I'm having trouble understanding the docs and annotations on flock(). I've
got a script that needs to overwrite a data file's contents without letting
Instance B of that script truncate the data file while Instance A is still
writing new content to it. How do other people do this? It seems to me
that if I fopen() in "w" or "w+" mode, then the file will be truncated
before it can be determined whether there's a lock already in effect or the
current instance can acquire a lock; but flock() requires a filepointer
argument, so don't I *have* to fopen the file before going to flock()? Or
should I fopen first in "r" mode, acquire the lock, then re-open in "w"
mode, counting on the lock to stay in effect even though it's a different
file pointer?
I'd also be grateful if someone could clarify the difference between
blocking and locking (i.e. "If you don't want flock() to block while
locking, add LOCK_NB (4 prior to PHP 4.0.1) to operation.").
TIA
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