Hi All,
When I looked into more functions passing 'Error **',
I see many are in "int testfunc(..., Error **errp)" format. I was a bit
confused.
The qapi/error.h suggests:
* - Whenever practical, also return a value that indicates success /
* failure. This can make the error checking more concise, and can
* avoid useless error object creation and destruction. Note that
* we still have many functions returning void. We recommend
* • bool-valued functions return true on success / false on failure,
* • pointer-valued functions return non-null / null pointer, and
* • integer-valued functions return non-negative / negative.
There are some functions like:
int testfunc(..., Error **errp)
{
If (succeed) {
return 0;
} else {
return -EINVAL;
}
}
Does testfunc() follow 'integer-valued functions' as above or it should be
changed to 'bool-valued functions'?
Is there a clear rule in which case to change 'int testfunc(... Error **errp)'
to ' bool testfunc(... Error **errp)'?
Thanks
Zhenzhong
>-----Original Message-----
>From: Duan, Zhenzhong <zhenzhong.d...@intel.com>
><zhenzhong.d...@intel.com>
>Subject: [PATCH v2 00/11] VFIO: misc cleanups
>
>Hi
>
>This is a cleanup series to change functions in hw/vfio/ to return bool
>when the error is passed through errp parameter, also some cleanup
>with g_autofree.
>
>See discussion at https://lists.gnu.org/archive/html/qemu-devel/2024-
>04/msg04782.html
>
>This series processed below files:
>hw/vfio/container.c
>hw/vfio/iommufd.c
>hw/vfio/cpr.c
>backends/iommufd.c
>
>So above files are clean now, there are still other files need processing
>in hw/vfio.
>
>Test done on x86 platform:
>vfio device hotplug/unplug with different backend
>reboot
>
>Thanks
>Zhenzhong
>
>Changelog:
>v2:
>- split out g_autofree code as a patch (Cédric)
>- add processing for more files
>
>Zhenzhong Duan (11):
> vfio/pci: Use g_autofree in vfio_realize
> vfio/pci: Use g_autofree in iommufd_cdev_get_info_iova_range()
> vfio: Make VFIOIOMMUClass::attach_device() and its wrapper return bool
> vfio: Make VFIOIOMMUClass::setup() return bool
> vfio: Make VFIOIOMMUClass::add_window() and its wrapper return bool
> vfio/container: Make vfio_connect_container() return bool
> vfio/container: Make vfio_set_iommu() return bool
> vfio/container: Make vfio_get_device() return bool
> vfio/iommufd: Make iommufd_cdev_*() return bool
> vfio/cpr: Make vfio_cpr_register_container() return bool
> backends/iommufd: Make iommufd_backend_*() return bool
>
> include/hw/vfio/vfio-common.h | 6 +-
> include/hw/vfio/vfio-container-base.h | 18 ++---
> include/sysemu/iommufd.h | 6 +-
> backends/iommufd.c | 29 +++----
> hw/vfio/ap.c | 6 +-
> hw/vfio/ccw.c | 6 +-
> hw/vfio/common.c | 6 +-
> hw/vfio/container-base.c | 8 +-
> hw/vfio/container.c | 81 +++++++++----------
> hw/vfio/cpr.c | 4 +-
> hw/vfio/iommufd.c | 109 +++++++++++---------------
> hw/vfio/pci.c | 12 ++-
> hw/vfio/platform.c | 7 +-
> hw/vfio/spapr.c | 28 +++----
> backends/trace-events | 4 +-
> 15 files changed, 147 insertions(+), 183 deletions(-)
>
>--
>2.34.1
