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Use F_GETLK to get the lock holder PID, this is more accurate than
reading the file contents: A conflicting process might not have
written its PID yet. Also, F_GETLK easily allows to do a retry if the
lock holder just died.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
One case needs a variable declared, so it can be compared to -1 and
then cast to size_t for comparison.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Mon Jul 1 08:00:29 UTC 2019 on sn-devel-184
Uses the core of CTDB's create_pidfile_context() for
pidfile_path_create(). pidfile_fd_close() is a subset of CTDB's
pidfile_context_destructor().
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Volker Lendecke <vl@samba.org>
This causes a race. If 2 callers to pidfile_create() both a find a
stale PID file using pidfile_pid(). The 1st may then return to
pidfile_create() and create a new PID file, which can then be unlinked
by the 2nd caller.
Consequently, PID file creation can not depend on creating the file,
so drop O_EXCL from the call to open().
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Volker Lendecke <vl@samba.org>
