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On 10 April 2002 15:08, E. Abbink wrote: > I'm trying to solve a problem using mandatory locks but am having some > difficulty in doing so. (if there's a more appropriate place for > discussing this please ignore the rest of this post. pointers to that > place would be appreciated ;) ) > > my problem: > > when I lock a file with a mandatory write lock (ie. fcntl, +s-x bits and > mand mount option. for code see below) it is still possible: > > - for me to rm the file in question > - for the file to be read by an other process [snip] > lock.l_type = F_WRLCK ; <================ > lock.l_whence = SEEK_SET ; > lock.l_start = 0 ; > lock.l_len = 0 ; > lock.l_pid = 0 ; // ignored > > int err = fcntl (fd, F_SETLK, &lock) ; I know nothing about file locking in Unix, but it looks like you requested write lock, i.e. forbid writing to a file. Why are you surprised that reads are allowed? Probably someone else would comment on why rm is working, though... -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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