Macosx uses a different layout for struct flock.

[ktf]

The changes in #662, #814 break on macosx because apparently flock has a different layout there:

i.e. on mac:

struct flock {
        off_t   l_start;        /* starting offset */
        off_t   l_len;          /* len = 0 means until end of file */
        pid_t   l_pid;          /* lock owner */                                                                                                                                                                                                          
        short   l_type;         /* lock type: read/write, etc. */
        short   l_whence;       /* type of l_start */
};

vs on linux:

struct flock {
        short   l_type;
        short   l_whence;
        off_t   l_start;
        off_t   l_len;                                                                                                                                                                                                                                    
        pid_t   l_pid;
        __ARCH_FLOCK_PAD
};

this change adds an helper which takes care of the layout.

[cmsbuild]

A new Pull Request was created by @ktf (Giulio Eulisse) for CMSSW_7_0_X.

Macosx uses a different layout for struct flock.

It involves the following packages:

EventFilter/Utilities

@mommsen, @emeschi can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@ktf you are the release manager for this.

[ktf]

I'll by-pass this. It passes my tests at:

https://cmssdt.cern.ch/jenkins/job/Pull-Request-Integration/ARCHITECTURE=slc5_amd64_gcc481/496/console

Moan if you think this is wrong.