lock files or flock() - which does /bin/mail use?

[Ken Spagnolo]

The subject line says it all, really.  I am writing something that grabs
files out of /usr/spool/mail, so I need to lock them first.  The docs say
binmail puts lock files in /usr/spool/mail, but my experiments say it does
no such thing.  This implies flock() is used, right?  I don't really care,
but I need to be sure what the mechanism is so I do the same.

Anyone know for sure?  Thank you much.

==============================================================================
Ken Spagnolo, Systems Programmer, Comp.Ctr., Massey Univ, Palmerston Nth, N.Z.
CSnet/ACSnet/Internet: K.Spagnolo at massey.ac.nz       Phone: +64-63-69099 x8587
>From North America: K.Spagnolo%massey.ac.nz at relay.cs.net  New Zealand = GMT+12
==============================================================================