cms-sw/cmssw — pull request #821 by ktf (2013-09-13 09:08:26+00:00)
Title: Macosx uses a different layout for struct flock.

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

i.e. on mac:

```C++
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:

```C++
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.