flock does not check the operation argument for validity

[bhaible]

The flock() function does not return an error code when the operation argument is invalid. In the attached sample program a shared and exclusive lock is requested - obviously nonsense, but the BeOS implementation does not reject it.

Expected output: -1 and the value of EINVAL Actual output: 0 0

flock() is not specified by POSIX, therefore one has to look at the manual pages of some systems, such as Linux

 http://www.kernel.org/doc/man-pages/online/pages/man2/flock.2.html

or NetBSD

 http://www.daemon-systems.org/man/flock.2.html

[bhaible]

test case

[axeld]

Thanks! The bug is gone with r28889.