Document why this function exists and meaning of return values.

Signed-off-by: Peter Krempa <pkre...@redhat.com>
---
 src/qemu/qemu_domain.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 9bbad887e0..8fe1b1924d 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -12368,6 +12368,18 @@ qemuDomainRemoveLogs(virQEMUDriver *driver,
 }


+/**
+ * qemuDomainObjWait:
+ * @vm: domain object
+ *
+ * Wait for a signal on the main domain condition. Take into account internal
+ * qemu state in addition to what virDomainObjWait checks. Code in the qemu
+ * driver must use this function exclusively instead of virDomainObjWait.
+ *
+ * Returns:
+ *  - 0 on successful wait AND VM is guaranteed to be running
+ *  - -1 on failure to wait or VM was terminated while waiting
+ */
 int
 qemuDomainObjWait(virDomainObj *vm)
 {
-- 
2.45.2

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