Re: OT: why no file copy() libc/syscall ??
From: Trond Myklebust
Date: Tue Nov 18 2003 - 11:26:42 EST
>>>>> " " == Andi Kleen <ak@xxxxxxx> writes:
>> > That would be buggy because existing users of sendfile don't
>> > know about this and would silently only copy part of the file
>> > when a signal happens.
>>
>> That doesn't make sense. There aren't any existing users of
>> sendfile to copy files.
> [ignore the mail, it was an stuck mail queue]
> But note that arbitary changes in the signal handling would
> affect all users of sendfile, not just those that attempt to
> copy files or do other things that should be done in user
> space.
That 'change' is already in effect for people who mount their NFS
partitions with the "intr" or "soft" flags.
See the return value of generic_file_sendfile(): it already has the
read()/write-like semantics of returning number of bytes written if
non-zero, or the value of desc.error if not.
Cheers,
Trond
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