Add simple helpers to correctly report failures from read/write routines
using the return -errno style.
Signed-off-by: John Levon <john.le...@nutanix.com>
---
include/hw/vfio/vfio-device.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h
index a7eaaa31e7..4a32202943 100644
--- a/include/hw/vfio/vfio-device.h
+++ b/include/hw/vfio/vfio-device.h
@@ -115,6 +115,20 @@ struct VFIODeviceOps {
int (*vfio_load_config)(VFIODevice *vdev, QEMUFile *f);
};
+/*
+ * Given a return value of either a short number of bytes read or -errno,
+ * construct a meaningful error message.
+ */
+#define strreaderror(ret) \
+ (ret < 0 ? strerror(-ret) : "short read")
+
+/*
+ * Given a return value of either a short number of bytes written or -errno,
+ * construct a meaningful error message.
+ */
+#define strwriteerror(ret) \
+ (ret < 0 ? strerror(-ret) : "short write")
+
void vfio_device_irq_disable(VFIODevice *vbasedev, int index);
void vfio_device_irq_unmask(VFIODevice *vbasedev, int index);
void vfio_device_irq_mask(VFIODevice *vbasedev, int index);
--
2.43.0
