[Qemu-devel] [PATCH V4 0/3] qemu-iotests: add test for fd passing via SCM rights

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

This series add test case for fd passing with unix socket at runtime. Since
getfd and closefd interface will interact with monitor's data, so it will
help to do regression test for monitor patches. Since python2 do not support
sendmsg(), so a C helper program is added to do the job.

v2:
  1: add missing $ in the makefile rule.

v3:
  Address Eric's comments:
  1: typo fix, remove "." in the end of error message, strick
check argc as "!=", use EXIT_SUCCESS and EXIT_FAILURE as exit
values, strict error check for strtol() call.
  Address Luiz's comments:
  1: change the helper program parameter as "bin < socket-fd > < file-path >",
the program open the file itself now, data parameter is removed and blank
is always used as iov data, better usage tip message, folder the string parsing
code into a function.
  2: related change for helper program parameter change.
  3: related change for helper program parameter change.
  Other:
  1: remove "LINK" rule in makefile, remove fd checking code inside send_fd()
since it is already checked before calling, add '' around %s for path and
number string in error message.
  2: renamed fd_bin to bin in send_fd_scm() to tip better, add '' around %s
for path in error message.
v4:
  Address Stefan's comments:
  2: add space after # for comments, refined the comment's grammar.
  3: add space after # for comments, refined the comment's grammar, add two
test cases for error path.

Wenchao Xia (3):
  1 qemu-iotests: add unix socket help program
  2 qemu-iotests: add infrastructure of fd passing via SCM
  3 qemu-iotests: add tests for runtime fd passing via SCM rights

 QMP/qmp.py                             |    6 ++
 configure                              |    2 +-
 tests/Makefile                         |    3 +-
 tests/qemu-iotests/045                 |   51 ++++++++++++-
 tests/qemu-iotests/045.out             |    4 +-
 tests/qemu-iotests/check               |    1 +
 tests/qemu-iotests/iotests.py          |   23 ++++++
 tests/qemu-iotests/socket_scm_helper.c |  135 ++++++++++++++++++++++++++++++++
 8 files changed, 220 insertions(+), 5 deletions(-)
 create mode 100644 tests/qemu-iotests/socket_scm_helper.c