Linus Torvalds wrote:
>Ehh.. I will bet you $10 USD that if libc allocates the next file
>descriptor on the first "malloc()" in user space (in order to use the
>semaphores for mm protection), programs _will_ break.
>
>You want to take the bet?
Good point. Speaking of which:
ioctl(fd, UIOCATTACHSEMA, ...);
seems to act like dup(fd) if fd was opened on "/dev/usemaclone"
(see drivers/sgi/char/usema.c). According to usema(7), this is
intended to help libraries implement semaphores.
Is this a bad coding? Should the kernel really support an ioctl()
that can silently allocate the next file descriptor? This seems
like asking for trouble. Or, maybe I just misunderstood something.
-
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/
This archive was generated by hypermail 2b29 : Mon Apr 23 2001 - 21:00:48 EST