pmclog_procexec
PMCLOG_GET_PATHLEN(pathlen,evlen,pmclog_procexec);
recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA +
struct pmclog_procexec pl_x;