parent dc0be040c2
commit 3978d7b4c8
1 changed files with 1 additions and 1 deletions
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2
migration.c
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@ -168,7 +168,7 @@ ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size)
do {
ret = s->write(s, data, size);
} while (ret == -1 && ((s->get_error(s)) == EINTR || (s->get_error(s)) == EWOULDBLOCK));
} while (ret == -1 && ((s->get_error(s)) == EINTR));
if (ret == -1)
ret = -(s->get_error(s));